diff options
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/drm_crtc.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index 781aef524b3b..3bdf2a650d9c 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -3792,6 +3792,13 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev, /* Keep the old fb, don't unref it. */ old_fb = NULL; } else { + /* + * Warn if the driver hasn't properly updated the crtc->fb + * field to reflect that the new framebuffer is now used. + * Failing to do so will screw with the reference counting + * on framebuffers. + */ + WARN_ON(crtc->fb != fb); /* Unref only the old framebuffer. */ fb = NULL; } |