IB/IPoIB: Disable bottom half when dealing with device address

Align locking usage when touching device address with rest
of the kernel. Lock the bottom half when doing so using
netif_addr_lock_bh.

This also solves the following case as reported by lockdep:
	CPU0                    CPU1
	----                    ----
lock(_xmit_INFINIBAND);
				local_irq_disable();
				lock(&(&mc->mca_lock)->rlock);
				lock(_xmit_INFINIBAND);
<Interrupt>
lock(&(&mc->mca_lock)->rlock);

*** DEADLOCK ***

Fixes: 492a7e67ff83 ("IB/IPoIB: Allow setting the device address")
Signed-off-by: Mark Bloch <markb@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
index 45c40a1..dc6d241 100644 (file)
--- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
@@ -1015,7 +1015,7 @@ static bool ipoib_dev_addr_changed_valid(struct ipoib_dev_priv *priv)
        if (ib_query_gid(priv->ca, priv->port, 0, &gid0, NULL))
                return false;
 
-       netif_addr_lock(priv->dev);
+       netif_addr_lock_bh(priv->dev);
 
        /* The subnet prefix may have changed, update it now so we won't have
         * to do it later
@@ -1026,12 +1026,12 @@ static bool ipoib_dev_addr_changed_valid(struct ipoib_dev_priv *priv)
 
        search_gid.global.interface_id = priv->local_gid.global.interface_id;
 
-       netif_addr_unlock(priv->dev);
+       netif_addr_unlock_bh(priv->dev);
 
        err = ib_find_gid(priv->ca, &search_gid, IB_GID_TYPE_IB,
                          priv->dev, &port, &index);
 
-       netif_addr_lock(priv->dev);
+       netif_addr_lock_bh(priv->dev);
 
        if (search_gid.global.interface_id !=
            priv->local_gid.global.interface_id)
@@ -1092,7 +1092,7 @@ static bool ipoib_dev_addr_changed_valid(struct ipoib_dev_priv *priv)
        }
 
 out:
-       netif_addr_unlock(priv->dev);
+       netif_addr_unlock_bh(priv->dev);
 
        return ret;
 }

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index 0aa52c2..248da50 100644 (file)
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -1851,7 +1851,7 @@ static void set_base_guid(struct ipoib_dev_priv *priv, union ib_gid *gid)
        struct ipoib_dev_priv *child_priv;
        struct net_device *netdev = priv->dev;
 
-       netif_addr_lock(netdev);
+       netif_addr_lock_bh(netdev);
 
        memcpy(&priv->local_gid.global.interface_id,
               &gid->global.interface_id,
@@ -1859,7 +1859,7 @@ static void set_base_guid(struct ipoib_dev_priv *priv, union ib_gid *gid)
        memcpy(netdev->dev_addr + 4, &priv->local_gid, sizeof(priv->local_gid));
        clear_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
 
-       netif_addr_unlock(netdev);
+       netif_addr_unlock_bh(netdev);
 
        if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
                down_read(&priv->vlan_rwsem);
@@ -1875,7 +1875,7 @@ static int ipoib_check_lladdr(struct net_device *dev,
        union ib_gid *gid = (union ib_gid *)(ss->__data + 4);
        int ret = 0;
 
-       netif_addr_lock(dev);
+       netif_addr_lock_bh(dev);
 
        /* Make sure the QPN, reserved and subnet prefix match the current
         * lladdr, it also makes sure the lladdr is unicast.
@@ -1885,7 +1885,7 @@ static int ipoib_check_lladdr(struct net_device *dev,
            gid->global.interface_id == 0)
                ret = -EINVAL;
 
-       netif_addr_unlock(dev);
+       netif_addr_unlock_bh(dev);
 
        return ret;
 }

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
index 82fbc94..d3394b6 100644 (file)
--- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
@@ -582,13 +582,13 @@ void ipoib_mcast_join_task(struct work_struct *work)
                return;
        }
        priv->local_lid = port_attr.lid;
-       netif_addr_lock(dev);
+       netif_addr_lock_bh(dev);
 
        if (!test_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags)) {
-               netif_addr_unlock(dev);
+               netif_addr_unlock_bh(dev);
                return;
        }
-       netif_addr_unlock(dev);
+       netif_addr_unlock_bh(dev);
 
        spin_lock_irq(&priv->lock);
        if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))