Warnings before patch:
files: ['drivers/gpu/drm/drm_vblank.c']
Warning: drivers/gpu/drm/drm_vblank.c:411 No description found for return value of 'drm_crtc_accurate_vblank_count'
Warning: drivers/gpu/drm/drm_vblank.c:594 No description found for return value of 'drm_crtc_vblank_waitqueue'
Warning: drivers/gpu/drm/drm_vblank.c:943 No description found for return value of 'drm_vblank_count_and_time'
Warning: drivers/gpu/drm/drm_vblank.c:983 No description found for return value of 'drm_crtc_vblank_count_and_time'
Warning: drivers/gpu/drm/drm_vblank.c:998 No description found for return value of 'drm_crtc_next_vblank_start'
Warning: drivers/gpu/drm/drm_vblank.c:1918 No description found for return value of 'drm_handle_vblank'

Current warnings:
files: ['drivers/gpu/drm/drm_vblank.c']
Warning: drivers/gpu/drm/drm_vblank.c:411 No description found for return value of 'drm_crtc_accurate_vblank_count'
Warning: drivers/gpu/drm/drm_vblank.c:594 No description found for return value of 'drm_crtc_vblank_waitqueue'
Warning: drivers/gpu/drm/drm_vblank.c:941 No description found for return value of 'drm_vblank_count_and_time'
Warning: drivers/gpu/drm/drm_vblank.c:981 No description found for return value of 'drm_crtc_vblank_count_and_time'
Warning: drivers/gpu/drm/drm_vblank.c:996 No description found for return value of 'drm_crtc_next_vblank_start'
Warning: drivers/gpu/drm/drm_vblank.c:1916 No description found for return value of 'drm_handle_vblank'

Warnings before: 6 after: 6