linux-kernel - Re: [PATCH][V2] drivers/base/cpu: remove redundant assignment of variable retval

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Date:   Fri, 19 Feb 2021 14:46:08 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Colin King <colin.king@...onical.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        kernel-janitors@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][V2] drivers/base/cpu: remove redundant assignment of
 variable retval

On Thu, Feb 18, 2021 at 9:28 PM Colin King <colin.king@...onical.com> wrote:
>
> From: Colin Ian King <colin.king@...onical.com>
>
> The variable retval is being initialized with a value that is never read
> and it is being updated later with a new value.  Clean this up by
> initializing retval to -ENOMEM and remove the assignment to retval
> on the !dev failure path.
>
> Kudos to Rafael for the improved fix suggestion.
>
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

> ---
> V1: Remove initialization of retval
> V2: Initialiation of retval with -ENOMEM and remove assignment in
>     !dev failure path.
> ---
>  drivers/base/cpu.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
> index 8f1d6569564c..2b9e41377a07 100644
> --- a/drivers/base/cpu.c
> +++ b/drivers/base/cpu.c
> @@ -409,13 +409,11 @@ __cpu_device_create(struct device *parent, void *drvdata,
>                     const char *fmt, va_list args)
>  {
>         struct device *dev = NULL;
> -       int retval = -ENODEV;
> +       int retval = -ENOMEM;
>
>         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
> -       if (!dev) {
> -               retval = -ENOMEM;
> +       if (!dev)
>                 goto error;
> -       }
>
>         device_initialize(dev);
>         dev->parent = parent;
> --
> 2.30.0
>