Re: [Xen-devel] [PATCH] xen-netfront: wait xenbus state change when load module manually

Thanks, David

On 07/29/2018 11:30 PM, David Miller wrote:

From: Xiao Liang <redacted>
Date: Fri, 27 Jul 2018 17:56:08 +0800

quoted

@@ -1330,6 +1331,11 @@ static struct net_device *xennet_create_dev(struct xenbus_device *dev)
  	netif_carrier_off(netdev);
  
  	xenbus_switch_state(dev, XenbusStateInitialising);
+	wait_event(module_load_q,
+			   xenbus_read_driver_state(dev->otherend) !=
+			   XenbusStateClosed &&
+			   xenbus_read_driver_state(dev->otherend) !=
+			   XenbusStateUnknown);
  	return netdev;
  
   exit:

What performs the wakeups that will trigger for this sleep site?

In my understanding, backend leaving closed/unknow state can trigger the 
wakeups. I mean to make sure both sides are ready for creating connection.

Thanks,
Liang

Thank you.

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