From 8791971a999520f89df72f8d72b9c498346278be Mon Sep 17 00:00:00 2001
From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Date: Mon, 30 Jan 2017 12:45:46 -0500
Subject: [PATCH] xen-netfront: Delete rx_refill_timer in
 xennet_disconnect_backend()

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.ostrovsky@oracle.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: David S. Miller <davem@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 <ben@decadent.org.uk>
---
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