This is a note to let you know that I've just added the patch titled
xen-netback: cancel the credit timer when taking the vif down
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
xen-netback-cancel-the-credit-timer-when-taking-the-vif-down.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c702e3772a6f5464ec7d59affdbbb41c2e483f6b Mon Sep 17 00:00:00 2001
From: David Vrabel <david.vrabel@xxxxxxxxxx>
Date: Thu, 14 Feb 2013 03:18:58 +0000
Subject: xen-netback: cancel the credit timer when taking the vif down
From: David Vrabel <david.vrabel@xxxxxxxxxx>
[ Upstream commit 3e55f8b306cf305832a4ac78aa82e1b40e818ece ]
If the credit timer is left armed after calling
xen_netbk_remove_xenvif(), then it may fire and attempt to schedule
the vif which will then oops as vif->netbk == NULL.
This may happen both in the fatal error path and during normal
disconnection from the front end.
The sequencing during shutdown is critical to ensure that: a)
vif->netbk doesn't become unexpectedly NULL; and b) the net device/vif
is not freed.
1. Mark as unschedulable (netif_carrier_off()).
2. Synchronously cancel the timer.
3. Remove the vif from the schedule list.
4. Remove it from it netback thread group.
5. Wait for vif->refcnt to become 0.
Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Reported-by: Christopher S. Aker <caker@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/xen-netback/interface.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -132,6 +132,7 @@ static void xenvif_up(struct xenvif *vif
static void xenvif_down(struct xenvif *vif)
{
disable_irq(vif->irq);
+ del_timer_sync(&vif->credit_timeout);
xen_netbk_deschedule_xenvif(vif);
xen_netbk_remove_xenvif(vif);
}
@@ -362,8 +363,6 @@ void xenvif_disconnect(struct xenvif *vi
atomic_dec(&vif->refcnt);
wait_event(vif->waiting_to_free, atomic_read(&vif->refcnt) == 0);
- del_timer_sync(&vif->credit_timeout);
-
if (vif->irq)
unbind_from_irqhandler(vif->irq, vif);
Patches currently in stable-queue which might be from david.vrabel@xxxxxxxxxx are
queue-3.0/xen-netback-cancel-the-credit-timer-when-taking-the-vif-down.patch
queue-3.0/xen-netback-correctly-return-errors-from-netbk_count_requests.patch
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