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authorDaniel Vetter <daniel.vetter@ffwll.ch>2015-07-09 23:44:28 +0200
committerDaniel Vetter <daniel.vetter@ffwll.ch>2015-07-22 16:25:46 +0200
commit7a3f3d6667f5f9ffd1517f6b21d64bbf5312042c (patch)
treea2c59c481e7969826badf3570dcfe5ad3b6d7573 /include/drm
parent169faecadd2444fc295c724c0a2f622b99e6bf19 (diff)
downloadlinux-linaro-stable-7a3f3d6667f5f9ffd1517f6b21d64bbf5312042c.tar.gz
drm: Check locking in drm_for_each_connector
Because of DP MST connectors can now be hotplugged and we must hold the right lock when walking the connector lists. Enforce this by checking the locking in our shiny new list walking macros. v2: Extract the locking check into a small static inline helper to help readability. This will be more important when we make the read list access rules more complicated in later patches. Inspired by comments from Chris. Unfortunately, due to header loops around the definition of struct drm_device the function interface is a bit funny. v3: Encoders aren't hotadded/removed. For each dp mst encoder we statically create one fake encoder per pipe so that we can support as many mst sinks as the hw can (Dave). Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Dave Airlie <airlied@redhat.com> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Diffstat (limited to 'include/drm')
-rw-r--r--include/drm/drm_crtc.h12
1 files changed, 11 insertions, 1 deletions
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 7c95a7df6065..499562274353 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -1589,8 +1589,18 @@ static inline struct drm_property *drm_property_find(struct drm_device *dev,
#define drm_for_each_crtc(crtc, dev) \
list_for_each_entry(crtc, &(dev)->mode_config.crtc_list, head)
+static inline void
+assert_drm_connector_list_read_locked(struct drm_mode_config *mode_config)
+{
+ WARN_ON(!mutex_is_locked(&mode_config->mutex));
+}
+
#define drm_for_each_connector(connector, dev) \
- list_for_each_entry(connector, &(dev)->mode_config.connector_list, head)
+ for (assert_drm_connector_list_read_locked(&(dev)->mode_config), \
+ connector = list_first_entry(&(dev)->mode_config.connector_list, \
+ struct drm_connector, head); \
+ &connector->head != (&(dev)->mode_config.connector_list); \
+ connector = list_next_entry(connector, head))
#define drm_for_each_encoder(encoder, dev) \
list_for_each_entry(encoder, &(dev)->mode_config.encoder_list, head)