IPoIB: Take dev->xmit_lock around mc_list accesses

dev->mc_list accesses must be protected by dev->xmit_lock.
Found by Eli Cohen <eli@mellanox.co.il>.

Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
index 03b2ca6..bf1c08c 100644 (file)
--- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
@@ -827,7 +827,8 @@ void ipoib_mcast_restart_task(void *dev_ptr)
 
        ipoib_mcast_stop_thread(dev, 0);
 
-       spin_lock_irqsave(&priv->lock, flags);
+       spin_lock_irqsave(&dev->xmit_lock, flags);
+       spin_lock(&priv->lock);
 
        /*
         * Unfortunately, the networking core only gives us a list of all of
@@ -899,7 +900,9 @@ void ipoib_mcast_restart_task(void *dev_ptr)
                        list_add_tail(&mcast->list, &remove_list);
                }
        }
-       spin_unlock_irqrestore(&priv->lock, flags);
+
+       spin_unlock(&priv->lock);
+       spin_unlock_irqrestore(&dev->xmit_lock, flags);
 
        /* We have to cancel outside of the spinlock */
        list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {