linux-kernel - Re: [PATCH v3] iio: adc128s052: Simplify 'adc128

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Message-ID: <20211020174244.4b6a9206@jic23-huawei>
Date:   Wed, 20 Oct 2021 17:42:44 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     lars@...afoo.de, ardeleanalex@...il.com, andy.shevchenko@...il.com,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH v3] iio: adc128s052: Simplify 'adc128_probe()'

On Wed, 13 Oct 2021 22:07:25 +0200
Christophe JAILLET <christophe.jaillet@...adoo.fr> wrote:

> Le 29/08/2021 à 19:16, Jonathan Cameron a écrit :
> > On Thu, 26 Aug 2021 20:36:22 +0200
> > Christophe JAILLET <christophe.jaillet@...adoo.fr> wrote:
> >   
> >> Turn 'adc128_probe()' into a full resource managed function to simplify the
> >> code.
> >>
> >> This way, the .remove function can be removed.
> >> Doing so, the only 'spi_get_drvdata()' call is removed and the
> >> corresponding 'spi_set_drvdata()' can be removed as well.
> >>
> >> Suggested-by: Alexandru Ardelean <ardeleanalex@...il.com>
> >> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> >> Reviewed-by: Alexandru Ardelean <ardeleanalex@...il.com>  
> > Looks good to me, but as mentioned this will need to wait for the
> > fix to go upstream.
> > 
> > Give me a poke if I seem to have lost it once that's true.  
> 
> Hi,
> 
> looks like it's fine now. So this is a gentle reminder :)
> The fix is in -next (see [1])
> 
> CJ
> 
> [1]: 
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/log/drivers/iio/adc/ti-adc128s052.c

Applied to the togreg branch of iio.git and pushed out as testing for
0-day to see if we missed anything.

Thanks,

Jonathan

> 
> > 
> > Thanks,
> > 
> > Jonathan
> >   
> >> ---
> >> Compile tested only.
> >>
> >> When reviewing, pay special attention to the 'spi_set_drvdata()' call
> >> removal. I recently introduced a regression with a too aggressive cleanup
> >> like that.
> >>
> >> This patch should be applied after
> >> https://lore.kernel.org/linux-iio/f33069f0-601b-4bbb-3766-026f7a161912-39ZsbGIQGT5GWvitb5QawA@public.gmane.org/T/#meb792dcd6540f87d9ae041660ca4738a776e924a
> >>
> >> v1 --> v2: just garbage --> ignore
> >> v1 --> v3: Simplify 'adc128_disable_regulator()'
> >> ---
> >>   drivers/iio/adc/ti-adc128s052.c | 26 +++++++++-----------------
> >>   1 file changed, 9 insertions(+), 17 deletions(-)
> >>
> >> diff --git a/drivers/iio/adc/ti-adc128s052.c b/drivers/iio/adc/ti-adc128s052.c
> >> index 3143f35a6509..ce0cfe40b219 100644
> >> --- a/drivers/iio/adc/ti-adc128s052.c
> >> +++ b/drivers/iio/adc/ti-adc128s052.c
> >> @@ -132,6 +132,11 @@ static const struct iio_info adc128_info = {
> >>   	.read_raw = adc128_read_raw,
> >>   };
> >>   
> >> +static void adc128_disable_regulator(void *reg)
> >> +{
> >> +	regulator_disable(reg);
> >> +}
> >> +
> >>   static int adc128_probe(struct spi_device *spi)
> >>   {
> >>   	struct iio_dev *indio_dev;
> >> @@ -151,8 +156,6 @@ static int adc128_probe(struct spi_device *spi)
> >>   	adc = iio_priv(indio_dev);
> >>   	adc->spi = spi;
> >>   
> >> -	spi_set_drvdata(spi, indio_dev);
> >> -
> >>   	indio_dev->name = spi_get_device_id(spi)->name;
> >>   	indio_dev->modes = INDIO_DIRECT_MODE;
> >>   	indio_dev->info = &adc128_info;
> >> @@ -167,23 +170,13 @@ static int adc128_probe(struct spi_device *spi)
> >>   	ret = regulator_enable(adc->reg);
> >>   	if (ret < 0)
> >>   		return ret;
> >> +	ret = devm_add_action_or_reset(&spi->dev, adc128_disable_regulator, adc->reg);
> >> +	if (ret)
> >> +		return ret;
> >>   
> >>   	mutex_init(&adc->lock);
> >>   
> >> -	ret = iio_device_register(indio_dev);
> >> -
> >> -	return ret;
> >> -}
> >> -
> >> -static int adc128_remove(struct spi_device *spi)
> >> -{
> >> -	struct iio_dev *indio_dev = spi_get_drvdata(spi);
> >> -	struct adc128 *adc = iio_priv(indio_dev);
> >> -
> >> -	iio_device_unregister(indio_dev);
> >> -	regulator_disable(adc->reg);
> >> -
> >> -	return 0;
> >> +	return devm_iio_device_register(&spi->dev, indio_dev);
> >>   }
> >>   
> >>   static const struct of_device_id adc128_of_match[] = {
> >> @@ -225,7 +218,6 @@ static struct spi_driver adc128_driver = {
> >>   		.acpi_match_table = ACPI_PTR(adc128_acpi_match),
> >>   	},
> >>   	.probe = adc128_probe,
> >> -	.remove = adc128_remove,
> >>   	.id_table = adc128_id,
> >>   };
> >>   module_spi_driver(adc128_driver);  
> > 
> >   
>