From 05e8689c9a3a208bf75b60662778d81e23eac460 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Sun, 1 Nov 2009 19:45:16 +0000 Subject: [PATCH] ifb: RCU locking avoids touching dev refcount Avoids touching dev refcount in hotpath Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- drivers/net/ifb.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/net/ifb.c b/drivers/net/ifb.c index 030913f..69c2566 100644 --- a/drivers/net/ifb.c +++ b/drivers/net/ifb.c @@ -98,13 +98,15 @@ static void ri_tasklet(unsigned long dev) stats->tx_packets++; stats->tx_bytes +=skb->len; - skb->dev = dev_get_by_index(&init_net, skb->iif); + rcu_read_lock(); + skb->dev = dev_get_by_index_rcu(&init_net, skb->iif); if (!skb->dev) { + rcu_read_unlock(); dev_kfree_skb(skb); stats->tx_dropped++; break; } - dev_put(skb->dev); + rcu_read_unlock(); skb->iif = _dev->ifindex; if (from & AT_EGRESS) { -- 2.7.4