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authorDavid S. Miller <davem@davemloft.net>2012-02-02 01:34:25 +0400
committerDavid S. Miller <davem@davemloft.net>2012-02-02 01:34:25 +0400
commit3329bdfc4071840816d6666c6463fdb0bd4c8264 (patch)
tree93e0cb011640d524fc54dedeb3d373068c138152 /net/decnet
parentf79d52c254e4e2cef3da64dc02ade3bc8f10c539 (diff)
downloadlinux-3329bdfc4071840816d6666c6463fdb0bd4c8264.tar.xz
decnet: Add missing neigh->ha locking to dn_neigh_output_packet()
Basically, mirror the logic in neigh_connected_output(). Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/decnet')
-rw-r--r--net/decnet/dn_neigh.c24
1 files changed, 15 insertions, 9 deletions
diff --git a/net/decnet/dn_neigh.c b/net/decnet/dn_neigh.c
index befe426491ba..ee7013f24fca 100644
--- a/net/decnet/dn_neigh.c
+++ b/net/decnet/dn_neigh.c
@@ -205,17 +205,23 @@ static int dn_neigh_output_packet(struct sk_buff *skb)
struct neighbour *neigh = dst_get_neighbour_noref(dst);
struct net_device *dev = neigh->dev;
char mac_addr[ETH_ALEN];
+ unsigned int seq;
+ int err;
dn_dn2eth(mac_addr, rt->rt_local_src);
- if (dev_hard_header(skb, dev, ntohs(skb->protocol), neigh->ha,
- mac_addr, skb->len) >= 0)
- return dev_queue_xmit(skb);
-
- if (net_ratelimit())
- printk(KERN_DEBUG "dn_neigh_output_packet: oops, can't send packet\n");
-
- kfree_skb(skb);
- return -EINVAL;
+ do {
+ seq = read_seqbegin(&neigh->ha_lock);
+ err = dev_hard_header(skb, dev, ntohs(skb->protocol),
+ neigh->ha, mac_addr, skb->len);
+ } while (read_seqretry(&neigh->ha_lock, seq));
+
+ if (err >= 0)
+ err = dev_queue_xmit(skb);
+ else {
+ kfree_skb(skb);
+ err = -EINVAL;
+ }
+ return err;
}
static int dn_long_output(struct neighbour *neigh, struct sk_buff *skb)