diff options
Diffstat (limited to 'net/ipv6/mcast.c')
| -rw-r--r-- | net/ipv6/mcast.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c index 9949554e3211..e2a11a2f3b25 100644 --- a/net/ipv6/mcast.c +++ b/net/ipv6/mcast.c @@ -907,23 +907,22 @@ static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev, static int __ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr, unsigned int mode) { - struct ifmcaddr6 *mc; struct inet6_dev *idev; - - ASSERT_RTNL(); + struct ifmcaddr6 *mc; /* we need to take a reference on idev */ idev = in6_dev_get(dev); - if (!idev) return -EINVAL; - if (idev->dead) { + mutex_lock(&idev->mc_lock); + + if (READ_ONCE(idev->dead)) { + mutex_unlock(&idev->mc_lock); in6_dev_put(idev); return -ENODEV; } - mutex_lock(&idev->mc_lock); for_each_mc_mclock(idev, mc) { if (ipv6_addr_equal(&mc->mca_addr, addr)) { mc->mca_users++; |