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Subject: Re: [PATCH v2] io: accel: kxcjk1013: restore the range after resume.
To:     "Chen, Hu" <hu1.chen@intel.com>
Cc:     bo.he@intel.com, Jonathan Cameron <jic23@kernel.org>,
        Hartmut Knaack <knaack.h@gmx.de>,
        Lars-Peter Clausen <lars@metafoo.de>,
        Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
        Stephan Gerhold <stephan@gerhold.net>,
        linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20190303161728.3571869e@archlinux>
 <20190304070556.24681-1-hu1.chen@intel.com>
From:   Hans de Goede <hdegoede@redhat.com>
Message-ID: <23ced5ac-b0a0-7d87-76d7-bdec0c3e0e15@redhat.com>
Date:   Mon, 4 Mar 2019 10:16:56 +0100
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Hi,

On 04-03-19 08:05, Chen, Hu wrote:
> From: "he, bo" <bo.he@intel.com>
> 
> On some laptops, kxcjk1013 is powered off when system enters S3. We need
> restore the range regiter during resume. Otherwise, the sensor doesn't
> work properly after S3.
> 
> Signed-off-by: he, bo <bo.he@intel.com>
> Signed-off-by: Chen, Hu <hu1.chen@intel.com>

Thank you for the patch.

> ---
> Changes in v2:
> - Handle return value independently in resume callback.
> 
>   drivers/iio/accel/kxcjk-1013.c | 5 +++++
>   1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/iio/accel/kxcjk-1013.c b/drivers/iio/accel/kxcjk-1013.c
> index 7096e577b23f..17837e26bcf2 100644
> --- a/drivers/iio/accel/kxcjk-1013.c
> +++ b/drivers/iio/accel/kxcjk-1013.c
> @@ -1437,6 +1437,11 @@ static int kxcjk1013_resume(struct device *dev)
>   
>   	mutex_lock(&data->mutex);
>   	ret = kxcjk1013_set_mode(data, OPERATION);
> +	if (ret < 0) {
> +		mutex_unlock(&data->mutex);
> +		return ret;
> +	}
> +	ret = kxcjk1013_set_range(data, data->range);
>   	mutex_unlock(&data->mutex);
>   
>   	return ret;


I'm not a fan of the extra unlock, IMHO it would be better to instead do:

  	mutex_lock(&data->mutex);
  	ret = kxcjk1013_set_mode(data, OPERATION);
	if (ret == 0)
		ret = kxcjk1013_set_range(data, data->range);
  	mutex_unlock(&data->mutex);

Regards,

Hans