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 10:42:41 +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

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.

Convert the return value to -ENOMEM to better reflect the reason for the 
error.

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 |   15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/fcoe/fcoe.c b/drivers/scsi/fcoe/fcoe.c
index ba710e3..2a279eb 100644
--- a/drivers/scsi/fcoe/fcoe.c
+++ b/drivers/scsi/fcoe/fcoe.c
@@ -1093,12 +1093,21 @@ 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 -ENOMEM;
+	}
+
 	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");
-		return -ENODEV;
+	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 -ENOMEM;
 	}
 
 	return 0;
--
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