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  1. Dec 09, 2011
  3. Dec 08, 2011
  5. Dec 07, 2011
    • Thomas Meyer's avatar
      vmwgfx: Use kcalloc instead of kzalloc to allocate array · 24bb5a0c
      Thomas Meyer authored 
      The advantage of kcalloc is, that will prevent integer overflows which could
result from the multiplication of number of elements and size and it is also
a bit nicer to read.

The semantic patch that makes this change is available
in https://lkml.org/lkml/2011/11/25/107



Signed-off-by: default avatarThomas Meyer <thomas@m3y3r.de>
Reviewed-by: default avatarJakob Bornecrantz <jakob@vmware.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
      24bb5a0c
    • Daniel Vetter's avatar
      drm/i915: fix infinite recursion on unbind due to ilk vt-d w/a · eb1711bb
      Daniel Vetter authored 
      The recursion loop goes retire_requests->unbind->gpu_idle->retire_reqeusts.

Every time we go through this we need a
- active object that can be retired
- and there are no other references to that object than the one from
  the active list, so that it gets unbound and freed immediately.
Otherwise the recursion stops. So the recursion is only limited by the
number of objects that fit these requirements sitting in the active list
any time retire_request is called.

Issue exercised by tests/gem_unref_active_buffers from i-g-t.

There's been a decent bikeshed discussion whether it wouldn't be
better to pass around a flag, but imo this is o.k. for such a limited
case that only supports a w/a.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=42180



Signed-Off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: default avatarChris Wilson <chris@chris-wilson>
[ickle- we built better bikesheds, but this keeps the rain off for now]
Tested-by: default avatarDave Airlie <airlied@redhat.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
      eb1711bb
    • Alex Deucher's avatar
      drm/radeon/kms: fix return type for radeon_encoder_get_dp_bridge_encoder_id · dc87cd5c
      Alex Deucher authored 
      

Seems like something got mis-merged here.

Noticed by kallisti5 on IRC.

Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
      dc87cd5c
    • Arnd Bergmann's avatar
      Merge branch 'samsung-fixes-2' of... · e3a36c41
      Arnd Bergmann authored 
      Merge branch 'samsung-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung into fixes
      e3a36c41
    • Al Viro's avatar
      fix apparmor dereferencing potentially freed dentry, sanitize __d_path() API · 02125a82
      Al Viro authored 
      

__d_path() API is asking for trouble and in case of apparmor d_namespace_path()
getting just that.  The root cause is that when __d_path() misses the root
it had been told to look for, it stores the location of the most remote ancestor
in *root.  Without grabbing references.  Sure, at the moment of call it had
been pinned down by what we have in *path.  And if we raced with umount -l, we
could have very well stopped at vfsmount/dentry that got freed as soon as
prepend_path() dropped vfsmount_lock.

It is safe to compare these pointers with pre-existing (and known to be still
alive) vfsmount and dentry, as long as all we are asking is "is it the same
address?".  Dereferencing is not safe and apparmor ended up stepping into
that.  d_namespace_path() really wants to examine the place where we stopped,
even if it's not connected to our namespace.  As the result, it looked
at ->d_sb->s_magic of a dentry that might've been already freed by that point.
All other callers had been careful enough to avoid that, but it's really
a bad interface - it invites that kind of trouble.

The fix is fairly straightforward, even though it's bigger than I'd like:
	* prepend_path() root argument becomes const.
	* __d_path() is never called with NULL/NULL root.  It was a kludge
to start with.  Instead, we have an explicit function - d_absolute_root().
Same as __d_path(), except that it doesn't get root passed and stops where
it stops.  apparmor and tomoyo are using it.
	* __d_path() returns NULL on path outside of root.  The main
caller is show_mountinfo() and that's precisely what we pass root for - to
skip those outside chroot jail.  Those who don't want that can (and do)
use d_path().
	* __d_path() root argument becomes const.  Everyone agrees, I hope.
	* apparmor does *NOT* try to use __d_path() or any of its variants
when it sees that path->mnt is an internal vfsmount.  In that case it's
definitely not mounted anywhere and dentry_path() is exactly what we want
there.  Handling of sysctl()-triggered weirdness is moved to that place.
	* if apparmor is asked to do pathname relative to chroot jail
and __d_path() tells it we it's not in that jail, the sucker just calls
d_absolute_path() instead.  That's the other remaining caller of __d_path(),
BTW.
        * seq_path_root() does _NOT_ return -ENAMETOOLONG (it's stupid anyway -
the normal seq_file logics will take care of growing the buffer and redoing
the call of ->show() just fine).  However, if it gets path not reachable
from root, it returns SEQ_SKIP.  The only caller adjusted (i.e. stopped
ignoring the return value as it used to do).

Reviewed-by: default avatarJohn Johansen <john.johansen@canonical.com>
ACKed-by: default avatarJohn Johansen <john.johansen@canonical.com>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
Cc: stable@vger.kernel.org
      02125a82
    • Christoph Hellwig's avatar
      xfs: fix the logspace waiting algorithm · 9f9c19ec
      Christoph Hellwig authored 
      

Apply the scheme used in log_regrant_write_log_space to wake up any other
threads waiting for log space before the newly added one to
log_regrant_write_log_space as well, and factor the code into readable
helpers.  For each of the queues we have add two helpers:

 - one to try to wake up all waiting threads.  This helper will also be
   usable by xfs_log_move_tail once we remove the current opportunistic
   wakeups in it.
 - one to sleep on t_wait until enough log space is available, loosely
   modelled after Linux waitqueues.
 
And use them to reimplement the guts of log_regrant_write_log_space and
log_regrant_write_log_space.  These two function now use one and the same
algorithm for waiting on log space instead of subtly different ones before,
with an option to completely unify them in the near future.

Also move the filesystem shutdown handling to the common caller given
that we had to touch it anyway.

Based on hard debugging and an earlier patch from
Chandra Seetharaman <sekharan@us.ibm.com>.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarChandra Seetharaman <sekharan@us.ibm.com>
Tested-by: default avatarChandra Seetharaman <sekharan@us.ibm.com>
Signed-off-by: default avatarBen Myers <bpm@sgi.com>
      9f9c19ec
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net · b835c0f4
      Linus Torvalds authored 
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net:
  net: Silence seq_scale() unused warning
  ipv4:correct description for tcp_max_syn_backlog
  pasemi_mac: Fix building as module
  netback: Fix alert message.
  r8169: fix Rx index race between FIFO overflow recovery and NAPI handler.
  r8169: Rx FIFO overflow fixes.
  ipv4: Fix peer validation on cached lookup.
  ipv4: make sure RTO_ONLINK is saved in routing cache
  iwlwifi: change the default behavior of watchdog timer
  iwlwifi: do not re-configure HT40 after associated
  iwlagn: fix HW crypto for TX-only keys
  Revert "mac80211: clear sta.drv_priv on reconfiguration"
  mac80211: fill rate filter for internal scan requests
  cfg80211: amend regulatory NULL dereference fix
  cfg80211: fix race on init and driver registration
      b835c0f4