drm/amdgpu/userq: Do not allow userspace to trivially triger kernel warnings

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[ Upstream commit 7b7d7693a5 ]

Userspace can either deliberately pass in the too small num_fences, or the
required number can legitimately grow between the two calls to the userq
wait ioctl. In both cases we do not want the emit the kernel warning
backtrace since nothing is wrong with the kernel and userspace will simply
get an errno reported back. So lets simply drop the WARN_ONs.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Fixes: a292fdecd7 ("drm/amdgpu: Implement userqueue signal/wait IOCTL")
Cc: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 2c333ea579)
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Tvrtko Ursulin 2026-02-23 12:41:31 +00:00 • committed by Sasha Levin

parent 6f60a78386

commit 1753f5f81a

1 changed files with 4 additions and 4 deletions

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drivers/gpu/drm/amd/amdgpu/amdgpu_userq_fence.c

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