drm/amd/display: Add NULL checks for vblank workqueue
[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: 58aa1c50 ("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>
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