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>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/ethernet/ibm/emac/core.c b/drivers/net/ethernet/ibm/emac/core.c
index 2dfc60308648..7af09cbc53f0 100644
--- 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)