linux-kernel - Re: [PATCH] Input: sc27xx-vibra - Make use of the helper function dev_err

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Message-ID: <CADBw62qkp-LrHf1MUgPmZ=X24G-gAvsjY1yLFNncT-toUjUyJA@mail.gmail.com>
Date:   Thu, 23 Sep 2021 22:17:04 +0800
From:   Baolin Wang <baolin.wang7@...il.com>
To:     Cai Huoqing <caihuoqing@...du.com>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Orson Zhai <orsonzhai@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        linux-input@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Input: sc27xx-vibra - Make use of the helper function dev_err_probe()

Hi,

On Thu, Sep 16, 2021 at 11:34 PM Cai Huoqing <caihuoqing@...du.com> wrote:
>
> When possible use dev_err_probe help to properly deal with the
> PROBE_DEFER error, the benefit is that DEFER issue will be logged
> in the devices_deferred debugfs file.
> Using dev_err_probe() can reduce code size, and the error value
> gets printed.
>
> Signed-off-by: Cai Huoqing <caihuoqing@...du.com>
> ---
>  drivers/input/misc/sc27xx-vibra.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/input/misc/sc27xx-vibra.c b/drivers/input/misc/sc27xx-vibra.c
> index 1478017f0968..7cf0a1354320 100644
> --- a/drivers/input/misc/sc27xx-vibra.c
> +++ b/drivers/input/misc/sc27xx-vibra.c
> @@ -135,10 +135,9 @@ static int sc27xx_vibra_probe(struct platform_device *pdev)
>         }
>
>         error = device_property_read_u32(&pdev->dev, "reg", &info->base);
> -       if (error) {
> -               dev_err(&pdev->dev, "failed to get vibrator base address.\n");
> -               return error;
> -       }
> +       if (error)
> +               return dev_err_probe(&pdev->dev, error,
> +                                    "failed to get vibrator base address.\n");

The device_property_read_u32() never returns an EPROBE_DEFER error, so
how can this function help? IMO, I did not see any benefits in this
case.

-- 
Baolin Wang