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authorEric Dumazet <eric.dumazet@gmail.com>2010-06-03 04:13:21 +0000
committerDavid S. Miller <davem@davemloft.net>2010-06-03 20:01:51 -0700
commit4736022844fe694c4ee971fa2b6c1cb38dadbc78 (patch)
tree0eafa36fe68d886c152548bfc367627a57fe4dd5 /net/ipv4
parentbc10502dba37d3b210efd9f3867212298f13b78e (diff)
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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>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/route.c8
1 files changed, 3 insertions, 5 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 1cfe0d1..7b8eacd 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;
}