IPoIB: Fix deadlock between dev_change_flags() and __ipoib_dev_flush()

[pandora-kernel.git] / drivers / infiniband / ulp / ipoib / ipoib_main.c

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index 82cec1a..dcb50ce 100644 (file)
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -119,7 +119,7 @@ int ipoib_open(struct net_device *dev)
                struct ipoib_dev_priv *cpriv;
 
                /* Bring up any child interfaces too */
-               mutex_lock(&priv->vlan_mutex);
+               down_read(&priv->vlan_rwsem);
                list_for_each_entry(cpriv, &priv->child_intfs, list) {
                        int flags;
 
@@ -129,7 +129,7 @@ int ipoib_open(struct net_device *dev)
 
                        dev_change_flags(cpriv->dev, flags | IFF_UP);
                }
-               mutex_unlock(&priv->vlan_mutex);
+               up_read(&priv->vlan_rwsem);
        }
 
        netif_start_queue(dev);
@@ -162,7 +162,7 @@ static int ipoib_stop(struct net_device *dev)
                struct ipoib_dev_priv *cpriv;
 
                /* Bring down any child interfaces too */
-               mutex_lock(&priv->vlan_mutex);
+               down_read(&priv->vlan_rwsem);
                list_for_each_entry(cpriv, &priv->child_intfs, list) {
                        int flags;
 
@@ -172,7 +172,7 @@ static int ipoib_stop(struct net_device *dev)
 
                        dev_change_flags(cpriv->dev, flags & ~IFF_UP);
                }
-               mutex_unlock(&priv->vlan_mutex);
+               up_read(&priv->vlan_rwsem);
        }
 
        return 0;
@@ -1372,7 +1372,7 @@ void ipoib_setup(struct net_device *dev)
 
        spin_lock_init(&priv->lock);
 
-       mutex_init(&priv->vlan_mutex);
+       init_rwsem(&priv->vlan_rwsem);
 
        INIT_LIST_HEAD(&priv->path_list);
        INIT_LIST_HEAD(&priv->child_intfs);