[ Upstream commit ba32679c

 ]

When trying to transmit to an unknown destination, the mesh code would
unconditionally transmit a HWMP PREQ even if HWMP is not the current
path selection algorithm.

Signed-off-by: Nicolas Cavallari <nicolas.cavallari@green-communications.fr>
Link: https://lore.kernel.org/r/20200305140409.12204-1-cavallar@lri.fr


Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

[ Upstream commit 394b6171 ]

When trying to rescan disks in petitboot shell, we hit the following
softlockup stacktrace:

Kernel panic - not syncing: System is deadlocked on memory
[  241.223394] CPU: 32 PID: 693 Comm: sh Not tainted 5.4.16-openpower1 #1
[  241.223406] Call Trace:
[  241.223415] [c0000003f07c3180] [c000000000493fc4] dump_stack+0xa4/0xd8 (unreliable)
[  241.223432] [c0000003f07c31c0] [c00000000007d4ac] panic+0x148/0x3cc
[  241.223446] [c0000003f07c3260] [c000000000114b10] out_of_memory+0x468/0x4c4
[  241.223461] [c0000003f07c3300] [c0000000001472b0] __alloc_pages_slowpath+0x594/0x6d8
[  241.223476] [c0000003f07c3420] [c00000000014757c] __alloc_pages_nodemask+0x188/0x1a4
[  241.223492] [c0000003f07c34a0] [c000000000153e10] alloc_pages_current+0xcc/0xd8
[  241.223508] [c0000003f07c34e0] [c0000000001577ac] alloc_slab_page+0x30/0x98
[  241.223524] [c0000003f07c3520] [c0000000001597fc] new_slab+0x138/0x40c
[  241.223538] [c0000003f07c35f0] [c00000000015b204] ___slab_alloc+0x1e4/0x404
[  241.223552] [c0000003f07c36c0] [c00000000015b450] __slab_alloc+0x2c/0x48
[  241.223566] [c0000003f07c36f0] [c00000000015b754] kmem_cache_alloc_node+0x9c/0x1b4
[  241.223582] [c0000003f07c3760] [c000000000218c48] blk_alloc_queue_node+0x34/0x270
[  241.223599] [c0000003f07c37b0] [c000000000226574] blk_mq_init_queue+0x2c/0x78
[  241.223615] [c0000003f07c37e0] [c0000000002ff710] scsi_mq_alloc_queue+0x28/0x70
[  241.223631] [c0000003f07c3810] [c0000000003005b8] scsi_alloc_sdev+0x184/0x264
[  241.223647] [c0000003f07c38a0] [c000000000300ba0] scsi_probe_and_add_lun+0x288/0xa3c
[  241.223663] [c0000003f07c3a00] [c000000000301768] __scsi_scan_target+0xcc/0x478
[  241.223679] [c0000003f07c3b20] [c000000000301c64] scsi_scan_channel.part.9+0x74/0x7c
[  241.223696] [c0000003f07c3b70] [c000000000301df4] scsi_scan_host_selected+0xe0/0x158
[  241.223712] [c0000003f07c3bd0] [c000000000303f04] store_scan+0x104/0x114
[  241.223727] [c0000003f07c3cb0] [c0000000002d5ac4] dev_attr_store+0x30/0x4c
[  241.223741] [c0000003f07c3cd0] [c0000000001dbc34] sysfs_kf_write+0x64/0x78
[  241.223756] [c0000003f07c3cf0] [c0000000001da858] kernfs_fop_write+0x170/0x1b8
[  241.223773] [c0000003f07c3d40] [c0000000001621fc] __vfs_write+0x34/0x60
[  241.223787] [c0000003f07c3d60] [c000000000163c2c] vfs_write+0xa8/0xcc
[  241.223802] [c0000003f07c3db0] [c000000000163df4] ksys_write+0x70/0xbc
[  241.223816] [c0000003f07c3e20] [c00000000000b40c] system_call+0x5c/0x68

As a part of the scan process Linux will allocate and configure a
scsi_device for each target to be scanned. If the device is not present,
then the scsi_device is torn down. As a part of scsi_device teardown a
workqueue item will be scheduled and the lockups we see are because there
are 250k workqueue items to be processed.  Accoding to the specification of
SIS-64 sas controller, max_channel should be decreased on SIS-64 adapters
to 4.

The patch fixes softlockup issue.

Thanks for Oliver Halloran's help with debugging and explanation!

Link: https://lore.kernel.org/r/1583510248-23672-1-git-send-email-wenxiong@linux.vnet.ibm.com


Signed-off-by: Wen Xiong <wenxiong@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

[ Upstream commit b281f7b9

 ]

Detect the presence of the A050385 erratum.

Signed-off-by: Madalin Bucur <madalin.bucur@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

[ Upstream commit b54d3900

 ]

The LS1043A SoC is affected by the A050385 erratum stating that
FMAN DMA read or writes under heavy traffic load may cause FMAN
internal resource leak thus stopping further packet processing.

Signed-off-by: Madalin Bucur <madalin.bucur@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

[ Upstream commit 26d5bb9e

 ]

FMAN DMA read or writes under heavy traffic load may cause FMAN
internal resource leak; thus stopping further packet processing.

The FMAN internal queue can overflow when FMAN splits single
read or write transactions into multiple smaller transactions
such that more than 17 AXI transactions are in flight from FMAN
to interconnect. When the FMAN internal queue overflows, it can
stall further packet processing. The issue can occur with any one
of the following three conditions:

  1. FMAN AXI transaction crosses 4K address boundary (Errata
     A010022)
  2. FMAN DMA address for an AXI transaction is not 16 byte
     aligned, i.e. the last 4 bits of an address are non-zero
  3. Scatter Gather (SG) frames have more than one SG buffer in
     the SG list and any one of the buffers, except the last
     buffer in the SG list has data size that is not a multiple
     of 16 bytes, i.e., other than 16, 32, 48, 64, etc.

With any one of the above three conditions present, there is
likelihood of stalled FMAN packet processing, especially under
stress with multiple ports injecting line-rate traffic.

To avoid situations that stall FMAN packet processing, all of the
above three conditions must be avoided; therefore, configure the
system with the following rules:

  1. Frame buffers must not span a 4KB address boundary, unless
     the frame start address is 256 byte aligned
  2. All FMAN DMA start addresses (for example, BMAN buffer
     address, FD[address] + FD[offset]) are 16B aligned
  3. SG table and buffer addresses are 16B aligned and the size
     of SG buffers are multiple of 16 bytes, except for the last
     SG buffer that can be of any size.

Additional workaround notes:
- Address alignment of 64 bytes is recommended for maximally
efficient system bus transactions (although 16 byte alignment is
sufficient to avoid the stall condition)
- To support frame sizes that are larger than 4K bytes, there are
two options:
  1. Large single buffer frames that span a 4KB page boundary can
     be converted into SG frames to avoid transaction splits at
     the 4KB boundary,
  2. Align the large single buffer to 256B address boundaries,
     ensure that the frame address plus offset is 256B aligned.
- If software generated SG frames have buffers that are unaligned
and with random non-multiple of 16 byte lengths, before
transmitting such frames via FMAN, frames will need to be copied
into a new single buffer or multiple buffer SG frame that is
compliant with the three rules listed above.

Signed-off-by: Madalin Bucur <madalin.bucur@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

[ Upstream commit 2e5383d7 ]

Older (and maybe current) versions of systemd set release_agent to "" when
shutting down, but do not set notify_on_release to 0.

Since 64e90a8a

 ("Introduce STATIC_USERMODEHELPER to mediate
call_usermodehelper()"), we filter out such calls when the user mode helper
path is "". However, when used in conjunction with an actual (i.e. non "")
STATIC_USERMODEHELPER, the path is never "", so the real usermode helper
will be called with argv[0] == "".

Let's avoid this by not invoking the release_agent when it is "".

Signed-off-by: Tycho Andersen <tycho@tycho.ws>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

[ Upstream commit 209c65b6

 ]

When registers a phy_device successful, should terminate the loop
or the phy_device would be registered in other addr. If there are
multiple PHYs without reg properties, it will go wrong.

Signed-off-by: Dajun Jin <adajunjin@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

[ Upstream commit 2de7fb60 ]

Building cpupower with -fno-common in CFLAGS results in errors due to
multiple definitions of the 'cpu_count' and 'start_time' variables.

./utils/idle_monitor/snb_idle.o:./utils/idle_monitor/cpupower-monitor.h:28:
multiple definition of `cpu_count';
./utils/idle_monitor/nhm_idle.o:./utils/idle_monitor/cpupower-monitor.h:28:
first defined here
...
./utils/idle_monitor/cpuidle_sysfs.o:./utils/idle_monitor/cpuidle_sysfs.c:22:
multiple definition of `start_time';
./utils/idle_monitor/amd_fam14h_idle.o:./utils/idle_monitor/amd_fam14h_idle.c:85:
first defined here

The -fno-common option will be enabled by default in GCC 10.

Bug: https://bugs.gentoo.org/707462


Signed-off-by: Mike Gilbert <floppym@gentoo.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

[ Upstream commit db8dd969 ]

if seq_file .next fuction does not change position index,
read after some lseek can generate unexpected output.

 # mount | grep cgroup
 # dd if=/mnt/cgroup.procs bs=1  # normal output
...
1294
1295
1296
1304
1382
584+0 records in
584+0 records out
584 bytes copied

dd: /mnt/cgroup.procs: cannot skip to specified offset
83  <<< generates end of last line
1383  <<< ... and whole last line once again
0+1 records in
0+1 records out
8 bytes copied

dd: /mnt/cgroup.procs: cannot skip to specified offset
1386  <<< generates last line anyway
0+1 records in
0+1 records out
5 bytes copied

https://bugzilla.kernel.org/show_bug.cgi?id=206283


Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

[ Upstream commit 28d35bcd ]

When an MTU update with PMTU smaller than net.ipv4.route.min_pmtu is
received, we must clamp its value. However, we can receive a PMTU
exception with PMTU < old_mtu < ip_rt_min_pmtu, which would lead to an
increase in PMTU.

To fix this, take the smallest of the old MTU and ip_rt_min_pmtu.

Before this patch, in case of an update, the exception's MTU would
always change. Now, an exception can have only its lock flag updated,
but not the MTU, so we need to add a check on locking to the following
"is this exception getting updated, or close to expiring?" test.

Fixes: d52e5a7e

 ("ipv4: lock mtu in fnhe when received PMTU < net.ipv4.route.min_pmtu")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

[ Upstream commit 09e91dbe ]

The hsr module has been supporting the list and status command.
(HSR_C_GET_NODE_LIST and HSR_C_GET_NODE_STATUS)
These commands send node information to the user-space via generic netlink.
But, in the non-init_net namespace, these commands are not allowed
because .netnsok flag is false.
So, there is no way to get node information in the non-init_net namespace.

Fixes: f421436a

 ("net/hsr: Add support for the High-availability Seamless Redundancy protocol (HSRv0)")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

[ Upstream commit ca19c70f ]

The hsr_get_node_list() is to send node addresses to the userspace.
If there are so many nodes, it could fail because of buffer size.
In order to avoid this failure, the restart routine is added.

Fixes: f421436a

 ("net/hsr: Add support for the High-availability Seamless Redundancy protocol (HSRv0)")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

[ Upstream commit 173756b8 ]

hsr_get_node_{list/status}() are not under rtnl_lock() because
they are callback functions of generic netlink.
But they use __dev_get_by_index() without rtnl_lock().
So, it would use unsafe data.
In order to fix it, rcu_read_lock() and dev_get_by_index_rcu()
are used instead of __dev_get_by_index().

Fixes: f421436a

 ("net/hsr: Add support for the High-availability Seamless Redundancy protocol (HSRv0)")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

[ Upstream commit 384d91c2 ]

gro_cells_init() returns error if memory allocation is failed.
But the vxlan module doesn't check the return value of gro_cells_init().

Fixes: 58ce31cc

 ("vxlan: GRO support at tunnel layer")`
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

[ Upstream commit 22259471 ]

Andrew reported:

After a number of network port link up/down changes, sometimes the switch
port gets stuck in a state where it thinks it is still transmitting packets
but the cpu port is not actually transmitting anymore. In this state you
will see a message on the console
"mtk_soc_eth 1e100000.ethernet eth0: transmit timed out" and the Tx counter
in ifconfig will be incrementing on virtual port, but not incrementing on
cpu port.

The issue is that MAC TX/RX status has no impact on the link status or
queue manager of the switch. So the queue manager just queues up packets
of a disabled port and sends out pause frames when the queue is full.

Change the LINK bit to reflect the link status.

Fixes: b8f126a8

 ("net-next: dsa: add dsa support for Mediatek MT7530 switch")
Reported-by: Andrew Smith <andrew.smith@digi.com>
Signed-off-by: René van Dorst <opensource@vdorst.com>
Reviewed-by: Vivien Didelot <vivien.didelot@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

[ Upstream commit 62d4073e ]

The allocated ieee_ets structure goes out of scope without being freed,
leaking memory. Appropriate result codes should be returned so that
callers do not rely on invalid data passed by reference.

Also cache the ETS config retrieved from the device so that it doesn't
need to be freed. The balance of the code was clearly written with the
intent of having the results of querying the hardware cached in the
device structure. The commensurate store was evidently missed though.

Fixes: 7df4ae9f

 ("bnxt_en: Implement DCBNL to support host-based DCBX.")
Signed-off-by: Edwin Peer <edwin.peer@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

[ Upstream commit 2091a3d4 ]

As the description before netdev_run_todo, we cannot call free_netdev
before rtnl_unlock, fix it by reorder the code.

This patch is a 1:1 copy of upstream slip.c commit f596c870


("slip: not call free_netdev before rtnl_unlock in slip_open").

