linux-kernel - Re: [PATCH v4 2/4] iio: tsl2772: Use devm_add_action_or_reset for tsl2772_chip

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Date:   Thu, 1 Aug 2019 05:35:26 -0400
From:   Brian Masney <masneyb@...tation.org>
To:     Chuhong Yuan <hslester96@...il.com>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/4] iio: tsl2772: Use devm_add_action_or_reset for
 tsl2772_chip_off

On Thu, Aug 01, 2019 at 03:36:05PM +0800, Chuhong Yuan wrote:
> Use devm_add_action_or_reset to call tsl2772_chip_off
> when the device is removed.
> This also fixes the issue that the chip is turned off
> before the device is unregistered.
> 
> Fixes: 4e24c1719f34 ("staging: iio: tsl2x7x: rename driver to tsl2772")
> Signed-off-by: Chuhong Yuan <hslester96@...il.com>

Let's use this Fixes tag instead:

Fixes: c06c4d793584 ("staging: iio: tsl2x7x/tsl2772: move out of staging")

I'd wait and see if Jonathan wants you to resend out the series if he
has any changes.

Brian


> ---
> Changes in v4:
>   - Split v3 into three patches.
>   - Revise description to make it more precise.
> 
>  drivers/iio/light/tsl2772.c | 16 +++++++++++++---
>  1 file changed, 13 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/iio/light/tsl2772.c b/drivers/iio/light/tsl2772.c
> index 29cfd8ae2700..e866ae40f157 100644
> --- a/drivers/iio/light/tsl2772.c
> +++ b/drivers/iio/light/tsl2772.c
> @@ -860,6 +860,13 @@ static int tsl2772_chip_off(struct iio_dev *indio_dev)
>  	return tsl2772_write_control_reg(chip, 0x00);
>  }
>  
> +static void tsl2772_chip_off_action(void *data)
> +{
> +	struct iio_dev *indio_dev = data;
> +
> +	tsl2772_chip_off(indio_dev);
> +}
> +
>  /**
>   * tsl2772_invoke_change - power cycle the device to implement the user
>   *                         parameters
> @@ -1877,9 +1884,14 @@ static int tsl2772_probe(struct i2c_client *clientp,
>  	if (ret < 0)
>  		return ret;
>  
> +	ret = devm_add_action_or_reset(&clientp->dev,
> +					tsl2772_chip_off_action,
> +					indio_dev);
> +	if (ret < 0)
> +		return ret;
> +
>  	ret = iio_device_register(indio_dev);
>  	if (ret) {
> -		tsl2772_chip_off(indio_dev);
>  		dev_err(&clientp->dev,
>  			"%s: iio registration failed\n", __func__);
>  		return ret;
> @@ -1926,8 +1938,6 @@ static int tsl2772_remove(struct i2c_client *client)
>  {
>  	struct iio_dev *indio_dev = i2c_get_clientdata(client);
>  
> -	tsl2772_chip_off(indio_dev);
> -
>  	iio_device_unregister(indio_dev);
>  
>  	return 0;
> -- 
> 2.20.1