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net: avoid a dev refcount in ip_mc_find_dev()

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We hold RTNL in ip_mc_find_dev(), no need to touch device refcount.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2010-10-19 00:39:18 +00:00 committed by David S. Miller
parent 5d6076bb2e
commit 9e917dca74
2 changed files with 3 additions and 3 deletions
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2
net/ipv4/fib_frontend.c
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@ -153,7 +153,7 @@ static void fib_flush(struct net *net)
* @addr: the source address
* @devref: if true, take a reference on the found device
*
* If a caller uses devref=false, it should be protected by RCU
* If a caller uses devref=false, it should be protected by RCU, or RTNL
*/
struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
{

4
net/ipv4/igmp.c
View File

@ -1418,6 +1418,7 @@ void ip_mc_destroy_dev(struct in_device *in_dev)
write_unlock_bh(&in_dev->mc_list_lock);
}
/* RTNL is locked */
static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
{
struct flowi fl = { .nl_u = { .ip4_u =
@ -1433,10 +1434,9 @@ static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
return idev;
}
if (imr->imr_address.s_addr) {
dev = ip_dev_find(net, imr->imr_address.s_addr);
dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
if (!dev)
return NULL;
dev_put(dev);
}
if (!dev && !ip_route_output_key(net, &rt, &fl)) {