Reported-by: yangerkun <yangerkun@huawei.com>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

[ Upstream commit 0dcdf9f6 ]

The nci_conn_max_data_pkt_payload_size() function sometimes returns
-EPROTO so "max_size" needs to be signed for the error handling to
work.  We can make "payload_size" an int as well.

Fixes: a06347c0

 ("NFC: Add Intel Fields Peak NFC solution driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

[ Upstream commit 9de9aa48 ]

Make sure we clean up devicetree related configuration
also when clock init fails.

Fixes: fecd4d7e

 ("net: stmmac: dwmac-rk: Add integrated PHY support")
Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

[ Upstream commit 0d1c3530 ]

In commit 599be01e

 ("net_sched: fix an OOB access in cls_tcindex")
I moved cp->hash calculation before the first
tcindex_alloc_perfect_hash(), but cp->alloc_hash is left untouched.
This difference could lead to another out of bound access.

cp->alloc_hash should always be the size allocated, we should
update it after this tcindex_alloc_perfect_hash().

Reported-and-tested-by:  <syzbot+dcc34d54d68ef7d2d53d@syzkaller.appspotmail.com>
Reported-and-tested-by:  <syzbot+c72da7b9ed57cde6fca2@syzkaller.appspotmail.com>
Fixes: 599be01e

 ("net_sched: fix an OOB access in cls_tcindex")
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

[ Upstream commit ef299cc3

 ]

route4_change() allocates a new filter and copies values from
the old one. After the new filter is inserted into the hash
table, the old filter should be removed and freed, as the final
step of the update.

However, the current code mistakenly removes the new one. This
looks apparently wrong to me, and it causes double "free" and
use-after-free too, as reported by syzbot.

Reported-and-tested-by:  <syzbot+f9b32aaacd60305d9687@syzkaller.appspotmail.com>
Reported-and-tested-by:  <syzbot+2f8c233f131943d6056d@syzkaller.appspotmail.com>
Reported-and-tested-by:  <syzbot+9c2df9fd5e9445b74e01@syzkaller.appspotmail.com>
Fixes: 1109c005

 ("net: sched: RCU cls_route")
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Jiri Pirko <jiri@resnulli.us>
Cc: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

[ Upstream commit 12a5ba5a

 ]

ASKEY WWHC050 is a mcie LTE modem.
The oem configuration states:

T:  Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#=  2 Spd=480  MxCh= 0
D:  Ver= 2.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=1690 ProdID=7588 Rev=ff.ff
S:  Manufacturer=Android
S:  Product=Android
S:  SerialNumber=813f0eef6e6e
C:* #Ifs= 6 Cfg#= 1 Atr=80 MxPwr=500mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
E:  Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 1 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=42 Prot=01 Driver=(none)
E:  Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
E:  Ad=84(I) Atr=03(Int.) MxPS=  10 Ivl=32ms
E:  Ad=83(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=03(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
E:  Ad=86(I) Atr=03(Int.) MxPS=  10 Ivl=32ms
E:  Ad=85(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=04(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 4 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=qmi_wwan
E:  Ad=88(I) Atr=03(Int.) MxPS=   8 Ivl=32ms
E:  Ad=87(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=05(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 5 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=(none)
E:  Ad=89(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=06(O) Atr=02(Bulk) MxPS= 512 Ivl=125us

Tested on openwrt distribution.

Signed-off-by: Cezary Jackiewicz <cezary@eko.one.pl>
Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>
Acked-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

[ Upstream commit 61fad681 ]

PACKET_RX_RING can cause multiple writers to access the same slot if a
fast writer wraps the ring while a slow writer is still copying. This
is particularly likely with few, large, slots (e.g., GSO packets).

Synchronize kernel thread ownership of rx ring slots with a bitmap.

Writers acquire a slot race-free by testing tp_status TP_STATUS_KERNEL
while holding the sk receive queue lock. They release this lock before
copying and set tp_status to TP_STATUS_USER to release to userspace
when done. During copying, another writer may take the lock, also see
TP_STATUS_KERNEL, and start writing to the same slot.

Introduce a new rx_owner_map bitmap with a bit per slot. To acquire a
slot, test and set with the lock held. To release race-free, update
tp_status and owner bit as a transaction, so take the lock again.

This is the one of a variety of discussed options (see Link below):

* instead of a shadow ring, embed the data in the slot itself, such as
in tp_padding. But any test for this field may match a value left by
userspace, causing deadlock.

* avoid the lock on release. This leaves a small race if releasing the
shadow slot before setting TP_STATUS_USER. The below reproducer showed
that this race is not academic. If releasing the slot after tp_status,
the race is more subtle. See the first link for details.

* add a new tp_status TP_KERNEL_OWNED to avoid the transactional store
of two fields. But, legacy applications may interpret all non-zero
tp_status as owned by the user. As libpcap does. So this is possible
only opt-in by newer processes. It can be added as an optional mode.

* embed the struct at the tail of pg_vec to avoid extra allocation.
The implementation proved no less complex than a separate field.

The additional locking cost on release adds contention, no different
than scaling on multicore or multiqueue h/w. In practice, below
reproducer nor small packet tcpdump showed a noticeable change in
perf report in cycles spent in spinlock. Where contention is
problematic, packet sockets support mitigation through PACKET_FANOUT.
And we can consider adding opt-in state TP_KERNEL_OWNED.

Easy to reproduce by running multiple netperf or similar TCP_STREAM
flows concurrently with `tcpdump -B 129 -n greater 60000`.

Based on an earlier patchset by Jon Rosen. See links below.

I believe this issue goes back to the introduction of tpacket_rcv,
which predates git history.

Link: https://www.mail-archive.com/netdev@vger.kernel.org/msg237222.html


Suggested-by: Jon Rosen <jrosen@cisco.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Jon Rosen <jrosen@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

[ Upstream commit 065fd83e ]

For the case where the last mvneta_poll did not process all
RX packets, we need to xor the pp->cause_rx_tx or port->cause_rx_tx
before claculating the rx_queue.

Fixes: 2dcf75e2

 ("net: mvneta: Associate RX queues with each CPU")
Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

[ Upstream commit 0e62f543 ]

When both the switch and the bridge are learning about new addresses,
switch ports attached to the bridge would see duplicate ARP frames
because both entities would attempt to send them.

Fixes: 5037d532

 ("net: dsa: add Broadcom tag RX/TX handler")
Reported-by: Maxime Bizon <mbizon@freebox.fr>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Vivien Didelot <vivien.didelot@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

[ Upstream commit b06d072c

 ]

Only attach macsec to ethernet devices.

Syzbot was able to trigger a KMSAN warning in macsec_handle_frame
by attaching to a phonet device.

Macvlan has a similar check in macvlan_port_create.

v1->v2
  - fix commit message typo

Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

[ Upstream commit 3a303cfd

 ]

The port->hsr is used in the hsr_handle_frame(), which is a
callback of rx_handler.
hsr master and slaves are initialized in hsr_add_port().
This function initializes several pointers, which includes port->hsr after
registering rx_handler.
So, in the rx_handler routine, un-initialized pointer would be used.
In order to fix this, pointers should be initialized before
registering rx_handler.

