linux-kernel - RE: [Open-FCoE] [PATCH 2/4] drivers/scsi/fcoe/fcoe.c: add missing test

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Message-ID: <Pine.LNX.4.64.1108231032510.25811@ask.diku.dk>
Date:	Tue, 23 Aug 2011 10:33:12 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	"Zou, Yi" <yi.zou@...el.com>
Cc:	Jesper Juhl <jj@...osbits.net>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	"devel@...n-fcoe.org" <devel@...n-fcoe.org>
Subject: RE: [Open-FCoE] [PATCH 2/4] drivers/scsi/fcoe/fcoe.c: add missing
 test

On Tue, 23 Aug 2011, Zou, Yi wrote:

> > From nobody Mon Aug 22 15:57:42 CEST 2011
> > From: Julia Lawall <julia@...u.dk>
> > To: Robert Love <robert.w.love@...el.com>
> > Cc: "James E.J. Bottomley" <JBottomley@...allels.com>,devel@...n-
> > fcoe.org,linux-scsi@...r.kernel.org,linux-kernel@...r.kernel.org
> > Subject: [PATCH 2/4] drivers/scsi/fcoe/fcoe.c: add missing test
> > 
> > From: Julia Lawall <julia@...u.dk>
> > 
> > The initializations of both fcoe_nport_scsi_transport and
> > fcoe_vport_scsi_transport can fail, so test both of them.
> > 
> > The semantic match that finds this problem is as follows:
> > (http://coccinelle.lip6.fr/)
> > 
> > // <smpl>
> > @r@
> > identifier x,y,f!={PTR_ERR,ERR_PTR,ERR_CAST};
> > statement S;
> > @@
> > 
> > x = f(...);
> > (
> > if (\(x == NULL\|IS_ERR(x)\)) S
> > |
> > *if (\(y == NULL\|IS_ERR(y)\))
> >  { ... when != x
> >    return ...; }
> > )
> > // </smpl>
> > 
> > Signed-off-by: Julia Lawall <julia@...u.dk>
> > 
> > ---
> >  drivers/scsi/fcoe/fcoe.c |   13 +++++++++++--
> >  1 file changed, 11 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/scsi/fcoe/fcoe.c b/drivers/scsi/fcoe/fcoe.c
> > index ba710e3..9f2e2f4 100644
> > --- a/drivers/scsi/fcoe/fcoe.c
> > +++ b/drivers/scsi/fcoe/fcoe.c
> > @@ -1093,11 +1093,20 @@ static int __init fcoe_if_init(void)
> >  	/* attach to scsi transport */
> >  	fcoe_nport_scsi_transport =
> >  		fc_attach_transport(&fcoe_nport_fc_functions);
> > +
> > +	if (!fcoe_nport_scsi_transport) {
> > +		printk(KERN_ERR
> > +		       "fcoe_nport: Failed to attach to the FC transport\n");
> > +		return -ENODEV;
> > +	}
> > +
> >  	fcoe_vport_scsi_transport =
> >  		fc_attach_transport(&fcoe_vport_fc_functions);
> > 
> > -	if (!fcoe_nport_scsi_transport) {
> > -		printk(KERN_ERR "fcoe: Failed to attach to the FC
> > transport\n");
> > +	if (!fcoe_vport_scsi_transport) {
> > +		printk(KERN_ERR
> > +		       "fcoe_vport: Failed to attach to the FC transport\n");
> > +		fc_release_transport(fcoe_nport_scsi_transport);
> >  		return -ENODEV;
> >  	}
> > 
> 
> I understand we were using -ENODEV before, but -ENOMEM is preferred here 
> as that's the only err from fc_attach_transport.

OK, I'll fix it.  Thanks.

julia
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