netdev - Re: [PATCH net-next] hyperv: Add handler for RNDIS_STATUS_NETWORK

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Date:	Thu, 19 Jun 2014 22:12:13 -0700
From:	Greg KH <greg@...ah.com>
To:	Olaf Hering <olaf@...fle.de>
Cc:	Haiyang Zhang <haiyangz@...rosoft.com>, netdev@...r.kernel.org,
	jasowang@...hat.com, driverdev-devel@...uxdriverproject.org,
	linux-kernel@...r.kernel.org, davem@...emloft.net
Subject: Re: [PATCH net-next] hyperv: Add handler for
 RNDIS_STATUS_NETWORK_CHANGE event

On Fri, Jun 20, 2014 at 06:57:04AM +0200, Olaf Hering wrote:
> On Thu, Jun 19, Haiyang Zhang wrote:
> 
> > The RNDIS_STATUS_NETWORK_CHANGE event is received after the Hyper-V host
> > sleep or hibernation. We refresh network at this time.
> 
> > +	char *argv[] = { "/etc/init.d/network", "restart", NULL };
> 
> What happens if that file does not exist? Dead network in the guest?
> I tend to think if a VM with PV drivers goes to sleep it has to go
> through the whole suspend/resume cycle, very much like the "LID closed"
> event. So I think this and the other fbdev change that is floating
> around is wrong.

Ah, and what about systems with no /etc/init.d/ at all (like
systemd-based ones)?  You can't have a kernel driver ask userspace to
restart all networking connections, that seems really wrong.

greg k-h
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