Test commands:
    ip netns del left
    ip netns del right
    modprobe -rv veth
    modprobe -rv hsr
    killall ping
    modprobe hsr
    ip netns add left
    ip netns add right
    ip link add veth0 type veth peer name veth1
    ip link add veth2 type veth peer name veth3
    ip link add veth4 type veth peer name veth5
    ip link set veth1 netns left
    ip link set veth3 netns right
    ip link set veth4 netns left
    ip link set veth5 netns right
    ip link set veth0 up
    ip link set veth2 up
    ip link set veth0 address fc:00:00:00:00:01
    ip link set veth2 address fc:00:00:00:00:02
    ip netns exec left ip link set veth1 up
    ip netns exec left ip link set veth4 up
    ip netns exec right ip link set veth3 up
    ip netns exec right ip link set veth5 up
    ip link add hsr0 type hsr slave1 veth0 slave2 veth2
    ip a a 192.168.100.1/24 dev hsr0
    ip link set hsr0 up
    ip netns exec left ip link add hsr1 type hsr slave1 veth1 slave2 veth4
    ip netns exec left ip a a 192.168.100.2/24 dev hsr1
    ip netns exec left ip link set hsr1 up
    ip netns exec left ip n a 192.168.100.1 dev hsr1 lladdr \
	    fc:00:00:00:00:01 nud permanent
    ip netns exec left ip n r 192.168.100.1 dev hsr1 lladdr \
	    fc:00:00:00:00:01 nud permanent
    for i in {1..100}
    do
        ip netns exec left ping 192.168.100.1 &
    done
    ip netns exec left hping3 192.168.100.1 -2 --flood &
    ip netns exec right ip link add hsr2 type hsr slave1 veth3 slave2 veth5
    ip netns exec right ip a a 192.168.100.3/24 dev hsr2
    ip netns exec right ip link set hsr2 up
    ip netns exec right ip n a 192.168.100.1 dev hsr2 lladdr \
	    fc:00:00:00:00:02 nud permanent
    ip netns exec right ip n r 192.168.100.1 dev hsr2 lladdr \
	    fc:00:00:00:00:02 nud permanent
    for i in {1..100}
    do
        ip netns exec right ping 192.168.100.1 &
    done
    ip netns exec right hping3 192.168.100.1 -2 --flood &
    while :
    do
        ip link add hsr0 type hsr slave1 veth0 slave2 veth2
	ip a a 192.168.100.1/24 dev hsr0
	ip link set hsr0 up
	ip link del hsr0
    done

Splat looks like:
[  120.954938][    C0] general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1]I
[  120.957761][    C0] KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
[  120.959064][    C0] CPU: 0 PID: 1511 Comm: hping3 Not tainted 5.6.0-rc5+ #460
[  120.960054][    C0] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006
[  120.962261][    C0] RIP: 0010:hsr_addr_is_self+0x65/0x2a0 [hsr]
[  120.963149][    C0] Code: 44 24 18 70 73 2f c0 48 c1 eb 03 48 8d 04 13 c7 00 f1 f1 f1 f1 c7 40 04 00 f2 f2 f2 4
[  120.966277][    C0] RSP: 0018:ffff8880d9c09af0 EFLAGS: 00010206
[  120.967293][    C0] RAX: 0000000000000006 RBX: 1ffff1101b38135f RCX: 0000000000000000
[  120.968516][    C0] RDX: dffffc0000000000 RSI: ffff8880d17cb208 RDI: 0000000000000000
[  120.969718][    C0] RBP: 0000000000000030 R08: ffffed101b3c0e3c R09: 0000000000000001
[  120.972203][    C0] R10: 0000000000000001 R11: ffffed101b3c0e3b R12: 0000000000000000
[  120.973379][    C0] R13: ffff8880aaf80100 R14: ffff8880aaf800f2 R15: ffff8880aaf80040
[  120.974410][    C0] FS:  00007f58e693f740(0000) GS:ffff8880d9c00000(0000) knlGS:0000000000000000
[  120.979794][    C0] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  120.980773][    C0] CR2: 00007ffcb8b38f29 CR3: 00000000afe8e001 CR4: 00000000000606f0
[  120.981945][    C0] Call Trace:
[  120.982411][    C0]  <IRQ>
[  120.982848][    C0]  ? hsr_add_node+0x8c0/0x8c0 [hsr]
[  120.983522][    C0]  ? rcu_read_lock_held+0x90/0xa0
[  120.984159][    C0]  ? rcu_read_lock_sched_held+0xc0/0xc0
[  120.984944][    C0]  hsr_handle_frame+0x1db/0x4e0 [hsr]
[  120.985597][    C0]  ? hsr_nl_nodedown+0x2b0/0x2b0 [hsr]
[  120.986289][    C0]  __netif_receive_skb_core+0x6bf/0x3170
[  120.992513][    C0]  ? check_chain_key+0x236/0x5d0
[  120.993223][    C0]  ? do_xdp_generic+0x1460/0x1460
[  120.993875][    C0]  ? register_lock_class+0x14d0/0x14d0
[  120.994609][    C0]  ? __netif_receive_skb_one_core+0x8d/0x160
[  120.995377][    C0]  __netif_receive_skb_one_core+0x8d/0x160
[  120.996204][    C0]  ? __netif_receive_skb_core+0x3170/0x3170
[ ... ]

Reported-by:  <syzbot+fcf5dd39282ceb27108d@syzkaller.appspotmail.com>
Fixes: c5a75911

 ("net/hsr: Use list_head (and rcu) instead of array for slave devices.")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 9765635b upstream.

This reverts commit:

c54c7374

 ("drm/dp_mst: Skip validating ports during destruction, just ref")

ugh.

In drm_dp_destroy_connector_work(), we have a pretty good chance of
freeing the actual struct drm_dp_mst_port. However, after destroying
things we send a hotplug through (*mgr->cbs->hotplug)(mgr) which is
where the problems start.

For i915, this calls all the way down to the fbcon probing helpers,
which start trying to access the port in a modeset.

