1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
index 29bac5118877..d409495876f1 100644
--- a/drivers/xen/xenbus/xenbus_probe.c
+++ b/drivers/xen/xenbus/xenbus_probe.c
@@ -755,7 +755,10 @@ int register_xenstore_notifier(struct notifier_block *nb)
 {
         int ret = 0;
 
-        blocking_notifier_chain_register(&xenstore_chain, nb);
+        if (xenstored_ready > 0)
+                ret = nb->notifier_call(nb, 0, NULL);
+        else
+                blocking_notifier_chain_register(&xenstore_chain, nb);
 
         return ret;
 }
@@ -769,7 +772,7 @@ EXPORT_SYMBOL_GPL(unregister_xenstore_notifier);
 
 void xenbus_probe(struct work_struct *unused)
 {
-        BUG_ON((xenstored_ready <= 0));
+        xenstored_ready = 1;
 
         /* Enumerate devices in xenstore and watch for changes. */
         xenbus_probe_devices(&xenbus_frontend);
@@ -835,8 +838,8 @@ static int __init xenbus_init(void)
                         xen_store_evtchn = xen_start_info->store_evtchn;
                         xen_store_mfn = xen_start_info->store_mfn;
                         xen_store_interface = mfn_to_virt(xen_store_mfn);
+                        xenstored_ready = 1;
                 }
-                xenstored_ready = 1;
         }
 
         /* Initialize the interface to xenstore. */