netdev - RE: [PATCH net-next v4] Don't destroy the netdev until the vif is shut down

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Date:	Fri, 20 Sep 2013 08:10:25 +0000
From:	Paul Durrant <Paul.Durrant@...rix.com>
To:	David Miller <davem@...emloft.net>
CC:	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	David Vrabel <david.vrabel@...rix.com>,
	Wei Liu <wei.liu2@...rix.com>,
	Ian Campbell <Ian.Campbell@...rix.com>
Subject: RE: [PATCH net-next v4] Don't destroy the netdev until the vif is
 shut down

> -----Original Message-----
> From: David Miller [mailto:davem@...emloft.net]
> Sent: 19 September 2013 19:05
> To: Paul Durrant
> Cc: xen-devel@...ts.xen.org; netdev@...r.kernel.org; David Vrabel; Wei Liu;
> Ian Campbell
> Subject: Re: [PATCH net-next v4] Don't destroy the netdev until the vif is
> shut down
> 
> From: Paul Durrant <paul.durrant@...rix.com>
> Date: Tue, 17 Sep 2013 17:46:08 +0100
> 
> > Without this patch, if a frontend cycles through states Closing
> > and Closed (which Windows frontends need to do) then the netdev
> > will be destroyed and requires re-invocation of hotplug scripts
> > to restore state before the frontend can move to Connected. Thus
> > when udev is not in use the backend gets stuck in InitWait.
> >
> > With this patch, the netdev is left alone whilst the backend is
> > still online and is only de-registered and freed just prior to
> > destroying the vif (which is also nicely symmetrical with the
> > netdev allocation and registration being done during probe) so
> > no re-invocation of hotplug scripts is required.
> >
> > Signed-off-by: Paul Durrant <paul.durrant@...rix.com>
> 
> I think all of the testing requests have been satisfied so I have
> applied this.
> 
> But _please_ write a more proper subject line in future patch
> submissions.  You have to provide a subsystem prefix in the
> subject line, here I added "xen-netback: ", otherwise someone
> skimming the shortlog has no idea what area of code this change
> touches.
> 

Ok. Will do. Thanks,

  Paul
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