[   45.062001] ==================================================================
[   45.062112] BUG: KASAN: use-after-free in ex_handler_refcount+0x146/0x180
[   45.062196] Write of size 4 at addr ffff8882b4b70968 by task kworker/3:1/53

[   45.062325] CPU: 3 PID: 53 Comm: kworker/3:1 Kdump: loaded Tainted: G           O      4.20.0-rc4Lyude-Test+ #3
[   45.062442] Hardware name: LENOVO 20BWS1KY00/20BWS1KY00, BIOS JBET71WW (1.35 ) 09/14/2018
[   45.062554] Workqueue: events drm_dp_destroy_connector_work [drm_kms_helper]
[   45.062641] Call Trace:
[   45.062685]  dump_stack+0xbd/0x15a
[   45.062735]  ? dump_stack_print_info.cold.0+0x1b/0x1b
[   45.062801]  ? printk+0x9f/0xc5
[   45.062847]  ? kmsg_dump_rewind_nolock+0xe4/0xe4
[   45.062909]  ? ex_handler_refcount+0x146/0x180
[   45.062970]  print_address_description+0x71/0x239
[   45.063036]  ? ex_handler_refcount+0x146/0x180
[   45.063095]  kasan_report.cold.5+0x242/0x30b
[   45.063155]  __asan_report_store4_noabort+0x1c/0x20
[   45.063313]  ex_handler_refcount+0x146/0x180
[   45.063371]  ? ex_handler_clear_fs+0xb0/0xb0
[   45.063428]  fixup_exception+0x98/0xd7
[   45.063484]  ? raw_notifier_call_chain+0x20/0x20
[   45.063548]  do_trap+0x6d/0x210
[   45.063605]  ? _GLOBAL__sub_I_65535_1_drm_dp_aux_unregister_devnode+0x2f/0x1c6 [drm_kms_helper]
[   45.063732]  do_error_trap+0xc0/0x170
[   45.063802]  ? _GLOBAL__sub_I_65535_1_drm_dp_aux_unregister_devnode+0x2f/0x1c6 [drm_kms_helper]
[   45.063929]  do_invalid_op+0x3b/0x50
[   45.063997]  ? _GLOBAL__sub_I_65535_1_drm_dp_aux_unregister_devnode+0x2f/0x1c6 [drm_kms_helper]
[   45.064103]  invalid_op+0x14/0x20
[   45.064162] RIP: 0010:_GLOBAL__sub_I_65535_1_drm_dp_aux_unregister_devnode+0x2f/0x1c6 [drm_kms_helper]
[   45.064274] Code: 00 48 c7 c7 80 fe 53 a0 48 89 e5 e8 5b 6f 26 e1 5d c3 48 8d 0e 0f 0b 48 8d 0b 0f 0b 48 8d 0f 0f 0b 48 8d 0f 0f 0b 49 8d 4d 00 <0f> 0b 49 8d 0e 0f 0b 48 8d 08 0f 0b 49 8d 4d 00 0f 0b 48 8d 0b 0f
[   45.064569] RSP: 0018:ffff8882b789ee10 EFLAGS: 00010282
[   45.064637] RAX: ffff8882af47ae70 RBX: ffff8882af47aa60 RCX: ffff8882b4b70968
[   45.064723] RDX: ffff8882af47ae70 RSI: 0000000000000008 RDI: ffff8882b788bdb8
[   45.064808] RBP: ffff8882b789ee28 R08: ffffed1056f13db4 R09: ffffed1056f13db3
[   45.064894] R10: ffffed1056f13db3 R11: ffff8882b789ed9f R12: ffff8882af47ad28
[   45.064980] R13: ffff8882b4b70968 R14: ffff8882acd86728 R15: ffff8882b4b75dc8
[   45.065084]  drm_dp_mst_reset_vcpi_slots+0x12/0x80 [drm_kms_helper]
[   45.065225]  intel_mst_disable_dp+0xda/0x180 [i915]
[   45.065361]  intel_encoders_disable.isra.107+0x197/0x310 [i915]
[   45.065498]  haswell_crtc_disable+0xbe/0x400 [i915]
[   45.065622]  ? i9xx_disable_plane+0x1c0/0x3e0 [i915]
[   45.065750]  intel_atomic_commit_tail+0x74e/0x3e60 [i915]
[   45.065884]  ? intel_pre_plane_update+0xbc0/0xbc0 [i915]
[   45.065968]  ? drm_atomic_helper_swap_state+0x88b/0x1d90 [drm_kms_helper]
[   45.066054]  ? kasan_check_write+0x14/0x20
[   45.066165]  ? i915_gem_track_fb+0x13a/0x330 [i915]
[   45.066277]  ? i915_sw_fence_complete+0xe9/0x140 [i915]
[   45.066406]  ? __i915_sw_fence_complete+0xc50/0xc50 [i915]
[   45.066540]  intel_atomic_commit+0x72e/0xef0 [i915]
[   45.066635]  ? drm_dev_dbg+0x200/0x200 [drm]
[   45.066764]  ? intel_atomic_commit_tail+0x3e60/0x3e60 [i915]
[   45.066898]  ? intel_atomic_commit_tail+0x3e60/0x3e60 [i915]
[   45.067001]  drm_atomic_commit+0xc4/0xf0 [drm]
[   45.067074]  restore_fbdev_mode_atomic+0x562/0x780 [drm_kms_helper]
[   45.067166]  ? drm_fb_helper_debug_leave+0x690/0x690 [drm_kms_helper]
[   45.067249]  ? kasan_check_read+0x11/0x20
[   45.067324]  restore_fbdev_mode+0x127/0x4b0 [drm_kms_helper]
[   45.067364]  ? kasan_check_read+0x11/0x20
[   45.067406]  drm_fb_helper_restore_fbdev_mode_unlocked+0x164/0x200 [drm_kms_helper]
[   45.067462]  ? drm_fb_helper_hotplug_event+0x30/0x30 [drm_kms_helper]
[   45.067508]  ? kasan_check_write+0x14/0x20
[   45.070360]  ? mutex_unlock+0x22/0x40
[   45.073748]  drm_fb_helper_set_par+0xb2/0xf0 [drm_kms_helper]
[   45.075846]  drm_fb_helper_hotplug_event.part.33+0x1cd/0x290 [drm_kms_helper]
[   45.078088]  drm_fb_helper_hotplug_event+0x1c/0x30 [drm_kms_helper]
[   45.082614]  intel_fbdev_output_poll_changed+0x9f/0x140 [i915]
[   45.087069]  drm_kms_helper_hotplug_event+0x67/0x90 [drm_kms_helper]
[   45.089319]  intel_dp_mst_hotplug+0x37/0x50 [i915]
[   45.091496]  drm_dp_destroy_connector_work+0x510/0x6f0 [drm_kms_helper]
[   45.093675]  ? drm_dp_update_payload_part1+0x1220/0x1220 [drm_kms_helper]
[   45.095851]  ? kasan_check_write+0x14/0x20
[   45.098473]  ? kasan_check_read+0x11/0x20
[   45.101155]  ? strscpy+0x17c/0x530
[   45.103808]  ? __switch_to_asm+0x34/0x70
[   45.106456]  ? syscall_return_via_sysret+0xf/0x7f
[   45.109711]  ? read_word_at_a_time+0x20/0x20
[   45.113138]  ? __switch_to_asm+0x40/0x70
[   45.116529]  ? __switch_to_asm+0x34/0x70
[   45.119891]  ? __switch_to_asm+0x40/0x70
[   45.123224]  ? __switch_to_asm+0x34/0x70
[   45.126540]  ? __switch_to_asm+0x34/0x70
[   45.129824]  process_one_work+0x88d/0x15d0
[   45.133172]  ? pool_mayday_timeout+0x850/0x850
[   45.136459]  ? pci_mmcfg_check_reserved+0x110/0x128
[   45.139739]  ? wake_q_add+0xb0/0xb0
[   45.143010]  ? check_preempt_wakeup+0x652/0x1050
[   45.146304]  ? worker_enter_idle+0x29e/0x740
[   45.149589]  ? __schedule+0x1ec0/0x1ec0
[   45.152937]  ? kasan_check_read+0x11/0x20
[   45.156179]  ? _raw_spin_lock_irq+0xa3/0x130
[   45.159382]  ? _raw_read_unlock_irqrestore+0x30/0x30
[   45.162542]  ? kasan_check_write+0x14/0x20
[   45.165657]  worker_thread+0x1a5/0x1470
[   45.168725]  ? set_load_weight+0x2e0/0x2e0
[   45.171755]  ? process_one_work+0x15d0/0x15d0
[   45.174806]  ? __switch_to_asm+0x34/0x70
[   45.177645]  ? __switch_to_asm+0x40/0x70
[   45.180323]  ? __switch_to_asm+0x34/0x70
[   45.182936]  ? __switch_to_asm+0x40/0x70
[   45.185539]  ? __switch_to_asm+0x34/0x70
[   45.188100]  ? __switch_to_asm+0x40/0x70
[   45.190628]  ? __schedule+0x7d4/0x1ec0
[   45.193143]  ? save_stack+0xa9/0xd0
[   45.195632]  ? kasan_check_write+0x10/0x20
[   45.198162]  ? kasan_kmalloc+0xc4/0xe0
[   45.200609]  ? kmem_cache_alloc_trace+0xdd/0x190
[   45.203046]  ? kthread+0x9f/0x3b0
[   45.205470]  ? ret_from_fork+0x35/0x40
[   45.207876]  ? unwind_next_frame+0x43/0x50
[   45.210273]  ? __save_stack_trace+0x82/0x100
[   45.212658]  ? deactivate_slab.isra.67+0x3d4/0x580
[   45.215026]  ? default_wake_function+0x35/0x50
[   45.217399]  ? kasan_check_read+0x11/0x20
[   45.219825]  ? _raw_spin_lock_irqsave+0xae/0x140
[   45.222174]  ? __lock_text_start+0x8/0x8
[   45.224521]  ? replenish_dl_entity.cold.62+0x4f/0x4f
[   45.226868]  ? __kthread_parkme+0x87/0xf0
[   45.229200]  kthread+0x2f7/0x3b0
[   45.231557]  ? process_one_work+0x15d0/0x15d0
[   45.233923]  ? kthread_park+0x120/0x120
[   45.236249]  ret_from_fork+0x35/0x40

