[PATCH] xen/pvcalls-back: test for errors when calling backend_connect()

[Juergen Gross <jgross@xxxxxxxx>]

backend_connect() can fail, so switch the device to connected only if
no error occurred.

Fixes: 0a9c75c2c7258f2 ("xen/pvcalls: xenbus state handling")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 drivers/xen/pvcalls-back.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/xen/pvcalls-back.c b/drivers/xen/pvcalls-back.c
index cf4ce3e9358d..41a18ece029a 100644
--- a/drivers/xen/pvcalls-back.c
+++ b/drivers/xen/pvcalls-back.c
@@ -1088,7 +1088,8 @@ static void set_backend_state(struct xenbus_device *dev,
                case XenbusStateInitialised:
                        switch (state) {
                        case XenbusStateConnected:
-                               backend_connect(dev);
+                               if (backend_connect(dev))
+                                       return;
                                xenbus_switch_state(dev, XenbusStateConnected);
                                break;
                        case XenbusStateClosing:
-- 
2.26.1