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authorDaniel Vetter <daniel.vetter@ffwll.ch>2014-11-19 18:38:08 +0100
committerDave Airlie <airlied@redhat.com>2014-11-20 11:35:20 +1000
commitf52b69f1ecfdd7ef6867a257620258c09e569552 (patch)
tree743137d6d11bd5a9ed8bba2484de30c5f630944c /include/drm
parent6f75cea66c8dd043ced282016b21a639af176642 (diff)
drm/atomic: Don't overrun the connector array when hotplugging
Yet another fallout from not considering DP MST hotplug. With the previous patches we have stable indices, but it might still happen that a connector gets added between when we allocate the array and when we actually add a connector. Especially when we back off due to ww mutex contention or similar issues. So store the sizes of the arrays in struct drm_atomic_state and double check them. We don't really care about races except that we want to use a consistent value, so ACCESS_ONCE is all we need. And if we indeed notice that we'd overrun the array then just give up and restart the entire ioctl. Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Reviewed-by: Rob Clark <robdclark@gmail.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'include/drm')
-rw-r--r--include/drm/drm_crtc.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 7b28ab032a88..f3142c64e3d5 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -825,6 +825,7 @@ struct drm_bridge {
* @plane_states: pointer to array of plane states pointers
* @crtcs: pointer to array of CRTC pointers
* @crtc_states: pointer to array of CRTC states pointers
+ * @num_connector: size of the @connectors and @connector_states arrays
* @connectors: pointer to array of connector pointers
* @connector_states: pointer to array of connector states pointers
* @acquire_ctx: acquire context for this atomic modeset state update
@@ -836,6 +837,7 @@ struct drm_atomic_state {
struct drm_plane_state **plane_states;
struct drm_crtc **crtcs;
struct drm_crtc_state **crtc_states;
+ int num_connector;
struct drm_connector **connectors;
struct drm_connector_state **connector_states;

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