X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=drivers%2Ftarget%2Ftarget_core_hba.c;h=be9cefc07407e80ef5dd7dfcbd8a0d025faf97f6;hb=df5c79e982b38eec1d184668d66f9ce0c426e2a1;hp=62ea4e8e70a8935398f2a0e86fc44627dfa3368e;hpb=cd369c2239dd08c273c0fafbbea44e3e0c509ebd;p=deliverable%2Flinux.git

diff --git a/drivers/target/target_core_hba.c b/drivers/target/target_core_hba.c
index 62ea4e8e70a8..be9cefc07407 100644
--- a/drivers/target/target_core_hba.c
+++ b/drivers/target/target_core_hba.c
@@ -84,8 +84,16 @@ void target_backend_unregister(const struct target_backend_ops *ops)
 	list_for_each_entry(tb, &backend_list, list) {
 		if (tb->ops == ops) {
 			list_del(&tb->list);
+			mutex_unlock(&backend_mutex);
+			/*
+			 * Wait for any outstanding backend driver ->rcu_head
+			 * callbacks to complete post TBO->free_device() ->
+			 * call_rcu(), before allowing backend driver module
+			 * unload of target_backend_ops->owner to proceed.
+			 */
+			rcu_barrier();
 			kfree(tb);
-			break;
+			return;
 		}
 	}
 	mutex_unlock(&backend_mutex);