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authorDavid Vrabel <david.vrabel@citrix.com>2012-09-21 17:04:24 +0100
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2012-10-04 11:30:29 -0400
commit9b6934a3b449266850149b717597408354039e95 (patch)
treeb78cd5db43f49c88afa9ee27e1a7a4ff8e196334 /drivers/tty
parent4ed5978bdd99114db7773cb3d78f2998bd17f694 (diff)
xen/hvc: handle backend CLOSED without CLOSING
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> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/hvc/hvc_xen.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/tty/hvc/hvc_xen.c b/drivers/tty/hvc/hvc_xen.c
index 2944ff88fdc0..f4abfe238f98 100644
--- a/drivers/tty/hvc/hvc_xen.c
+++ b/drivers/tty/hvc/hvc_xen.c
@@ -478,7 +478,6 @@ static void xencons_backend_changed(struct xenbus_device *dev,
case XenbusStateInitialising:
case XenbusStateInitialised:
case XenbusStateUnknown:
- case XenbusStateClosed:
break;
case XenbusStateInitWait:
@@ -488,6 +487,10 @@ static void xencons_backend_changed(struct xenbus_device *dev,
xenbus_switch_state(dev, XenbusStateConnected);
break;
+ case XenbusStateClosed:
+ if (dev->state == XenbusStateClosed)
+ break;
+ /* Missed the backend's CLOSING state -- fallthrough */
case XenbusStateClosing:
xenbus_frontend_closed(dev);
break;