3.2.87-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Boris Ostrovsky <boris.ostrov...@oracle.com>
commit 74470954857c264168d2b5a113904cf0cfd27d18 upstream.
rx_refill_timer should be deleted as soon as we disconnect from the
backend since otherwise it is possible for the timer to go off before
we get to xennet_destroy_queues(). If this happens we may dereference
queue->rx.sring which is set to NULL in xennet_disconnect_backend().
Signed-off-by: Boris Ostrovsky <boris.ostrov...@oracle.com>
Reviewed-by: Juergen Gross <jgr...@suse.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
[bwh: Backported to 3.2: there's only one RX queue here, and del_timer_sync()
was called from xennet_remove() but that's also too late]
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -1404,6 +1404,8 @@ static void xennet_disconnect_backend(st
spin_unlock_irq(&info->tx_lock);
spin_unlock_bh(&info->rx_lock);
+ del_timer_sync(&info->rx_refill_timer);
+
if (info->netdev->irq)
unbind_from_irqhandler(info->netdev->irq, info->netdev);
info->evtchn = info->netdev->irq = 0;
@@ -1940,8 +1942,6 @@ static int __devexit xennet_remove(struc
unregister_netdev(info->netdev);
- del_timer_sync(&info->rx_refill_timer);
-
free_percpu(info->stats);
free_netdev(info->netdev);
