Re: [PATCH -next] video: fbdev: imxfb: fix return value check in imxfb_probe()

[Yang Yingliang]

Hi,

On 2022/7/31 7:18, Uwe Kleine-König wrote:
> Hello,
>
> On Fri, Jul 29, 2022 at 10:41:34AM +0800, Yang Yingliang wrote:
> > If devm_ioremap_resource() fails, it never return NULL, replace
> > NULL test with IS_ERR().
> Oh, thanks for cleanup up behind me. Did you find this using some static
> analysis tool? I would consider it interesting and fair to mention this
> in the commit log.
I found it by coccicheck like this:

@@
expression ret, E;
@@
ret = \(devm_ioremap_resource\)(...);
... when != ret = E
    when != IS_ERR(ret)
(
 ret == NULL || IS_ERR(ret)
|
 IS_ERR(ret) || ret == NULL
|
 ret != NULL && !IS_ERR(ret)
|
 !IS_ERR(ret) && ret != NULL
|
- ret == NULL
+ IS_ERR(ret)
|
- ret != NULL
+ !IS_ERR(ret)
)

Thanks,
Yang
> Best regards
> Uwe