From: Eric Dumazet <dada1@cosmosbay.com>
Date: Tue, 27 Sep 2005 22:22:58 +0000 (-0700)
Subject: [NET]: Prefetch dev->qdisc_lock in dev_queue_xmit()
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=2d7ceece08ad940d0ceac98ab1b5a3b82dfc2a0a;p=openwrt%2Fstaging%2Fblogic.git

[NET]: Prefetch dev->qdisc_lock in dev_queue_xmit()

We know the lock is going to be taken.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/core/dev.c b/net/core/dev.c
index 37c881070963..9066c874e273 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1259,6 +1259,8 @@ int dev_queue_xmit(struct sk_buff *skb)
 	      	if (skb_checksum_help(skb, 0))
 	      		goto out_kfree_skb;
 
+	spin_lock_prefetch(&dev->queue_lock);
+
 	/* Disable soft irqs for various locks below. Also 
 	 * stops preemption for RCU. 
 	 */