linux-kernel - Re: [PATCH] platform/chrome: cros_ec_debugfs: no need to check return value of debugfs

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Date:   Mon, 8 Apr 2019 08:18:42 -0700
From:   Guenter Roeck <groeck@...gle.com>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Gwendal Grignou <gwendal@...omium.org>,
        twawrzynczak@...omium.org, Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>, kernel@...labora.com,
        Dmitry Torokhov <dtor@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] platform/chrome: cros_ec_debugfs: no need to check return
 value of debugfs_create functions

On Mon, Apr 8, 2019 at 8:05 AM Enric Balletbo i Serra
<enric.balletbo@...labora.com> 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.
>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
>
>  drivers/platform/chrome/cros_ec_debugfs.c | 35 ++++-------------------
>  1 file changed, 6 insertions(+), 29 deletions(-)
>
> diff --git a/drivers/platform/chrome/cros_ec_debugfs.c b/drivers/platform/chrome/cros_ec_debugfs.c
> index f0de1991b688..a712508e4646 100644
> --- a/drivers/platform/chrome/cros_ec_debugfs.c
> +++ b/drivers/platform/chrome/cros_ec_debugfs.c
> @@ -337,12 +337,8 @@ static int cros_ec_create_console_log(struct cros_ec_debugfs *debug_info)
>         mutex_init(&debug_info->log_mutex);
>         init_waitqueue_head(&debug_info->log_wq);
>
> -       if (!debugfs_create_file("console_log",
> -                                S_IFREG | 0444,
> -                                debug_info->dir,
> -                                debug_info,
> -                                &cros_ec_console_log_fops))
> -               return -ENOMEM;
> +       debugfs_create_file("console_log", S_IFREG | 0444, debug_info->dir,
> +                           debug_info, &cros_ec_console_log_fops);
>
>         INIT_DELAYED_WORK(&debug_info->log_poll_work,
>                           cros_ec_console_log_work);
> @@ -390,13 +386,8 @@ static int cros_ec_create_panicinfo(struct cros_ec_debugfs *debug_info)
>         debug_info->panicinfo_blob.data = msg->data;
>         debug_info->panicinfo_blob.size = ret;
>
> -       if (!debugfs_create_blob("panicinfo",
> -                                S_IFREG | 0444,
> -                                debug_info->dir,
> -                                &debug_info->panicinfo_blob)) {
> -               ret = -ENOMEM;
> -               goto free;
> -       }
> +       debugfs_create_blob("panicinfo", S_IFREG | 0444, debug_info->dir,
> +                           &debug_info->panicinfo_blob);
>
>         return 0;
>
> @@ -405,15 +396,6 @@ static int cros_ec_create_panicinfo(struct cros_ec_debugfs *debug_info)
>         return ret;
>  }
>
> -static int cros_ec_create_pdinfo(struct cros_ec_debugfs *debug_info)
> -{
> -       if (!debugfs_create_file("pdinfo", 0444, debug_info->dir, debug_info,
> -                                &cros_ec_pdinfo_fops))
> -               return -ENOMEM;
> -
> -       return 0;
> -}
> -
>  static int cros_ec_debugfs_probe(struct platform_device *pd)
>  {
>         struct cros_ec_dev *ec = dev_get_drvdata(pd->dev.parent);
> @@ -428,8 +410,6 @@ static int cros_ec_debugfs_probe(struct platform_device *pd)
>
>         debug_info->ec = ec;
>         debug_info->dir = debugfs_create_dir(name, NULL);
> -       if (!debug_info->dir)
> -               return -ENOMEM;
>
>         ret = cros_ec_create_panicinfo(debug_info);
>         if (ret)
> @@ -439,9 +419,8 @@ static int cros_ec_debugfs_probe(struct platform_device *pd)
>         if (ret)
>                 goto remove_debugfs;
>
> -       ret = cros_ec_create_pdinfo(debug_info);
> -       if (ret)
> -               goto remove_log;
> +       debugfs_create_file("pdinfo", 0444, debug_info->dir, debug_info,
> +                           &cros_ec_pdinfo_fops);
>
>         ec->debug_info = debug_info;
>
> @@ -449,8 +428,6 @@ static int cros_ec_debugfs_probe(struct platform_device *pd)
>
>         return 0;
>
> -remove_log:
> -       cros_ec_cleanup_console_log(debug_info);
>  remove_debugfs:
>         debugfs_remove_recursive(debug_info->dir);
>         return ret;
> --
> 2.20.1
>