drm: allow multiple addMaps with the same 32-bit map offsset.

Reported on -mm kernels.

Signed-off-by: Dave Airlie <airlied@linux.ie>

diff --git a/drivers/char/drm/drm_bufs.c b/drivers/char/drm/drm_bufs.c
index 03c6db9..029baea 100644 (file)
--- a/drivers/char/drm/drm_bufs.c
+++ b/drivers/char/drm/drm_bufs.c
@@ -77,14 +77,16 @@ static int drm_map_handle(drm_device_t *dev, drm_hash_item_t *hash,
 #error Unsupported long size. Neither 64 nor 32 bits.
 #endif
 
-       if (use_hashed_handle) {
-               return drm_ht_just_insert_please(&dev->map_hash, hash,
-                                                user_token, 32 - PAGE_SHIFT - 3,
-                                                PAGE_SHIFT, DRM_MAP_HASH_OFFSET);
-       } else {
+       if (!use_hashed_handle) {
+               int ret;
                hash->key = user_token;
-               return drm_ht_insert_item(&dev->map_hash, hash);
+               ret = drm_ht_insert_item(&dev->map_hash, hash);
+               if (ret != -EINVAL)
+                       return ret;
        }
+       return drm_ht_just_insert_please(&dev->map_hash, hash,
+                                        user_token, 32 - PAGE_SHIFT - 3,
+                                        PAGE_SHIFT, DRM_MAP_HASH_OFFSET);
 }
 
 /**