btrfs: Add handler for invalidate page

[deliverable/linux.git] / fs / btrfs / raid56.c

diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c
index fcf7265ca46fd84a65b647619f4e07ba996d7a9f..1a33d3eb36de184e4cbcf72efb26687857c70051 100644 (file)
--- a/fs/btrfs/raid56.c
+++ b/fs/btrfs/raid56.c
@@ -810,7 +810,11 @@ static noinline void unlock_stripe(struct btrfs_raid_bio *rbio)
                        }
 
                        goto done_nolock;
-               } else  if (waitqueue_active(&h->wait)) {
+                       /*
+                        * The barrier for this waitqueue_active is not needed,
+                        * we're protected by h->lock and can't miss a wakeup.
+                        */
+               } else if (waitqueue_active(&h->wait)) {
                        spin_unlock(&rbio->bio_list_lock);
                        spin_unlock_irqrestore(&h->lock, flags);
                        wake_up(&h->wait);