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drm: Check locking in drm_for_each_fb

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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 <maarten.lankhorst@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
This commit is contained in:
Daniel Vetter 2015-07-09 23:44:30 +02:00
parent 3a58ee1065
commit 4676ba0be7
1 changed files with 5 additions and 1 deletions
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6
include/drm/drm_crtc.h
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@ -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__ */