[   45.240875] Allocated by task 242:
[   45.243136]  save_stack+0x43/0xd0
[   45.245385]  kasan_kmalloc+0xc4/0xe0
[   45.247597]  kmem_cache_alloc_trace+0xdd/0x190
[   45.249793]  drm_dp_add_port+0x1e0/0x2170 [drm_kms_helper]
[   45.252000]  drm_dp_send_link_address+0x4a7/0x740 [drm_kms_helper]
[   45.254389]  drm_dp_check_and_send_link_address+0x1a7/0x210 [drm_kms_helper]
[   45.256803]  drm_dp_mst_link_probe_work+0x6f/0xb0 [drm_kms_helper]
[   45.259200]  process_one_work+0x88d/0x15d0
[   45.261597]  worker_thread+0x1a5/0x1470
[   45.264038]  kthread+0x2f7/0x3b0
[   45.266371]  ret_from_fork+0x35/0x40

[   45.270937] Freed by task 53:
[   45.273170]  save_stack+0x43/0xd0
[   45.275382]  __kasan_slab_free+0x139/0x190
[   45.277604]  kasan_slab_free+0xe/0x10
[   45.279826]  kfree+0x99/0x1b0
[   45.282044]  drm_dp_free_mst_port+0x4a/0x60 [drm_kms_helper]
[   45.284330]  drm_dp_destroy_connector_work+0x43e/0x6f0 [drm_kms_helper]
[   45.286660]  process_one_work+0x88d/0x15d0
[   45.288934]  worker_thread+0x1a5/0x1470
[   45.291231]  kthread+0x2f7/0x3b0
[   45.293547]  ret_from_fork+0x35/0x40

[   45.298206] The buggy address belongs to the object at ffff8882b4b70968
                which belongs to the cache kmalloc-2k of size 2048
[   45.303047] The buggy address is located 0 bytes inside of
                2048-byte region [ffff8882b4b70968, ffff8882b4b71168)
[   45.308010] The buggy address belongs to the page:
[   45.310477] page:ffffea000ad2dc00 count:1 mapcount:0 mapping:ffff8882c080cf40 index:0x0 compound_mapcount: 0
[   45.313051] flags: 0x8000000000010200(slab|head)
[   45.315635] raw: 8000000000010200 ffffea000aac2808 ffffea000abe8608 ffff8882c080cf40
[   45.318300] raw: 0000000000000000 00000000000d000d 00000001ffffffff 0000000000000000
[   45.320966] page dumped because: kasan: bad access detected

[   45.326312] Memory state around the buggy address:
[   45.329085]  ffff8882b4b70800: fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   45.331845]  ffff8882b4b70880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   45.334584] >ffff8882b4b70900: fc fc fc fc fc fc fc fc fc fc fc fc fc fb fb fb
[   45.337302]                                                           ^
[   45.340061]  ffff8882b4b70980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   45.342910]  ffff8882b4b70a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   45.345748] ==================================================================

So, this definitely isn't a fix that we want. This being said; there's
no real easy fix for this problem because of some of the catch-22's of
the MST helpers current design. For starters; we always need to validate
a port with drm_dp_get_validated_port_ref(), but validation relies on
the lifetime of the port in the actual topology. So once the port is
gone, it can't be validated again.

If we were to try to make the payload helpers not use port validation,
then we'd cause another problem: if the port isn't validated, it could
be freed and we'd just start causing more KASAN issues. There are
already hacks that attempt to workaround this in
drm_dp_mst_destroy_connector_work() by re-initializing the kref so that
it can be used again and it's memory can be freed once the VCPI helpers
finish removing the port's respective payloads. But none of these really
do anything helpful since the port still can't be validated since it's
gone from the topology. Also, that workaround is immensely confusing to
read through.

What really needs to be done in order to fix this is to teach DRM how to
track the lifetime of the structs for MST ports and branch devices
separately from their lifetime in the actual topology. Simply put; this
means having two different krefs-one that removes the port/branch device
from the topology, and one that finally calls kfree(). This would let us
simplify things, since we'd now be able to keep ports around without
having to keep them in the topology at the same time, which is exactly
what we need in order to teach our VCPI helpers to only validate ports
when it's actually necessary without running the risk of trying to use
unallocated memory.

Such a fix is on it's way, but for now let's play it safe and just
revert this. If this bug has been around for well over a year, we can
wait a little while to get an actual proper fix here.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Fixes: c54c7374

 ("drm/dp_mst: Skip validating ports during destruction, just ref")
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Sean Paul <sean@poorly.run>
Cc: Jerry Zuo <Jerry.Zuo@amd.com>
Cc: Harry Wentland <Harry.Wentland@amd.com>
Cc: stable@vger.kernel.org # v4.6+
Acked-by: Sean Paul <sean@poorly.run>
Link: https://patchwork.freedesktop.org/patch/msgid/20181128210005.24434-1-lyude@redhat.com


Cc: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit ae62cf5e upstream.

