IPoIB: change init sequence ordering

In preparation for using per device work queues, we need to move the
start of the neighbor thread task to after ipoib_ib_dev_init and move
the destruction of the neighbor task to before ipoib_ib_dev_cleanup.
Otherwise we will end up freeing our workqueue with work possibly
still on it.

Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index 58b5aa3b6f2dded5d2e6d15aff080551aa9eddd9..2cf81ef51412d7d5d47e4756f96d7a588bd08835 100644 (file)
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -1262,15 +1262,13 @@ int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
 {
        struct ipoib_dev_priv *priv = netdev_priv(dev);
 
-       if (ipoib_neigh_hash_init(priv) < 0)
-               goto out;
        /* Allocate RX/TX "rings" to hold queued skbs */
        priv->rx_ring = kzalloc(ipoib_recvq_size * sizeof *priv->rx_ring,
                                GFP_KERNEL);
        if (!priv->rx_ring) {
                printk(KERN_WARNING "%s: failed to allocate RX ring (%d entries)\n",
                       ca->name, ipoib_recvq_size);
-               goto out_neigh_hash_cleanup;
+               goto out;
        }
 
        priv->tx_ring = vzalloc(ipoib_sendq_size * sizeof *priv->tx_ring);
@@ -1285,16 +1283,24 @@ int ipoib_dev_init(struct net_device *dev, struct ib_device *ca, int port)
        if (ipoib_ib_dev_init(dev, ca, port))
                goto out_tx_ring_cleanup;
 
+       /*
+        * Must be after ipoib_ib_dev_init so we can allocate a per
+        * device wq there and use it here
+        */
+       if (ipoib_neigh_hash_init(priv) < 0)
+               goto out_dev_uninit;
+
        return 0;
 
+out_dev_uninit:
+       ipoib_ib_dev_cleanup();
+
 out_tx_ring_cleanup:
        vfree(priv->tx_ring);
 
 out_rx_ring_cleanup:
        kfree(priv->rx_ring);
 
-out_neigh_hash_cleanup:
-       ipoib_neigh_hash_uninit(dev);
 out:
        return -ENOMEM;
 }
@@ -1317,6 +1323,12 @@ void ipoib_dev_cleanup(struct net_device *dev)
        }
        unregister_netdevice_many(&head);
 
+       /*
+        * Must be before ipoib_ib_dev_cleanup or we delete an in use
+        * work queue
+        */
+       ipoib_neigh_hash_uninit(dev);
+
        ipoib_ib_dev_cleanup(dev);
 
        kfree(priv->rx_ring);
@@ -1324,8 +1336,6 @@ void ipoib_dev_cleanup(struct net_device *dev)
 
        priv->rx_ring = NULL;
        priv->tx_ring = NULL;
-
-       ipoib_neigh_hash_uninit(dev);
 }
 
 static const struct header_ops ipoib_header_ops = {