bridge: mcast: Use spin_lock() instead of spin_lock_bh()

IGMPv3 / MLDv2 Membership Reports are only processed from the data path
with softIRQ disabled, so there is no need to call spin_lock_bh(). Use
spin_lock() instead.

This is consistent with how other IGMP / MLD packets are processed.
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/bridge/br_multicast.c

@@ -2669,7 +2669,7 @@ static int br_ip4_multicast_igmp3_report(struct net_bridge_mcast *brmctx,
 		if (!pmctx || igmpv2)
 			continue;
 
-		spin_lock_bh(&brmctx->br->multicast_lock);
+		spin_lock(&brmctx->br->multicast_lock);
 		if (!br_multicast_ctx_should_use(brmctx, pmctx))
 			goto unlock_continue;
 
@@ -2717,7 +2717,7 @@ static int br_ip4_multicast_igmp3_report(struct net_bridge_mcast *brmctx,
 		if (changed)
 			br_mdb_notify(brmctx->br->dev, mdst, pg, RTM_NEWMDB);
 unlock_continue:
-		spin_unlock_bh(&brmctx->br->multicast_lock);
+		spin_unlock(&brmctx->br->multicast_lock);
 	}
 
 	return err;
@@ -2807,7 +2807,7 @@ static int br_ip6_multicast_mld2_report(struct net_bridge_mcast *brmctx,
 		if (!pmctx || mldv1)
 			continue;
 
-		spin_lock_bh(&brmctx->br->multicast_lock);
+		spin_lock(&brmctx->br->multicast_lock);
 		if (!br_multicast_ctx_should_use(brmctx, pmctx))
 			goto unlock_continue;
 
@@ -2859,7 +2859,7 @@ static int br_ip6_multicast_mld2_report(struct net_bridge_mcast *brmctx,
 		if (changed)
 			br_mdb_notify(brmctx->br->dev, mdst, pg, RTM_NEWMDB);
 unlock_continue:
-		spin_unlock_bh(&brmctx->br->multicast_lock);
+		spin_unlock(&brmctx->br->multicast_lock);
 	}
 
 	return err;