Newer GCC warns about possible truncations of two generated path names as
we're concatenating the configurable sysfs and debugfs path prefixes
with a filename and placing the results in buffers of the same size as
the maximum length of the prefixes.

	snprintf(d->name, MAX_STR_LEN, "gb_loopback%u", dev_id);

	snprintf(d->sysfs_entry, MAX_SYSFS_PATH, "%s%s/",
		 t->sysfs_prefix, d->name);

	snprintf(d->debugfs_entry, MAX_SYSFS_PATH, "%sraw_latency_%s",
		 t->debugfs_prefix, d->name);

Fix this by separating the maximum path length from the maximum prefix
length and reducing the latter enough to fit the generated strings.

Note that we also need to reduce the device-name buffer size as GCC
isn't smart enough to figure out that we ever only used MAX_STR_LEN
bytes of it.

Fixes: 6b0658f6

 ("greybus: tools: Add tools directory to greybus repo and add loopback")
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20200312110151.22028-4-johan@kernel.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit f1602383 upstream.

Newer GCC warns about a possible truncation of a generated sysfs path
name as we're concatenating a directory path with a file name and
placing the result in a buffer that is half the size of the maximum
length of the directory path (which is user controlled).

loopback_test.c: In function 'open_poll_files':
loopback_test.c:651:31: warning: '%s' directive output may be truncated writing up to 511 bytes into a region of size 255 [-Wformat-truncation=]
  651 |   snprintf(buf, sizeof(buf), "%s%s", dev->sysfs_entry, "iteration_count");
      |                               ^~
loopback_test.c:651:3: note: 'snprintf' output between 16 and 527 bytes into a destination of size 255
  651 |   snprintf(buf, sizeof(buf), "%s%s", dev->sysfs_entry, "iteration_count");
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Fix this by making sure the buffer is large enough the concatenated
strings.

Fixes: 6b0658f6 ("greybus: tools: Add tools directory to greybus repo and add loopback")
Fixes: 9250c0ee

 ("greybus: Loopback_test: use poll instead of inotify")
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20200312110151.22028-3-johan@kernel.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit e8dca30f

 upstream.

CTA-861-F explicitly states that for RGB colorspace colorimetry should
be set to "none". Fix that.

Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Fixes: def23aa7

 ("drm: bridge: dw-hdmi: Switch to V4L bus format and encodings")
Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20200304232512.51616-2-jernej.skrabec@siol.net


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit f50b7dac upstream.

On a system configured to trigger a crash_kexec() reboot, when only one CPU
is online and another CPU panics while starting-up, crash_smp_send_stop()
will fail to send any STOP message to the other already online core,
resulting in fail to freeze and registers not properly saved.

Moreover even if the proper messages are sent (case CPUs > 2)
it will similarly fail to account for the booting CPU when executing
the final stop wait-loop, so potentially resulting in some CPU not
been waited for shutdown before rebooting.

A tangible effect of this behaviour can be observed when, after a panic
with kexec enabled and loaded, on the following reboot triggered by kexec,
the cpu that could not be successfully stopped fails to come back online:

[  362.291022] ------------[ cut here ]------------
[  362.291525] kernel BUG at arch/arm64/kernel/cpufeature.c:886!
[  362.292023] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
[  362.292400] Modules linked in:
[  362.292970] CPU: 3 PID: 0 Comm: swapper/3 Kdump: loaded Not tainted 5.6.0-rc4-00003-gc780b890948a #105
[  362.293136] Hardware name: Foundation-v8A (DT)
[  362.293382] pstate: 200001c5 (nzCv dAIF -PAN -UAO)
[  362.294063] pc : has_cpuid_feature+0xf0/0x348
[  362.294177] lr : verify_local_elf_hwcaps+0x84/0xe8
[  362.294280] sp : ffff800011b1bf60
[  362.294362] x29: ffff800011b1bf60 x28: 0000000000000000
[  362.294534] x27: 0000000000000000 x26: 0000000000000000
[  362.294631] x25: 0000000000000000 x24: ffff80001189a25c
[  362.294718] x23: 0000000000000000 x22: 0000000000000000
[  362.294803] x21: ffff8000114aa018 x20: ffff800011156a00
[  362.294897] x19: ffff800010c944a0 x18: 0000000000000004
[  362.294987] x17: 0000000000000000 x16: 0000000000000000
[  362.295073] x15: 00004e53b831ae3c x14: 00004e53b831ae3c
[  362.295165] x13: 0000000000000384 x12: 0000000000000000
[  362.295251] x11: 0000000000000000 x10: 00400032b5503510
[  362.295334] x9 : 0000000000000000 x8 : ffff800010c7e204
[  362.295426] x7 : 00000000410fd0f0 x6 : 0000000000000001
[  362.295508] x5 : 00000000410fd0f0 x4 : 0000000000000000
[  362.295592] x3 : 0000000000000000 x2 : ffff8000100939d8
[  362.295683] x1 : 0000000000180420 x0 : 0000000000180480
[  362.296011] Call trace:
[  362.296257]  has_cpuid_feature+0xf0/0x348
[  362.296350]  verify_local_elf_hwcaps+0x84/0xe8
[  362.296424]  check_local_cpu_capabilities+0x44/0x128
[  362.296497]  secondary_start_kernel+0xf4/0x188
[  362.296998] Code: 52805001 72a00301 6b01001f 54000ec0 (d4210000)
[  362.298652] SMP: stopping secondary CPUs
[  362.300615] Starting crashdump kernel...
[  362.301168] Bye!
[    0.000000] Booting Linux on physical CPU 0x0000000003 [0x410fd0f0]
[    0.000000] Linux version 5.6.0-rc4-00003-gc780b890948a (crimar01@e120937-lin) (gcc version 8.3.0 (GNU Toolchain for the A-profile Architecture 8.3-2019.03 (arm-rel-8.36))) #105 SMP PREEMPT Fri Mar 6 17:00:42 GMT 2020
[    0.000000] Machine model: Foundation-v8A
[    0.000000] earlycon: pl11 at MMIO 0x000000001c090000 (options '')
[    0.000000] printk: bootconsole [pl11] enabled
.....
[    0.138024] rcu: Hierarchical SRCU implementation.
[    0.153472] its@2f020000: unable to locate ITS domain
[    0.154078] its@2f020000: Unable to locate ITS domain
[    0.157541] EFI services will not be available.
[    0.175395] smp: Bringing up secondary CPUs ...
[    0.209182] psci: failed to boot CPU1 (-22)
[    0.209377] CPU1: failed to boot: -22
[    0.274598] Detected PIPT I-cache on CPU2
[    0.278707] GICv3: CPU2: found redistributor 1 region 0:0x000000002f120000
[    0.285212] CPU2: Booted secondary processor 0x0000000001 [0x410fd0f0]
[    0.369053] Detected PIPT I-cache on CPU3
[    0.372947] GICv3: CPU3: found redistributor 2 region 0:0x000000002f140000
[    0.378664] CPU3: Booted secondary processor 0x0000000002 [0x410fd0f0]
[    0.401707] smp: Brought up 1 node, 3 CPUs
[    0.404057] SMP: Total of 3 processors activated.

