drm/radeon: delete radeon_fence_process in is_signaled, no deadlock

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commit 9eb00b5f56 upstream.

Delete the attempt to progress the queue when checking if fence is
signaled. This avoids deadlock.

dma-fence_ops::signaled can be called with the fence lock in unknown
state. For radeon, the fence lock is also the wait queue lock. This can
cause a self deadlock when signaled() tries to make forward progress on
the wait queue. But advancing the queue is unneeded because incorrectly
returning false from signaled() is perfectly acceptable.

Link: https://github.com/brave/brave-browser/issues/49182
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4641
Cc: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Robert McClinton <rbmccav@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 527ba26e50)
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Robert McClinton 2025-11-16 12:33:21 -05:00 • committed by Greg Kroah-Hartman

parent 871fba63be

commit 73bc12d6a5

1 changed files with 0 additions and 7 deletions

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drivers/gpu/drm/radeon/radeon_fence.c

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