netdev - RE: [PATCH net-next 2/2] xen-netback: handle frontends that fail to transition through Closing

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Message-ID: <9AAE0902D5BC7E449B7C8E4E778ABCD010EFD7@AMSPEX01CL01.citrite.net>
Date:	Fri, 20 Sep 2013 13:38:33 +0000
From:	Paul Durrant <Paul.Durrant@...rix.com>
To:	Wei Liu <wei.liu2@...rix.com>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"xen-devel@...ts.xen.org" <xen-devel@...ts.xen.org>,
	David Vrabel <david.vrabel@...rix.com>,
	Wei Liu <wei.liu2@...rix.com>,
	Ian Campbell <Ian.Campbell@...rix.com>
Subject: RE: [PATCH net-next 2/2] xen-netback: handle frontends that fail to
 transition through Closing

> -----Original Message-----
> From: Wei Liu [mailto:wei.liu2@...rix.com]
> Sent: 20 September 2013 14:35
> To: Paul Durrant
> Cc: netdev@...r.kernel.org; xen-devel@...ts.xen.org; David Vrabel; Wei Liu;
> Ian Campbell
> Subject: Re: [PATCH net-next 2/2] xen-netback: handle frontends that fail to
> transition through Closing
> 
> On Fri, Sep 20, 2013 at 01:56:31PM +0100, Paul Durrant wrote:
> > Some old Windows frontends fail to transition through the xenbus Closing
> > state and move directly from Connected to Closed. Handle this case
> properly.
> >
> > Signed-off-by: Paul Durrant <paul.durrant@...rix.com>
> > Cc: David Vrabel <david.vrabel@...rix.com>
> > Cc: Wei Liu <wei.liu2@...rix.com>
> > Cc: Ian Campbell <ian.campbell@...rix.com>
> > ---
> >  drivers/net/xen-netback/xenbus.c |    2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-
> netback/xenbus.c
> > index a53782e..bcaa25b 100644
> > --- a/drivers/net/xen-netback/xenbus.c
> > +++ b/drivers/net/xen-netback/xenbus.c
> > @@ -265,6 +265,8 @@ static void frontend_changed(struct xenbus_device
> *dev,
> >  		break;
> >
> >  	case XenbusStateClosed:
> > +		if (dev->state == XenbusStateConnected)
> > +			disconnect_backend(dev);
> 
> Could you please add a comment above this change stating that this is a
> workaround for some old frontend that we cannot fix / upgrade.
> 
> We would still like to later frontend goes through the normal connected
> -> closing -> closed path.
> 

Sure. I'll re-post the series with that change.

  Paul
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