linux-kernel - [PATCH] drivers/virtio/virtio

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Date:	Mon, 17 Sep 2012 19:31:17 +0200
From:	Peter Senna Tschudin <peter.senna@...il.com>
To:	rusty@...tcorp.com.au
Cc:	mst@...hat.com, virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	Peter Senna Tschudin <peter.senna@...il.com>
Subject: [PATCH] drivers/virtio/virtio_pci.c: fix error return code

From: Peter Senna Tschudin <peter.senna@...il.com>

Convert a nonnegative error return code to a negative one, as returned
elsewhere in the function.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
(
if@p1 (\(ret < 0\|ret != 0\))
 { ... return ret; }
|
ret@p1 = 0
)
... when != ret = e1
    when != &ret
*if(...)
{
  ... when != ret = e2
      when forall
 return ret;
}
// </smpl>

Signed-off-by: Peter Senna Tschudin <peter.senna@...il.com>
---
 drivers/virtio/virtio_pci.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
index 42b2076..c33aea3 100644
--- a/drivers/virtio/virtio_pci.c
+++ b/drivers/virtio/virtio_pci.c
@@ -719,8 +719,10 @@ static int __devinit virtio_pci_probe(struct pci_dev *pci_dev,
 		goto out_enable_device;
 
 	vp_dev->ioaddr = pci_iomap(pci_dev, 0, 0);
-	if (vp_dev->ioaddr == NULL)
+	if (vp_dev->ioaddr == NULL) {
+		err = -ENOMEM;
 		goto out_req_regions;
+	}
 
 	pci_set_drvdata(pci_dev, vp_dev);
 	pci_set_master(pci_dev);
-- 
1.7.11.4

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