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

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Date:	Tue, 23 Aug 2011 00:23:15 -0700
From:	"Zou, Yi" <yi.zou@...el.com>
To:	Julia Lawall <julia@...u.dk>, Jesper Juhl <jj@...osbits.net>
CC:	"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

> 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.

Thanks,
yi

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