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macvtap: do not add self to waitqueue if doing a nonblock read 

There's no need to add self to waitqueue if doing a nonblock read. This could
help to avoid the spinlock contention.

Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Wang 2013-06-05 23:54:34 +00:00 committed by David S. Miller
parent ed0483fa06
commit 89cee917de
1 changed files with 5 additions and 2 deletions
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7
drivers/net/macvtap.c
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@ -845,7 +845,9 @@ static ssize_t macvtap_do_read(struct macvtap_queue *q, struct kiocb *iocb,
ssize_t ret = 0; ssize_t ret = 0;
while (len) { while (len) {
prepare_to_wait(sk_sleep(&q->sk), &wait, TASK_INTERRUPTIBLE); if (!noblock)
prepare_to_wait(sk_sleep(&q->sk), &wait,
TASK_INTERRUPTIBLE);
/* Read frames from the queue */ /* Read frames from the queue */
skb = skb_dequeue(&q->sk.sk_receive_queue); skb = skb_dequeue(&q->sk.sk_receive_queue);
@ -867,7 +869,8 @@ static ssize_t macvtap_do_read(struct macvtap_queue *q, struct kiocb *iocb,
break; break;
} }
finish_wait(sk_sleep(&q->sk), &wait); if (!noblock)
finish_wait(sk_sleep(&q->sk), &wait);
return ret; return ret;
} }