linux-kernel - [PATCH 2/2] drivers/net/ax88796.c: Return error code in failure

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Message-Id: <1287411074-19825-2-git-send-email-julia@diku.dk>
Date:	Mon, 18 Oct 2010 16:11:14 +0200
From:	Julia Lawall <julia@...u.dk>
To:	Paul Gortmaker <p_gortmaker@...oo.com>
Cc:	kernel-janitors@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] drivers/net/ax88796.c: Return error code in failure

In this code, 0 is returned on failure, even though other
failures return -ENOMEM or other similar values.

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

// <smpl>
@a@
identifier alloc;
identifier ret;
constant C;
expression x;
@@

x = alloc(...);
if (x == NULL) { <+... \(ret = -C; \| return -C; \) ...+> }

@@
identifier f, a.alloc;
expression ret;
expression x,e1,e2,e3;
@@

ret = 0
... when != ret = e1
*x = alloc(...)
... when != ret = e2
if (x == NULL) { ... when != ret = e3
  return ret;
}
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
Another call to platform_get_resource in the same function uses -ENXIO, so
I have used the same value here.

 drivers/net/ax88796.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ax88796.c b/drivers/net/ax88796.c
index 20e946b..b6da4cf 100644
--- a/drivers/net/ax88796.c
+++ b/drivers/net/ax88796.c
@@ -864,6 +864,7 @@ static int ax_probe(struct platform_device *pdev)
 	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 	if (res == NULL) {
 		dev_err(&pdev->dev, "no IRQ specified\n");
+		ret = -ENXIO;
 		goto exit_mem;
 	}
 

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