drm/amd/display: Check return code for CRC drm_crtc_vblank_get

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[Why]
The call to drm_crtc_vblank_get can fail if vblank is disabled and
we try to increment the reference.

Since drm_crtc_vblank_get internally drops the reference when it fails
it means the subsequent drm_crtc_vblank_put(...) when closing the file
drops a zero reference.

This was found via igt@kms_plane@pixel-format-pipe-A-planes.

[How]
Check the return code and return it on failure.

We wouldn't have been able to enable CRC reading anyway since vblank
wasn't enabled.

Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: David Francis <David.Francis@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Nicholas Kazlauskas 2019-08-20 12:58:37 -04:00 • committed by Alex Deucher

parent 6da6c27928

commit 7a23512595

1 changed files with 5 additions and 1 deletions

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

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