macvtap: use prepare_to_wait/finish_wait to ensure mb

instead of raw assignment to current->state Signed-off-by: Hong Zhiguo <[email protected]> Signed-off-by: David S. Miller <[email protected]>
makiko-fly · Jun 7, 2012 · ccf7e72 · ccf7e72
1 parent e9939c8
commit ccf7e72
Showing 1 changed file with 3 additions and 5 deletions.
diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
@@ -847,13 +847,12 @@ static ssize_t macvtap_do_read(struct macvtap_queue *q, struct kiocb *iocb,
 			       const struct iovec *iv, unsigned long len,
 			       int noblock)
 {
-	DECLARE_WAITQUEUE(wait, current);
+	DEFINE_WAIT(wait);
 	struct sk_buff *skb;
 	ssize_t ret = 0;
 
-	add_wait_queue(sk_sleep(&q->sk), &wait);
 	while (len) {
-		current->state = TASK_INTERRUPTIBLE;
+		prepare_to_wait(sk_sleep(&q->sk), &wait, TASK_INTERRUPTIBLE);
 
 		/* Read frames from the queue */
 		skb = skb_dequeue(&q->sk.sk_receive_queue);
@@ -875,8 +874,7 @@ static ssize_t macvtap_do_read(struct macvtap_queue *q, struct kiocb *iocb,
 		break;
 	}
 
-	current->state = TASK_RUNNING;
-	remove_wait_queue(sk_sleep(&q->sk), &wait);
+	finish_wait(sk_sleep(&q->sk), &wait);
 	return ret;
 }