Merge master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6 into for-linus

1 files changed, 8 insertions, 0 deletions

diff --git a/fs/aio.c b/fs/aio.c
index b74c567383bc..6af921940622 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -996,6 +996,14 @@ put_rq:
 	/* everything turned out well, dispose of the aiocb. */
 	ret = __aio_put_req(ctx, iocb);
 
+	/*
+	 * We have to order our ring_info tail store above and test
+	 * of the wait list below outside the wait lock.  This is
+	 * like in wake_up_bit() where clearing a bit has to be
+	 * ordered with the unlocked test.
+	 */
+	smp_mb();
+
 	if (waitqueue_active(&ctx->wait))
 		wake_up(&ctx->wait);