From: Daniel Vetter Date: Thu, 9 Jul 2015 21:44:30 +0000 (+0200) Subject: drm: Check locking in drm_for_each_fb X-Git-Tag: firefly_0821_release~176^2~1083^2~38^2~8 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=4676ba0be756b2b02b9737147713d458042962f7;p=firefly-linux-kernel-4.4.55.git drm: Check locking in drm_for_each_fb Ever since framebuffers are reference counted we have a special lock for the global fb list. Make sure users of that list do hold that lock when using the new iterators. Reviewed-by: Maarten Lankhorst Signed-off-by: Daniel Vetter --- diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index 499562274353..10547be5684a 100644 --- a/include/drm/drm_crtc.h +++ b/include/drm/drm_crtc.h @@ -1606,6 +1606,10 @@ assert_drm_connector_list_read_locked(struct drm_mode_config *mode_config) list_for_each_entry(encoder, &(dev)->mode_config.encoder_list, head) #define drm_for_each_fb(fb, dev) \ - list_for_each_entry(fb, &(dev)->mode_config.fb_list, head) + for (WARN_ON(!mutex_is_locked(&(dev)->mode_config.fb_lock)), \ + fb = list_first_entry(&(dev)->mode_config.fb_list, \ + struct drm_framebuffer, head); \ + &fb->head != (&(dev)->mode_config.fb_list); \ + fb = list_next_entry(fb, head)) #endif /* __DRM_CRTC_H__ */