mlx4_core: Initialize ctx_list and ctx_lock earlier

We may call mlx4_dispatch_event() before mlx4_register_device() is
called for a device, because for example a catastrophic error happens
immediately after we enable interrupts.  Therefore priv->ctx_list and
priv->ctx_lock need to be initialized earlier.

This bug was actually exposed by the MSI-X bug that returned IRQ numbers 
to drivers in reverse order, so that the first FW command 
interrupt looked to mlx4 like a catastrophic error.
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/net/mlx4/intf.c

@@ -135,9 +135,6 @@ int mlx4_register_device(struct mlx4_dev *dev)
 	struct mlx4_priv *priv = mlx4_priv(dev);
 	struct mlx4_interface *intf;
 
-	INIT_LIST_HEAD(&priv->ctx_list);
-	spin_lock_init(&priv->ctx_lock);
-
 	mutex_lock(&intf_mutex);
 
 	list_add_tail(&priv->dev_list, &dev_list);

drivers/net/mlx4/main.c

@@ -787,6 +787,8 @@ static int __devinit mlx4_init_one(struct pci_dev *pdev,
 
 	dev       = &priv->dev;
 	dev->pdev = pdev;
+	INIT_LIST_HEAD(&priv->ctx_list);
+	spin_lock_init(&priv->ctx_lock);
 
 	/*
 	 * Now reset the HCA before we touch the PCI capabilities or