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

[Xiao Liang]

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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