This is a note to let you know that I've just added the patch titled
xen-netback: fix refcnt unbalance for 3.10
to the 3.10-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-fix-refcnt-unbalance-for-3.10.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From [email protected] Mon Dec 2 09:57:28 2013
From: Wei Liu <[email protected]>
Date: Mon, 2 Dec 2013 17:49:54 +0000
Subject: xen-netback: fix refcnt unbalance for 3.10
To: Greg KH <[email protected]>
Cc: Wei Liu <[email protected]>, <[email protected]>,
<[email protected]>, <[email protected]>,
<[email protected]>, Ian Campbell <[email protected]>, Konrad
Wilk <[email protected]>, David Vrabel <[email protected]>
Message-ID: <[email protected]>
Content-Disposition: inline
From: Wei Liu <[email protected]>
With the introduction of "xen-netback: Don't destroy the netdev until
the vif is shut down" (upstream commit id 279f438e36), vif disconnect
and free are separated. However in the backported version reference
counting code was not correctly modified, and the reset of vif->irq
was lost. If frontend goes through vif life cycle more than once the
reference counting is skewed.
This patch adds back the missing vif->irq reset line. It also moves
several lines of the reference counting code to vif_free, so the moved
code corresponds to the counterpart in vif_alloc, thus the reference
counting is balanced.
Signed-off-by: Wei Liu <[email protected]>
Acked-by: Ian Campbell <[email protected]>
Cc: Konrad Wilk <[email protected]>
Cc: David Vrabel <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/net/xen-netback/interface.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -365,17 +365,19 @@ void xenvif_disconnect(struct xenvif *vi
if (netif_carrier_ok(vif->dev))
xenvif_carrier_off(vif);
- atomic_dec(&vif->refcnt);
- wait_event(vif->waiting_to_free, atomic_read(&vif->refcnt) == 0);
-
- if (vif->irq)
+ if (vif->irq) {
unbind_from_irqhandler(vif->irq, vif);
+ vif->irq = 0;
+ }
xen_netbk_unmap_frontend_rings(vif);
}
void xenvif_free(struct xenvif *vif)
{
+ atomic_dec(&vif->refcnt);
+ wait_event(vif->waiting_to_free, atomic_read(&vif->refcnt) == 0);
+
unregister_netdev(vif->dev);
free_netdev(vif->dev);
Patches currently in stable-queue which might be from [email protected] are
queue-3.10/xen-netback-fix-refcnt-unbalance-for-3.10.patch
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