xen: wait up to 5 minutes for device connetion

Increases the device timeout from 10s to 5 minutes, giving the user a
visual indication during that time in case there are problems.  The patch
is a backport of changesets 144 and 150 in 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>

diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
index 9246a8c..649fcdf 100644 (file)
--- a/drivers/xen/xenbus/xenbus_probe.c
+++ b/drivers/xen/xenbus/xenbus_probe.c
@@ -901,7 +901,7 @@ static int print_device_status(struct device *dev, void *data)
 static int ready_to_wait_for_devices;
 
 /*
- * On a 10 second timeout, wait for all devices currently configured.  We need
+ * On a 5-minute timeout, wait for all devices currently configured.  We need
  * to do this to guarantee that the filesystems and / or network devices
  * needed for boot are available, before we can allow the boot to proceed.
  *
@@ -916,18 +916,30 @@ static int ready_to_wait_for_devices;
  */
 static void wait_for_devices(struct xenbus_driver *xendrv)
 {
-       unsigned long timeout = jiffies + 10*HZ;
+       unsigned long start = jiffies;
        struct device_driver *drv = xendrv ? &xendrv->driver : NULL;
+       unsigned int seconds_waited = 0;
 
        if (!ready_to_wait_for_devices || !xen_domain())
                return;
 
        while (exists_connecting_device(drv)) {
-               if (time_after(jiffies, timeout))
-                       break;
+               if (time_after(jiffies, start + (seconds_waited+5)*HZ)) {
+                       if (!seconds_waited)
+                               printk(KERN_WARNING "XENBUS: Waiting for "
+                                      "devices to initialise: ");
+                       seconds_waited += 5;
+                       printk("%us...", 300 - seconds_waited);
+                       if (seconds_waited == 300)
+                               break;
+               }
+
                schedule_timeout_interruptible(HZ/10);
        }
 
+       if (seconds_waited)
+               printk("\n");
+
        bus_for_each_dev(&xenbus_frontend.bus, NULL, drv,
                         print_device_status);
 }