netdev - [PATCH 3/5] ifb: fix tx_queue

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Message-Id: <1292251414-5154-3-git-send-email-xiaosuo@gmail.com>
Date:	Mon, 13 Dec 2010 22:43:32 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Jamal Hadi Salim <hadi@...erus.ca>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Changli Gao <xiaosuo@...il.com>
Subject: [PATCH 3/5] ifb: fix tx_queue_len overlimit

We should check the length of rq after enqueuing, otherwise the length
of rq will be over tx_queue_len.

Signed-off-by: Changli Gao <xiaosuo@...il.com>
---
 drivers/net/ifb.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ifb.c b/drivers/net/ifb.c
index 1628d01..57c5cfb 100644
--- a/drivers/net/ifb.c
+++ b/drivers/net/ifb.c
@@ -131,15 +131,15 @@ static netdev_tx_t ifb_xmit(struct sk_buff *skb, struct net_device *dev)
 		return NETDEV_TX_OK;
 	}
 
-	if (skb_queue_len(&dp->rq) >= dev->tx_queue_len)
-		netif_stop_queue(dev);
-
 	__skb_queue_tail(&dp->rq, skb);
 	if (!dp->tasklet_pending) {
 		dp->tasklet_pending = 1;
 		tasklet_schedule(&dp->ifb_tasklet);
 	}
 
+	if (skb_queue_len(&dp->rq) >= dev->tx_queue_len)
+		netif_stop_queue(dev);
+
 	return NETDEV_TX_OK;
 }
 
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