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drm/amdgpu: Don't crash system if we can't get crtc

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Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Harry Wentland
2015-11-25 15:42:09 -05:00
committed by Alex Deucher
parent e86f9ceee1
commit 9ddf940f5d
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
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@@ -727,6 +727,12 @@ int amdgpu_get_vblank_timestamp_kms(struct drm_device *dev, unsigned int pipe,
/* Get associated drm_crtc: */
crtc = &adev->mode_info.crtcs[pipe]->base;
if (!crtc) {
/* This can occur on driver load if some component fails to
* initialize completely and driver is unloaded */
DRM_ERROR("Uninitialized crtc %d\n", pipe);
return -EINVAL;
}
/* Helper routine in DRM core does all the work: */
return drm_calc_vbltimestamp_from_scanoutpos(dev, pipe, max_error,