linux-kernel - Re: [Xen-devel] [PATCH] xen: netback: remove redundant xenvif

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Message-ID: <1361264324.1051.61.camel@zakaz.uk.xensource.com>
Date:	Tue, 19 Feb 2013 08:58:44 +0000
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Jan Beulich <JBeulich@...e.com>
CC:	David Miller <davem@...emloft.net>,
	"drjones@...hat.com" <drjones@...hat.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH] xen: netback: remove redundant xenvif_put

On Tue, 2013-02-19 at 08:03 +0000, Jan Beulich wrote:
> >>> On 19.02.13 at 06:53, David Miller <davem@...emloft.net> wrote:
> > From: Andrew Jones <drjones@...hat.com>
> > Date: Mon, 18 Feb 2013 21:29:20 +0100
> > 
> >> netbk_fatal_tx_err() calls xenvif_carrier_off(), which does
> >> a xenvif_put(). As callers of netbk_fatal_tx_err should only
> >> have one reference to the vif at this time, then the xenvif_put
> >> in netbk_fatal_tx_err is one too many.
> >> 
> >> Signed-off-by: Andrew Jones <drjones@...hat.com>
> > 
> > Applied.
> 
> But this is wrong from all we can tell,

Yes, please can this be reverted.

>  we discussed this before
> (Wei pointed to the discussion in an earlier reply). The core of
> it is that the put here parallels the one in netbk_tx_err(), and
> the one in xenvif_carrier_off() matches the get from
> xenvif_connect() (which normally would be done on the path
> coming through xenvif_disconnect()).

Perhaps Andrew was looking at the tree before "xen-netback: correctly
return errors from netbk_count_requests()" which fixed a different case
of a double put which may have appeared to be fixed by this change too.

Ian.

> And anyway - shouldn't changes to netback require an ack from
> Ian?
> 
> Jan
> 


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