net/ibm/emac: add mutex to 'set multicast list'

for preventing race conditions within ioctl calls. Signed-off-by: Ivan Mikhaylov <ivan@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
mariux64 · Sep 16, 2016 · 7106a06 · 7106a06
1 parent 01afd97
commit 7106a06
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/drivers/net/ethernet/ibm/emac/core.c b/drivers/net/ethernet/ibm/emac/core.c
@@ -977,7 +977,10 @@ static void emac_set_multicast_list(struct net_device *ndev)
 		dev->mcast_pending = 1;
 		return;
 	}
+
+	mutex_lock(&dev->link_lock);
 	__emac_set_multicast_list(dev);
+	mutex_unlock(&dev->link_lock);
 }
 
 static int emac_set_mac_address(struct net_device *ndev, void *sa)