linux-kernel - Re: [PATCH v2 -next] platform/x86: intel-ips: fix 'passing zero to PTR

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Message-ID: <20181126133757.GJ10650@smile.fi.intel.com>
Date:   Mon, 26 Nov 2018 15:37:57 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     YueHaibing <yuehaibing@...wei.com>
Cc:     dvhart@...radead.org, andy@...radead.org, jkosina@...e.cz,
        linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH v2 -next] platform/x86: intel-ips: fix 'passing zero to
 PTR_ERR()' warning

On Mon, Nov 26, 2018 at 09:19:48PM +0800, YueHaibing wrote:
> Fix a static code checker warning:
> drivers/platform/x86/intel_ips.c:1314
>  ips_debugfs_init() warn: passing zero to 'PTR_ERR'
> drivers/platform/x86/intel_ips.c:1328
>  ips_debugfs_init() warn: passing zero to 'PTR_ERR'
> 
> If error occurs,debugfs_create_dir/debugfs_create_file
> return NULL while debugfs is enabled, which should not
> passing to PTR_ERR.
> 

Thanks for a patch.
Though the better approach as Greg KH explained [1] is to get rid of unnecessary checks.

[1]: https://lkml.org/lkml/2015/8/15/114

> Fixes: aa7ffc01d254 ("x86 platform driver: intelligent power sharing driver")
> Signed-off-by: YueHaibing <yuehaibing@...wei.com>
> ---
> v2:Fix typo in patch log and title
> ---
>  drivers/platform/x86/intel_ips.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/platform/x86/intel_ips.c b/drivers/platform/x86/intel_ips.c
> index 225638a..a5d1a68 100644
> --- a/drivers/platform/x86/intel_ips.c
> +++ b/drivers/platform/x86/intel_ips.c
> @@ -1311,8 +1311,7 @@ static void ips_debugfs_init(struct ips_driver *ips)
>  
>  	ips->debug_root = debugfs_create_dir("ips", NULL);
>  	if (!ips->debug_root) {
> -		dev_err(ips->dev, "failed to create debugfs entries: %ld\n",
> -			PTR_ERR(ips->debug_root));
> +		dev_err(ips->dev, "failed to create debugfs entries\n")
>  		return;
>  	}
>  
> @@ -1325,8 +1324,7 @@ static void ips_debugfs_init(struct ips_driver *ips)
>  					  ips->debug_root, node,
>  					  &ips_debugfs_ops);
>  		if (!ent) {
> -			dev_err(ips->dev, "failed to create debug file: %ld\n",
> -				PTR_ERR(ent));
> +			dev_err(ips->dev, "failed to create debug file\n");
>  			goto err_cleanup;
>  		}
>  	}
> -- 
> 2.7.0
> 
> 

-- 
With Best Regards,
Andy Shevchenko