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| author | David Vrabel <david.vrabel@citrix.com> | 2012-09-21 17:04:24 +0100 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2012-10-04 11:30:29 -0400 |
| commit | 9b6934a3b449266850149b717597408354039e95 (patch) | |
| tree | b78cd5db43f49c88afa9ee27e1a7a4ff8e196334 /drivers/tty/hvc | |
| parent | 4ed5978bdd99114db7773cb3d78f2998bd17f694 (diff) | |
| download | linux-3.10-9b6934a3b449266850149b717597408354039e95.tar.gz linux-3.10-9b6934a3b449266850149b717597408354039e95.tar.bz2 linux-3.10-9b6934a3b449266850149b717597408354039e95.zip | |
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/hvc')
| -rw-r--r-- | drivers/tty/hvc/hvc_xen.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/tty/hvc/hvc_xen.c b/drivers/tty/hvc/hvc_xen.c index 2944ff88fdc..f4abfe238f9 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; |