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| author |   Maarten Lankhorst <maarten.lankhorst@canonical.com> | 2013-07-30 10:13:41 +0200 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2013-07-30 22:16:40 +0200 |
| commit | 85f4896123d0299128f2c95cc40f3b8b01d4b0f6 (patch) | |
| tree | cadd786200b218479e020386c4aa77cdd15688e5 /kernel/freezer.c | |
| parent | Merge tag 'firewire-fix' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394 (diff) | |
| download | linux-dev-85f4896123d0299128f2c95cc40f3b8b01d4b0f6.tar.xz linux-dev-85f4896123d0299128f2c95cc40f3b8b01d4b0f6.zip | |
mutex: Fix w/w mutex deadlock injection
The check needs to be for > 1, because ctx->acquired is already incremented.
This will prevent ww_mutex_lock_slow from returning -EDEADLK and not locking
the mutex. It caused a lot of false gpu lockups on radeon with
CONFIG_DEBUG_WW_MUTEX_SLOWPATH=y because a function that shouldn't be able
to return -EDEADLK did.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/51F775B5.201@canonical.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/freezer.c')
0 files changed, 0 insertions, 0 deletions