drm: fix fb-helper vs MST dangling connector ptrs (v2)

VT switch back/forth from console to xserver (for example) has potential
to go horribly wrong if a dynamic DP MST connector ends up in the saved
modeset that is restored when switching back to fbcon.

When removing a dynamic connector, don't forget to clean up the saved
state.

v1: original
v2: null out set->fb if no more connectors to avoid making i915 cranky

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1184968
Cc: stable@vger.kernel.org #v3.17+
Signed-off-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index cf775a4..dc386eb 100644 (file)
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -145,6 +145,31 @@ int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_
 }
 EXPORT_SYMBOL(drm_fb_helper_add_one_connector);
 
+static void remove_from_modeset(struct drm_mode_set *set,
+               struct drm_connector *connector)
+{
+       int i, j;
+
+       for (i = 0; i < set->num_connectors; i++) {
+               if (set->connectors[i] == connector)
+                       break;
+       }
+
+       if (i == set->num_connectors)
+               return;
+
+       for (j = i + 1; j < set->num_connectors; j++) {
+               set->connectors[j - 1] = set->connectors[j];
+       }
+       set->num_connectors--;
+
+       /* because i915 is pissy about this..
+        * TODO maybe need to makes sure we set it back to !=NULL somewhere?
+        */
+       if (set->num_connectors == 0)
+               set->fb = NULL;
+}
+
 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
                                       struct drm_connector *connector)
 {
@@ -167,6 +192,11 @@ int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
        }
        fb_helper->connector_count--;
        kfree(fb_helper_connector);
+
+       /* also cleanup dangling references to the connector: */
+       for (i = 0; i < fb_helper->crtc_count; i++)
+               remove_from_modeset(&fb_helper->crtc_info[i].mode_set, connector);
+
        return 0;
 }
 EXPORT_SYMBOL(drm_fb_helper_remove_one_connector);