linux-kernel - Re: [PATCH 1/8] platform: x86: acer-wmi: no need to check return value of debugfs

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Date:   Fri, 14 Jun 2019 09:48:04 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        "Lee, Chun-Yi" <jlee@...e.com>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/8] platform: x86: acer-wmi: no need to check return
 value of debugfs_create functions

On Wed, Jun 12, 2019 at 3:13 PM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> When calling debugfs functions, there is no need to ever check the
> return value.  The function can work or not, but the code logic should
> never do something different based on this.
>
> Also, because there is no need to save the file dentry, remove the
> variable that was saving it and just recursively delete the whole
> directory.
>

Through which tree you want to proceed this?

> Cc: "Lee, Chun-Yi" <jlee@...e.com>
> Cc: Darren Hart <dvhart@...radead.org>
> Cc: Andy Shevchenko <andy@...radead.org>
> Cc: platform-driver-x86@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  drivers/platform/x86/acer-wmi.c | 29 +++++------------------------
>  1 file changed, 5 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
> index 521b526cd467..f8f0e98b1f0b 100644
> --- a/drivers/platform/x86/acer-wmi.c
> +++ b/drivers/platform/x86/acer-wmi.c
> @@ -259,7 +259,6 @@ struct acer_data {
>
>  struct acer_debug {
>         struct dentry *root;
> -       struct dentry *devices;
>         u32 wmid_devices;
>  };
>
> @@ -2148,29 +2147,15 @@ static struct platform_device *acer_platform_device;
>
>  static void remove_debugfs(void)
>  {
> -       debugfs_remove(interface->debug.devices);
> -       debugfs_remove(interface->debug.root);
> +       debugfs_remove_recursive(interface->debug.root);
>  }
>
> -static int __init create_debugfs(void)
> +static void __init create_debugfs(void)
>  {
>         interface->debug.root = debugfs_create_dir("acer-wmi", NULL);
> -       if (!interface->debug.root) {
> -               pr_err("Failed to create debugfs directory");
> -               return -ENOMEM;
> -       }
>
> -       interface->debug.devices = debugfs_create_u32("devices", S_IRUGO,
> -                                       interface->debug.root,
> -                                       &interface->debug.wmid_devices);
> -       if (!interface->debug.devices)
> -               goto error_debugfs;
> -
> -       return 0;
> -
> -error_debugfs:
> -       remove_debugfs();
> -       return -ENOMEM;
> +       debugfs_create_u32("devices", S_IRUGO, interface->debug.root,
> +                          &interface->debug.wmid_devices);
>  }
>
>  static int __init acer_wmi_init(void)
> @@ -2300,9 +2285,7 @@ static int __init acer_wmi_init(void)
>
>         if (wmi_has_guid(WMID_GUID2)) {
>                 interface->debug.wmid_devices = get_wmid_devices();
> -               err = create_debugfs();
> -               if (err)
> -                       goto error_create_debugfs;
> +               create_debugfs();
>         }
>
>         /* Override any initial settings with values from the commandline */
> @@ -2310,8 +2293,6 @@ static int __init acer_wmi_init(void)
>
>         return 0;
>
> -error_create_debugfs:
> -       platform_device_del(acer_platform_device);
>  error_device_add:
>         platform_device_put(acer_platform_device);
>  error_device_alloc:
> --
> 2.22.0
>


-- 
With Best Regards,
Andy Shevchenko