drm: select the correct master to attempt to remove the lock from.

When destroying DRI sarea, make sure you use the master associated with the
sarea and not the one currently in charge

diff --git a/linux-core/drm_bufs.c b/linux-core/drm_bufs.c
index 031f8ba..f6ff75a 100644 (file)
--- a/linux-core/drm_bufs.c
+++ b/linux-core/drm_bufs.c
@@ -380,10 +380,12 @@ int drm_rmmap_locked(struct drm_device *dev, drm_local_map_t *map)
        struct drm_map_list *r_list = NULL, *list_t;
        drm_dma_handle_t dmah;
        int found = 0;
+       struct drm_master *master;
 
        /* Find the list entry for the map and remove it */
        list_for_each_entry_safe(r_list, list_t, &dev->maplist, head) {
                if (r_list->map == map) {
+                       master = r_list->master;
                        list_del(&r_list->head);
                        drm_ht_remove_key(&dev->map_hash,
                                          r_list->user_token >> PAGE_SHIFT);
@@ -413,9 +415,13 @@ int drm_rmmap_locked(struct drm_device *dev, drm_local_map_t *map)
                break;
        case _DRM_SHM:
                vfree(map->handle);
-               dev->sigdata.lock = dev->primary->master->lock.hw_lock = NULL;   /* SHM removed */
-               dev->primary->master->lock.file_priv = NULL;
-               wake_up_interruptible(&dev->primary->master->lock.lock_queue);
+               if (master) {
+                       if (dev->sigdata.lock == master->lock.hw_lock)
+                               dev->sigdata.lock = NULL;
+                       master->lock.hw_lock = NULL;   /* SHM removed */
+                       master->lock.file_priv = NULL;
+                       wake_up_interruptible(&master->lock.lock_queue);
+               }
                break;
        case _DRM_AGP:
        case _DRM_SCATTER_GATHER: