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sunvnet: remove extra rcu_read_unlocks 

The RCU read lock is grabbed first thing in sunvnet_start_xmit_common()
so it always needs to be released.  This removes the conditional release
in the dropped packet error path and removes a couple of superfluous
calls in the middle of the code.

Reported-by: Bijan Mottahedeh <bijan.mottahedeh@oracle.com>
Signed-off-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Shannon Nelson 2017-02-13 10:57:02 -08:00 committed by David S. Miller
parent bf091f3f36
commit daa86e50f6
1 changed files with 2 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/net/ethernet/sun/sunvnet_common.c
View File

@ -1253,10 +1253,8 @@ int sunvnet_start_xmit_common(struct sk_buff *skb, struct net_device *dev,
rcu_read_lock();
port = vnet_tx_port(skb, dev);
if (unlikely(!port)) {
rcu_read_unlock();
if (unlikely(!port))
goto out_dropped;
}
if (skb_is_gso(skb) && skb->len > port->tsolen) {
err = vnet_handle_offloads(port, skb, vnet_tx_port);
@ -1281,7 +1279,6 @@ int sunvnet_start_xmit_common(struct sk_buff *skb, struct net_device *dev,
fl4.saddr = ip_hdr(skb)->saddr;
rt = ip_route_output_key(dev_net(dev), &fl4);
rcu_read_unlock();
if (!IS_ERR(rt)) {
skb_dst_set(skb, &rt->dst);
icmp_send(skb, ICMP_DEST_UNREACH,
@ -1441,8 +1438,7 @@ int sunvnet_start_xmit_common(struct sk_buff *skb, struct net_device *dev,
jiffies + VNET_CLEAN_TIMEOUT);
else if (port)
del_timer(&port->clean_timer);
if (port)
rcu_read_unlock();
rcu_read_unlock();
if (skb)
dev_kfree_skb(skb);
vnet_free_skbs(freeskbs);