IPoIB: Fix AH leak at interface down

When ipoib_stop() is called it first calls netif_stop_queue() to stop
the kernel from passing more packets to the network driver. However,
the completion handler may call netif_wake_queue() re-enabling packet
transfer.

This might result in leaks (we see AH leaks which we think can be
attributed to this bug) as new packets get posted while the interface
is going down.

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

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
index a54da42849ae1e9e19d3335326be70fe3c44880b..8406839b91cf3879bff26215f08cd9addc7ab312 100644 (file)
--- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
@@ -275,6 +275,7 @@ static void ipoib_ib_handle_wc(struct net_device *dev,
                spin_lock_irqsave(&priv->tx_lock, flags);
                ++priv->tx_tail;
                if (netif_queue_stopped(dev) &&
+                   test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags) &&
                    priv->tx_head - priv->tx_tail <= ipoib_sendq_size >> 1)
                        netif_wake_queue(dev);
                spin_unlock_irqrestore(&priv->tx_lock, flags);