Merge branch 'drm-fixes-4.4' of git://people.freedesktop.org/~agd5f/linux into drm...

[cascardo/linux.git] / fs / btrfs / delayed-inode.c

diff --git a/fs/btrfs/delayed-inode.c b/fs/btrfs/delayed-inode.c
index a2ae427..e0941fb 100644 (file)
--- a/fs/btrfs/delayed-inode.c
+++ b/fs/btrfs/delayed-inode.c
@@ -463,6 +463,10 @@ static int __btrfs_add_delayed_deletion_item(struct btrfs_delayed_node *node,
 static void finish_one_item(struct btrfs_delayed_root *delayed_root)
 {
        int seq = atomic_inc_return(&delayed_root->items_seq);
+
+       /*
+        * atomic_dec_return implies a barrier for waitqueue_active
+        */
        if ((atomic_dec_return(&delayed_root->items) <
            BTRFS_DELAYED_BACKGROUND || seq % BTRFS_DELAYED_BATCH == 0) &&
            waitqueue_active(&delayed_root->wait))