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

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Message-ID: <20130219095803.17b28ec3@hawk.usersys.redhat.com>
Date:	Tue, 19 Feb 2013 09:58:03 +0100
From:	Andrew Jones <drjones@...hat.com>
To:	"Jan Beulich" <JBeulich@...e.com>
Cc:	"David Miller" <davem@...emloft.net>, <ian.campbell@...rix.com>,
	<xen-devel@...ts.xensource.com>, <linux-kernel@...r.kernel.org>,
	<netdev@...r.kernel.org>, liuw@...w.name
Subject: Re: [Xen-devel] [PATCH] xen: netback: remove redundant xenvif_put

On Tue, 19 Feb 2013 08:03:49 +0000
"Jan Beulich" <JBeulich@...e.com> 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, 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()).

I see the balance described by Ian in [1] now. Sorry that I missed
that previous discussion and generated this noise.

[1] http://marc.info/?l=xen-devel&m=136084174026977&w=2

drew

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

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