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

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Date:   Mon, 5 Aug 2019 16:29:20 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Brian Masney <masneyb@...tation.org>
Cc:     Chuhong Yuan <hslester96@...il.com>,
        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, 1 Aug 2019 05:35:26 -0400
Brian Masney <masneyb@...tation.org> wrote:

> 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.

I've added a note to say this will probably need a backport for stable.
Actually in that case we should be looking for a more minimal solution than
this anyway.

Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to play with it.

Thanks,

Jonathan

> 
> 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