linux-kernel - Re: [PATCH] iio: adc: nau7802: convert probe to full device-managed

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Message-ID: <20211002170601.2a37a8a0@jic23-huawei>
Date:   Sat, 2 Oct 2021 17:06:01 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     Alexandru Ardelean <aardelean@...iqon.com>,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        Maxime Ripard <maxime@...no.tech>
Subject: Re: [PATCH] iio: adc: nau7802: convert probe to full device-managed

On Fri, 1 Oct 2021 00:02:34 +0200
Alexandre Belloni <alexandre.belloni@...tlin.com> wrote:

> On 30/09/2021 17:10:23+0100, Jonathan Cameron wrote:
> > On Sun, 26 Sep 2021 18:49:32 +0300
> > Alexandru Ardelean <aardelean@...iqon.com> wrote:
> >   
> > > This is a trivial conversion to device-managed functions.
> > > The mutex_destroy() calls are redundant, as the data will be free'd anyway.
> > > 
> > > And the IRQ and IIO register functions both have device-managed
> > > equivalents.
> > > 
> > > Signed-off-by: Alexandru Ardelean <aardelean@...iqon.com>  
> > 
> > +CC Maxime and Alexandre.
> > 
> > Looks simple enough to me that I won't wait on their replies to queue it up.
> > Obviously feedback welcome though!
> > 
> > Applied to the togreg branch of iio.git and pushed out as testing for 0-day
> > to see if it can find stuff we missed.
> >   
> 
> This seems good to me too
> Reviewed-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
Great. Added tag.

Thanks,

Jonathan
> 
> > Thanks,
> > 
> > Jonathan
> > 
> >   
> > > ---
> > >  drivers/iio/adc/nau7802.c | 50 +++++++--------------------------------
> > >  1 file changed, 9 insertions(+), 41 deletions(-)
> > > 
> > > diff --git a/drivers/iio/adc/nau7802.c b/drivers/iio/adc/nau7802.c
> > > index bb70b51d25b1..976c235f3079 100644
> > > --- a/drivers/iio/adc/nau7802.c
> > > +++ b/drivers/iio/adc/nau7802.c
> > > @@ -428,8 +428,6 @@ static int nau7802_probe(struct i2c_client *client,
> > >  
> > >  	st = iio_priv(indio_dev);
> > >  
> > > -	i2c_set_clientdata(client, indio_dev);
> > > -
> > >  	indio_dev->name = dev_name(&client->dev);
> > >  	indio_dev->modes = INDIO_DIRECT_MODE;
> > >  	indio_dev->info = &nau7802_info;
> > > @@ -495,13 +493,13 @@ static int nau7802_probe(struct i2c_client *client,
> > >  	 * will enable them back when we will need them..
> > >  	 */
> > >  	if (client->irq) {
> > > -		ret = request_threaded_irq(client->irq,
> > > -				NULL,
> > > -				nau7802_eoc_trigger,
> > > -				IRQF_TRIGGER_HIGH | IRQF_ONESHOT |
> > > -				IRQF_NO_AUTOEN,
> > > -				client->dev.driver->name,
> > > -				indio_dev);
> > > +		ret = devm_request_threaded_irq(&client->dev, client->irq,
> > > +						NULL,
> > > +						nau7802_eoc_trigger,
> > > +						IRQF_TRIGGER_HIGH | IRQF_ONESHOT |
> > > +						IRQF_NO_AUTOEN,
> > > +						client->dev.driver->name,
> > > +						indio_dev);
> > >  		if (ret) {
> > >  			/*
> > >  			 * What may happen here is that our IRQ controller is
> > > @@ -526,7 +524,7 @@ static int nau7802_probe(struct i2c_client *client,
> > >  		ret = i2c_smbus_write_byte_data(st->client, NAU7802_REG_CTRL2,
> > >  					  NAU7802_CTRL2_CRS(st->sample_rate));
> > >  		if (ret)
> > > -			goto error_free_irq;
> > > +			return ret;
> > >  	}
> > >  
> > >  	/* Setup the ADC channels available on the board */
> > > @@ -536,36 +534,7 @@ static int nau7802_probe(struct i2c_client *client,
> > >  	mutex_init(&st->lock);
> > >  	mutex_init(&st->data_lock);
> > >  
> > > -	ret = iio_device_register(indio_dev);
> > > -	if (ret < 0) {
> > > -		dev_err(&client->dev, "Couldn't register the device.\n");
> > > -		goto error_device_register;
> > > -	}
> > > -
> > > -	return 0;
> > > -
> > > -error_device_register:
> > > -	mutex_destroy(&st->lock);
> > > -	mutex_destroy(&st->data_lock);
> > > -error_free_irq:
> > > -	if (client->irq)
> > > -		free_irq(client->irq, indio_dev);
> > > -
> > > -	return ret;
> > > -}
> > > -
> > > -static int nau7802_remove(struct i2c_client *client)
> > > -{
> > > -	struct iio_dev *indio_dev = i2c_get_clientdata(client);
> > > -	struct nau7802_state *st = iio_priv(indio_dev);
> > > -
> > > -	iio_device_unregister(indio_dev);
> > > -	mutex_destroy(&st->lock);
> > > -	mutex_destroy(&st->data_lock);
> > > -	if (client->irq)
> > > -		free_irq(client->irq, indio_dev);
> > > -
> > > -	return 0;
> > > +	return devm_iio_device_register(&client->dev, indio_dev);
> > >  }
> > >  
> > >  static const struct i2c_device_id nau7802_i2c_id[] = {
> > > @@ -582,7 +551,6 @@ MODULE_DEVICE_TABLE(of, nau7802_dt_ids);
> > >  
> > >  static struct i2c_driver nau7802_driver = {
> > >  	.probe = nau7802_probe,
> > > -	.remove = nau7802_remove,
> > >  	.id_table = nau7802_i2c_id,
> > >  	.driver = {
> > >  		   .name = "nau7802",  
> >   
>