ipv6: no more dev_put() in datagram_send_ctl()
Avoids touching device refcount in datagram_send_ctl(), thanks to RCU
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c
index 9f70452..e6f9cdf 100644
--- a/net/ipv6/datagram.c
+++ b/net/ipv6/datagram.c
@@ -537,12 +537,17 @@
addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
+ rcu_read_lock();
if (fl->oif) {
- dev = dev_get_by_index(net, fl->oif);
- if (!dev)
+ dev = dev_get_by_index_rcu(net, fl->oif);
+ if (!dev) {
+ rcu_read_unlock();
return -ENODEV;
- } else if (addr_type & IPV6_ADDR_LINKLOCAL)
+ }
+ } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
+ rcu_read_unlock();
return -EINVAL;
+ }
if (addr_type != IPV6_ADDR_ANY) {
int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
@@ -553,8 +558,7 @@
ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
}
- if (dev)
- dev_put(dev);
+ rcu_read_unlock();
if (err)
goto exit_f;