ravb: Fix races between ravb_tx_timeout_work() and net related ops

stable inclusion
from stable-v4.19.301
commit b655af79a24379ae1107795e69c80e157c420be3
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I7EDZ1
CVE: CVE-2023-35827

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=b655af79a24379ae1107795e69c80e157c420be3



--------------------------------

[ Upstream commit 9870257a0a338cd8d6c1cddab74e703f490f6779 ]

Fix races between ravb_tx_timeout_work() and functions of net_device_ops
and ethtool_ops by using rtnl_trylock() and rtnl_unlock(). Note that
since ravb_close() is under the rtnl lock and calls cancel_work_sync(),
ravb_tx_timeout_work() should calls rtnl_trylock(). Otherwise, a deadlock
may happen in ravb_tx_timeout_work() like below:

CPU0			CPU1
			ravb_tx_timeout()
			schedule_work()
...
__dev_close_many()
// Under rtnl lock
ravb_close()
cancel_work_sync()
// Waiting
			ravb_tx_timeout_work()
			rtnl_lock()
			// This is possible to cause a deadlock

If rtnl_trylock() fails, rescheduling the work with sleep for 1 msec.

Fixes: c156633f ("Renesas Ethernet AVB driver proper")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Link: https://lore.kernel.org/r/20231127122420.3706751-1-yoshihiro.shimoda.uh@renesas.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Conflicts:
	drivers/net/ethernet/renesas/ravb_main.c
Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com>