drm/amdgpu: hold reference to fences in amdgpu_sa_bo_new (v2)

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commit a8d81b3626 upstream.

An arbitrary amount of time can pass between spin_unlock and
fence_wait_any_timeout, so we need to ensure that nobody frees the
fences from under us.

A stress test (rapidly starting and killing hundreds of glxgears
instances) ran into a deadlock in fence_wait_any_timeout after
about an hour, and this race condition appears to be a plausible
cause.

v2: agd: rebase on upstream

Signed-off-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Nicolai Hähnle 2016-02-05 10:59:43 -05:00 • committed by Greg Kroah-Hartman

parent 978b8b828d

commit 7a42e7cd29

1 changed files with 4 additions and 1 deletions

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

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