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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 <xiliang@xxxxxxxxxx>
Date: Fri, 27 Jul 2018 17:56:08 +0800

@@ -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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