linux-kernel - Re: [PATCH -next] iio: frequency: adf4350: disable reg and clk on error in adf4350

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Date:   Thu, 3 Jun 2021 17:18:22 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Yang Yingliang <yangyingliang@...wei.com>
Cc:     <linux-kernel@...r.kernel.org>, <linux-iio@...r.kernel.org>,
        <lars@...afoo.de>, <Michael.Hennerich@...log.com>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH -next] iio: frequency: adf4350: disable reg and clk on
 error in adf4350_probe()

On Tue, 1 Jun 2021 22:26:05 +0800
Yang Yingliang <yangyingliang@...wei.com> wrote:

> Disable reg and clk when devm_gpiod_get_optional() fails in adf4350_probe().

Hi.

One small thing. It would be useful if you could check if the bug exists other
than in next (this one has been their for some time!)  If it does, please
don't add the -next in the patch title (as basically it makes me not worry
about reading it for a few days :)

Also, make sure to cc the author of the patch in the fixes tag
+CC Linus

Obvious enough fix (I hope) that I've applied it to the fixes-togreg branch of
iio.git and marked for stable.

Thanks,

Jonathan

> 
> Fixes:4a89d2f47ccd ("iio: adf4350: Convert to use GPIO descriptor")
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> ---
>  drivers/iio/frequency/adf4350.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/frequency/adf4350.c b/drivers/iio/frequency/adf4350.c
> index 1462a6a5bc6d..3d9eba716b69 100644
> --- a/drivers/iio/frequency/adf4350.c
> +++ b/drivers/iio/frequency/adf4350.c
> @@ -563,8 +563,10 @@ static int adf4350_probe(struct spi_device *spi)
>  
>  	st->lock_detect_gpiod = devm_gpiod_get_optional(&spi->dev, NULL,
>  							GPIOD_IN);
> -	if (IS_ERR(st->lock_detect_gpiod))
> -		return PTR_ERR(st->lock_detect_gpiod);
> +	if (IS_ERR(st->lock_detect_gpiod)) {
> +		ret = PTR_ERR(st->lock_detect_gpiod);
> +		goto error_disable_reg;
> +	}
>  
>  	if (pdata->power_up_frequency) {
>  		ret = adf4350_set_freq(st, pdata->power_up_frequency);