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xen-netfront: handle backend CLOSED without CLOSING

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Backend drivers shouldn't transistion to CLOSED unless the frontend is
CLOSED.  If a backend does transition to CLOSED too soon then the
frontend may not see the CLOSING state and will not properly shutdown.

So, treat an unexpected backend CLOSED state the same as CLOSING.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Vrabel 2014-02-04 18:50:26 +00:00 committed by David S. Miller
parent e8c37aff2a
commit bce3ea81d5
1 changed files with 4 additions and 1 deletions
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5
drivers/net/xen-netfront.c
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@ -1832,7 +1832,6 @@ static void netback_changed(struct xenbus_device *dev,
case XenbusStateReconfiguring:
case XenbusStateReconfigured:
case XenbusStateUnknown:
case XenbusStateClosed:
break;
case XenbusStateInitWait:
@ -1847,6 +1846,10 @@ static void netback_changed(struct xenbus_device *dev,
netdev_notify_peers(netdev);
break;
case XenbusStateClosed:
if (dev->state == XenbusStateClosed)
break;
/* Missed the backend's CLOSING state -- fallthrough */
case XenbusStateClosing:
xenbus_frontend_closed(dev);
break;