drm/scheduler: Fix lockup in drm_sched_entity_kill()

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The drm_sched_entity_kill() is invoked twice by drm_sched_entity_destroy()
while userspace process is exiting or being killed. First time it's invoked
when sched entity is flushed and second time when entity is released. This
causes a lockup within wait_for_completion(entity_idle) due to how completion
API works.

Calling wait_for_completion() more times than complete() was invoked is a
error condition that causes lockup because completion internally uses
counter for complete/wait calls. The complete_all() must be used instead
in such cases.

This patch fixes lockup of Panfrost driver that is reproducible by killing
any application in a middle of 3d drawing operation.

Fixes: 2fdb8a8f07 ("drm/scheduler: rework entity flush, kill and fini")
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221123001303.533968-1-dmitry.osipenko@collabora.com

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This commit is contained in:

Dmitry Osipenko 2022-11-23 03:13:03 +03:00

parent 834c23e4f7

commit 9f1ecfc5dc

2 changed files with 3 additions and 3 deletions

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2

drivers/gpu/drm/scheduler/sched_entity.c

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4

drivers/gpu/drm/scheduler/sched_main.c

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