drm/amd/display: Add NULL checks for vblank workqueue

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[Why]
If we're running a headless config with 0 links then the vblank
workqueue will be NULL - causing a NULL pointer exception during
any commit.

[How]
Guard access to the workqueue if it's NULL and don't queue or flush
work if it is.

Reported-by: Mike Lothian <mike@fireburn.co.uk>
BugLink: https://gitlab.freedesktop.org/drm/amd/-/issues/1700
Fixes: 58aa1c50e5 ("drm/amd/display: Use vblank control events for PSR enable/disable")
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Nicholas Kazlauskas 2021-09-07 09:53:03 -04:00 • committed by Alex Deucher

parent 8a4d393ef4

commit 06dd1888ee

1 changed files with 18 additions and 14 deletions

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drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

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