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| author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-06-03 04:13:21 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-06-03 20:01:51 -0700 |
| commit | 4736022844fe694c4ee971fa2b6c1cb38dadbc78 (patch) | |
| tree | 0eafa36fe68d886c152548bfc367627a57fe4dd5 | |
| parent | bc10502dba37d3b210efd9f3867212298f13b78e (diff) | |
| download | linux-4736022844fe694c4ee971fa2b6c1cb38dadbc78.tar.bz2 | |
ipv4: RCU changes in __mkroute_input()
Avoid two atomic ops on output device refcount
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv4/route.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 1cfe0d199e7c..7b8eacd5ac26 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -1957,22 +1957,22 @@ static void ip_handle_martian_source(struct net_device *dev, #endif } +/* called in rcu_read_lock() section */ static int __mkroute_input(struct sk_buff *skb, struct fib_result *res, struct in_device *in_dev, __be32 daddr, __be32 saddr, u32 tos, struct rtable **result) { - struct rtable *rth; int err; struct in_device *out_dev; - unsigned flags = 0; + unsigned int flags = 0; __be32 spec_dst; u32 itag; /* get a working reference to the output device */ - out_dev = in_dev_get(FIB_RES_DEV(*res)); + out_dev = __in_dev_get_rcu(FIB_RES_DEV(*res)); if (out_dev == NULL) { if (net_ratelimit()) printk(KERN_CRIT "Bug in ip_route_input" \ @@ -2053,8 +2053,6 @@ static int __mkroute_input(struct sk_buff *skb, *result = rth; err = 0; cleanup: - /* release the working reference to the output device */ - in_dev_put(out_dev); return err; } |