[Xen-devel] [PATCH net-next v2 2/2] xen-netback: handle frontends that fail to transition through Closing

[Paul Durrant <paul.durrant@xxxxxxxxxx>]

Some old Windows frontends fail to transition through the xenbus Closing
state and move directly from Connected to Closed. Handle this case properly.

Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
Cc: David Vrabel <david.vrabel@xxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 drivers/net/xen-netback/xenbus.c |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
index a53782e..684b0f6 100644
--- a/drivers/net/xen-netback/xenbus.c
+++ b/drivers/net/xen-netback/xenbus.c
@@ -265,6 +265,13 @@ static void frontend_changed(struct xenbus_device *dev,
                break;
 
        case XenbusStateClosed:
+               /*
+                * Handle frontends which erroneously transition
+                * directly from Connected to Closed.
+                */
+               if (dev->state == XenbusStateConnected)
+                       disconnect_backend(dev);
+
                xenbus_switch_state(dev, XenbusStateClosed);
                if (xenbus_dev_is_online(dev))
                        break;
-- 
1.7.10.4


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