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

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Date:   Sun, 29 Jul 2018 08:30:40 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     xiliang@...hat.com
Cc:     netdev@...r.kernel.org, xen-devel@...ts.xenproject.org,
        jgross@...e.com, boris.ostrovsky@...cle.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xen-netfront: wait xenbus state change when load
 module manually

From: Xiao Liang <xiliang@...hat.com>
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?

Thank you.