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drm/syncobj: call might_sleep before waiting for fence submission 

If either the DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT or
DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE flags are passed to
drm_syncobj_array_wait_timeout, the function might sleep if the fence at
one of the given timeline points has not yet been submitted. Therefore,
we should call might_sleep in that case to catch potential bugs.

Signed-off-by: Erik Kurzinger <ekurzinger@nvidia.com>
Signed-off-by: Simon Ser <contact@emersion.fr>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Simon Ser <contact@emersion.fr>
Link: https://patchwork.freedesktop.org/patch/msgid/20240119163208.3723457-3-ekurzinger@nvidia.com
This commit is contained in:
Erik Kurzinger 2024-01-19 08:32:08 -08:00 committed by Simon Ser
parent 18226ba521
commit d3f552488a
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/drm_syncobj.c
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@ -1044,8 +1044,10 @@ static signed long drm_syncobj_array_wait_timeout(struct drm_syncobj **syncobjs,
uint32_t signaled_count, i;
if (flags & (DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT |
DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE))
DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE)) {
might_sleep();
lockdep_assert_none_held_once();
}
points = kmalloc_array(count, sizeof(*points), GFP_KERNEL);
if (points == NULL)