xen: improvement to wait_for_devices()

When printing a warning about a timed-out device, print the
current state of both ends of the device connection (i.e., backend as
well as frontend).  This backports half of changeset 146 from the
Xenbits tree.

Cc: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
index 19bce3e1b333..9246a8c4ecf2 100644
--- a/drivers/xen/xenbus/xenbus_probe.c
+++ b/drivers/xen/xenbus/xenbus_probe.c
@@ -885,10 +885,13 @@ static int print_device_status(struct device *dev, void *data)
                 /* Information only: is this too noisy? */
                 printk(KERN_INFO "XENBUS: Device with no driver: %s\n",
                        xendev->nodename);
-        } else if (xendev->state != XenbusStateConnected) {
+        } else if (xendev->state < XenbusStateConnected) {
+                enum xenbus_state rstate = XenbusStateUnknown;
+                if (xendev->otherend)
+                        rstate = xenbus_read_driver_state(xendev->otherend);
                 printk(KERN_WARNING "XENBUS: Timeout connecting "
-                       "to device: %s (state %d)\n",
-                       xendev->nodename, xendev->state);
+                       "to device: %s (local state %d, remote state %d)\n",
+                       xendev->nodename, xendev->state, rstate);
         }
 
         return 0;