Make crash_smp_send_stop() account also for the online status of the
calling CPU while evaluating how many CPUs are effectively online: this way
the right number of STOPs is sent and all other stopped-cores's registers
are properly saved.

Fixes: 78fd584c

 ("arm64: kdump: implement machine_crash_shutdown()")
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit d0bab0c3 upstream.

On a system with only one CPU online, when another one CPU panics while
starting-up, smp_send_stop() will fail to send any STOP message to the
other already online core, resulting in a system still responsive and
alive at the end of the panic procedure.

[  186.700083] CPU3: shutdown
[  187.075462] CPU2: shutdown
[  187.162869] CPU1: shutdown
[  188.689998] ------------[ cut here ]------------
[  188.691645] kernel BUG at arch/arm64/kernel/cpufeature.c:886!
[  188.692079] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP
[  188.692444] Modules linked in:
[  188.693031] CPU: 3 PID: 0 Comm: swapper/3 Not tainted 5.6.0-rc4-00001-g338d25c35a98 #104
[  188.693175] Hardware name: Foundation-v8A (DT)
[  188.693492] pstate: 200001c5 (nzCv dAIF -PAN -UAO)
[  188.694183] pc : has_cpuid_feature+0xf0/0x348
[  188.694311] lr : verify_local_elf_hwcaps+0x84/0xe8
[  188.694410] sp : ffff800011b1bf60
[  188.694536] x29: ffff800011b1bf60 x28: 0000000000000000
[  188.694707] x27: 0000000000000000 x26: 0000000000000000
[  188.694801] x25: 0000000000000000 x24: ffff80001189a25c
[  188.694905] x23: 0000000000000000 x22: 0000000000000000
[  188.694996] x21: ffff8000114aa018 x20: ffff800011156a38
[  188.695089] x19: ffff800010c944a0 x18: 0000000000000004
[  188.695187] x17: 0000000000000000 x16: 0000000000000000
[  188.695280] x15: 0000249dbde5431e x14: 0262cbe497efa1fa
[  188.695371] x13: 0000000000000002 x12: 0000000000002592
[  188.695472] x11: 0000000000000080 x10: 00400032b5503510
[  188.695572] x9 : 0000000000000000 x8 : ffff800010c80204
[  188.695659] x7 : 00000000410fd0f0 x6 : 0000000000000001
[  188.695750] x5 : 00000000410fd0f0 x4 : 0000000000000000
[  188.695836] x3 : 0000000000000000 x2 : ffff8000100939d8
[  188.695919] x1 : 0000000000180420 x0 : 0000000000180480
[  188.696253] Call trace:
[  188.696410]  has_cpuid_feature+0xf0/0x348
[  188.696504]  verify_local_elf_hwcaps+0x84/0xe8
[  188.696591]  check_local_cpu_capabilities+0x44/0x128
[  188.696666]  secondary_start_kernel+0xf4/0x188
[  188.697150] Code: 52805001 72a00301 6b01001f 54000ec0 (d4210000)
[  188.698639] ---[ end trace 3f12ca47652f7b72 ]---
[  188.699160] Kernel panic - not syncing: Attempted to kill the idle task!
[  188.699546] Kernel Offset: disabled
[  188.699828] CPU features: 0x00004,20c02008
[  188.700012] Memory Limit: none
[  188.700538] ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]---

[root@arch ~]# echo Helo
Helo
[root@arch ~]# cat /proc/cpuinfo | grep proce
processor	: 0

Make smp_send_stop() account also for the online status of the calling CPU
while evaluating how many CPUs are effectively online: this way, the right
number of STOPs is sent, so enforcing a proper freeze of the system at the
end of panic even under the above conditions.

Fixes: 08e875c1

 ("arm64: SMP support")
Reported-by: Dave Martin <Dave.Martin@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 3b36b13d upstream.

Commit 317d9313 ("ALSA: hda/realtek - Set default power save node to
0") makes the ALC225 have pop noise on S3 resume and cold boot.

So partially revert this commit for ALC225 to fix the regression.

Fixes: 317d9313 ("ALSA: hda/realtek - Set default power save node to 0")
BugLink: https://bugs.launchpad.net/bugs/1866357


Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Link: https://lore.kernel.org/r/20200311061328.17614-1-kai.heng.feng@canonical.com


Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

This reverts commit 0293f8d1

.

This patch shouldn't have been backported to 4.14.

Signed-off-by: Sasha Levin <sashal@kernel.org>

This reverts commit 2271c950

.

This patch shouldn't have been backported to 4.14.

Signed-off-by: Sasha Levin <sashal@kernel.org>

commit 8d677436 upstream.

The recent futex inode life time fix changed the ordering of the futex key
union struct members, but forgot to adjust the hash function accordingly,

As a result the hashing omits the leading 64bit and even hashes beyond the
futex key causing a bad hash distribution which led to a ~100% performance
regression.

Hand in the futex key pointer instead of a random struct member and make
the size calculation based of the struct offset.

Fixes: 8019ad13

 ("futex: Fix inode life-time issue")
Reported-by: Rong Chen <rong.a.chen@intel.com>
Decoded-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Rong Chen <rong.a.chen@intel.com>
Link: https://lkml.kernel.org/r/87h7yy90ve.fsf@nanos.tec.linutronix.de


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 8019ad13

 upstream.

As reported by Jann, ihold() does not in fact guarantee inode
persistence. And instead of making it so, replace the usage of inode
pointers with a per boot, machine wide, unique inode identifier.

This sequence number is global, but shared (file backed) futexes are
rare enough that this should not become a performance issue.

Reported-by: Jann Horn <jannh@google.com>
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

commit 82f2bc2f upstream.

Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when
casting to enums. The kernel does this in certain places, such as device
tree matches to set the version of the device being used, which allows
the kernel to avoid using a gigantic union.

https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428
https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402
https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264

To avoid a ton of false positive warnings, disable this particular part
of the warning, which has been split off into a separate diagnostic so
that the entire warning does not need to be turned off for clang. It
will be visible under W=1 in case people want to go about fixing these
easily and enabling the warning treewide.

Cc: stable@vger.kernel.org
Link: https://github.com/ClangBuiltLinux/linux/issues/887
Link: https://github.com/llvm/llvm-project/commit/2a41b31fcdfcb67ab7038fc2ffb606fd50b83a84


Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

[ Upstream commit a500f3bd ]

The differential channels require writing the channel offset register (COR).
Otherwise they do not work in differential mode.
The configuration of COR is missing in triggered mode.

Fixes: 5e1a1da0

 ("iio: adc: at91-sama5d2_adc: add hw trigger and buffer support")
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>