[IPV6]: The ifa lock is a BH lock

The ifa lock is expected to be taken in BH context (by addrconf timers)
so we must disable BH when accessing it from user context.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 8ea1e36bf8eb..0c5042e7380d 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1909,11 +1909,11 @@ static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
 
         if (!IS_ERR(ifp)) {
-                spin_lock(&ifp->lock);
+                spin_lock_bh(&ifp->lock);
                 ifp->valid_lft = valid_lft;
                 ifp->prefered_lft = prefered_lft;
                 ifp->tstamp = jiffies;
-                spin_unlock(&ifp->lock);
+                spin_unlock_bh(&ifp->lock);
 
                 addrconf_dad_start(ifp, 0);
                 in6_ifa_put(ifp);