[PATCH] drivers/mtd/devices/spear_smi.c: failure test for null rather than negative integer

[PATCH] drivers/mtd/devices/spear_smi.c: failure test for null rather than negative integer

[Julia Lawall]

From: Julia Lawall <Julia.Lawall@lip6.fr>

dev_get_platdata returns a pointer, so the failure value would be NULL
rather than a negative integer.

The semantic match that finds this problem is: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression x,e;
statement S1,S2;
@@

*x = dev_get_platdata(...)
... when != x = e
*if (x < 0) S1 else S2
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>

---
 drivers/mtd/devices/spear_smi.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/devices/spear_smi.c b/drivers/mtd/devices/spear_smi.c
index b85f183..7c10466 100644
--- a/drivers/mtd/devices/spear_smi.c
+++ b/drivers/mtd/devices/spear_smi.c
@@ -935,7 +935,7 @@ static int __devinit spear_smi_probe(struct platform_device *pdev)
 		}
 	} else {
 		pdata = dev_get_platdata(&pdev->dev);
-		if (pdata < 0) {
+		if (!pdata) {
 			ret = -ENODEV;
 			dev_err(&pdev->dev, "no platform data\n");
 			goto err;

Re: [PATCH] drivers/mtd/devices/spear_smi.c: failure test for null rather than negative integer

[viresh kumar]

Adding spear-devel mailing list in cc.

@Shiraz: Can you update ST's mailing list address in entire MAINTAINERS file, so
that people can include ST's list easily?

On 11/07/12 09:58, Julia Lawall wrote:
> From: Julia Lawall <Julia.Lawall@lip6.fr>
>
> dev_get_platdata returns a pointer, so the failure value would be NULL
> rather than a negative integer.
>
> The semantic match that finds this problem is: (http://coccinelle.lip6.fr/)
>
> // <smpl>
> @@
> expression x,e;
> statement S1,S2;
> @@
>
> *x = dev_get_platdata(...)
> ... when != x = e
> *if (x < 0) S1 else S2
> // </smpl>
>
> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
>
> ---
>  drivers/mtd/devices/spear_smi.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/mtd/devices/spear_smi.c b/drivers/mtd/devices/spear_smi.c
> index b85f183..7c10466 100644
> --- a/drivers/mtd/devices/spear_smi.c
> +++ b/drivers/mtd/devices/spear_smi.c
> @@ -935,7 +935,7 @@ static int __devinit spear_smi_probe(struct platform_device *pdev)
>               }
>       } else {
>               pdata = dev_get_platdata(&pdev->dev);
> -             if (pdata < 0) {
> +             if (!pdata) {
>                       ret = -ENODEV;
>                       dev_err(&pdev->dev, "no platform data\n");
>                       goto err;

Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>

--
Viresh

-- IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium.  Thank you.

Re: [PATCH] drivers/mtd/devices/spear_smi.c: failure test for null rather than negative integer

[Stefan Roese]

On Wednesday 11 July 2012 10:58:38 Julia Lawall wrote:
> From: Julia Lawall <Julia.Lawall@lip6.fr>
> 
> dev_get_platdata returns a pointer, so the failure value would be NULL
> rather than a negative integer.
> 
> The semantic match that finds this problem is: (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @@
> expression x,e;
> statement S1,S2;
> @@
> 
> *x = dev_get_platdata(...)
> ... when != x = e
> *if (x < 0) S1 else S2
> // </smpl>
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>

Acked-by: Stefan Roese <sr@denx.de>
 
Thanks,
Stefan

Re: [PATCH] drivers/mtd/devices/spear_smi.c: failure test for null rather than negative integer

[Artem Bityutskiy]

[-- Attachment #1: Type: text/plain, Size: 370 bytes --]

On Wed, 2012-07-11 at 10:58 +0200, Julia Lawall wrote:
> From: Julia Lawall <Julia.Lawall@lip6.fr>
> 
> dev_get_platdata returns a pointer, so the failure value would be NULL
> rather than a negative integer.
> 
> The semantic match that finds this problem is: (http://coccinelle.lip6.fr/)

Pushed to l2-mtd.git, thanks!

-- 
Best Regards,
Artem Bityutskiy

[-- Attachment #2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 836 bytes --]