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Date: Sun, 16 Dec 2018 13:43:11 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Stefan Popa <stefan.popa@...log.com>
Cc: <robh+dt@...nel.org>, <mark.rutland@....com>,
<Michael.Hennerich@...log.com>, <knaack.h@....de>,
<lars@...afoo.de>, <pmeerw@...erw.net>,
<gregkh@...uxfoundation.org>, <linux-kernel@...r.kernel.org>,
<linux-iio@...r.kernel.org>, <devel@...verdev.osuosl.org>,
<stefan.popa@...log.co>
Subject: Re: [PATCH 04/11] staging: iio: adc: ad7606: Use devm functions in
probe
On Thu, 13 Dec 2018 14:46:16 +0200
Stefan Popa <stefan.popa@...log.com> wrote:
> Switch to devm version of request_irq, iio_triggered_buffer_setup,
> iio_device_register. To avoid potential ordering issues in probe,
> devm_add_action_or_reset() is used for the regulator_disable(). This
> simplifies the code and decreases the chance of bugs.
>
> Signed-off-by: Stefan Popa <stefan.popa@...log.com>
Very nice.
Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to play with it.
Thanks,
Jonathan
> ---
> drivers/staging/iio/adc/ad7606.c | 59 +++++++++++++-----------------------
> drivers/staging/iio/adc/ad7606.h | 1 -
> drivers/staging/iio/adc/ad7606_par.c | 6 ----
> drivers/staging/iio/adc/ad7606_spi.c | 6 ----
> 4 files changed, 21 insertions(+), 51 deletions(-)
>
> diff --git a/drivers/staging/iio/adc/ad7606.c b/drivers/staging/iio/adc/ad7606.c
> index 4b1bc20..7191d51 100644
> --- a/drivers/staging/iio/adc/ad7606.c
> +++ b/drivers/staging/iio/adc/ad7606.c
> @@ -417,6 +417,13 @@ static const struct iio_info ad7606_info_range = {
> .attrs = &ad7606_attribute_group_range,
> };
>
> +static void ad7606_regulator_disable(void *data)
> +{
> + struct ad7606_state *st = data;
> +
> + regulator_disable(st->reg);
> +}
> +
> int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
> const char *name, unsigned int id,
> const struct ad7606_bus_ops *bops)
> @@ -430,6 +437,7 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
> return -ENOMEM;
>
> st = iio_priv(indio_dev);
> + dev_set_drvdata(dev, indio_dev);
>
> st->dev = dev;
> mutex_init(&st->lock);
> @@ -450,11 +458,15 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
> return ret;
> }
>
> + ret = devm_add_action_or_reset(dev, ad7606_regulator_disable, st);
> + if (ret)
> + return ret;
> +
> st->chip_info = &ad7606_chip_info_tbl[id];
>
> ret = ad7606_request_gpios(st);
> if (ret)
> - goto error_disable_reg;
> + return ret;
>
> indio_dev->dev.parent = dev;
> if (st->gpio_os) {
> @@ -479,50 +491,21 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
> if (ret)
> dev_warn(st->dev, "failed to RESET: no RESET GPIO specified\n");
>
> - ret = request_irq(irq, ad7606_interrupt, IRQF_TRIGGER_FALLING, name,
> - indio_dev);
> - if (ret)
> - goto error_disable_reg;
> -
> - ret = iio_triggered_buffer_setup(indio_dev, &ad7606_trigger_handler,
> - NULL, NULL);
> + ret = devm_request_irq(dev, irq, ad7606_interrupt, IRQF_TRIGGER_FALLING,
> + name, indio_dev);
> if (ret)
> - goto error_free_irq;
> + return ret;
>
> - ret = iio_device_register(indio_dev);
> + ret = devm_iio_triggered_buffer_setup(dev, indio_dev,
> + &ad7606_trigger_handler,
> + NULL, NULL);
> if (ret)
> - goto error_unregister_ring;
> -
> - dev_set_drvdata(dev, indio_dev);
> -
> - return 0;
> -error_unregister_ring:
> - iio_triggered_buffer_cleanup(indio_dev);
> -
> -error_free_irq:
> - free_irq(irq, indio_dev);
> + return ret;
>
> -error_disable_reg:
> - regulator_disable(st->reg);
> - return ret;
> + return devm_iio_device_register(dev, indio_dev);
> }
> EXPORT_SYMBOL_GPL(ad7606_probe);
>
> -int ad7606_remove(struct device *dev, int irq)
> -{
> - struct iio_dev *indio_dev = dev_get_drvdata(dev);
> - struct ad7606_state *st = iio_priv(indio_dev);
> -
> - iio_device_unregister(indio_dev);
> - iio_triggered_buffer_cleanup(indio_dev);
> -
> - free_irq(irq, indio_dev);
> - regulator_disable(st->reg);
> -
> - return 0;
> -}
> -EXPORT_SYMBOL_GPL(ad7606_remove);
> -
> #ifdef CONFIG_PM_SLEEP
>
> static int ad7606_suspend(struct device *dev)
> diff --git a/drivers/staging/iio/adc/ad7606.h b/drivers/staging/iio/adc/ad7606.h
> index cf20ca2..70486ef 100644
> --- a/drivers/staging/iio/adc/ad7606.h
> +++ b/drivers/staging/iio/adc/ad7606.h
> @@ -84,7 +84,6 @@ struct ad7606_bus_ops {
> int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
> const char *name, unsigned int id,
> const struct ad7606_bus_ops *bops);
> -int ad7606_remove(struct device *dev, int irq);
>
> enum ad7606_supported_device_ids {
> ID_AD7605_4,
> diff --git a/drivers/staging/iio/adc/ad7606_par.c b/drivers/staging/iio/adc/ad7606_par.c
> index db2fede46..6269ee7 100644
> --- a/drivers/staging/iio/adc/ad7606_par.c
> +++ b/drivers/staging/iio/adc/ad7606_par.c
> @@ -71,11 +71,6 @@ static int ad7606_par_probe(struct platform_device *pdev)
> &ad7606_par8_bops);
> }
>
> -static int ad7606_par_remove(struct platform_device *pdev)
> -{
> - return ad7606_remove(&pdev->dev, platform_get_irq(pdev, 0));
> -}
> -
> static const struct platform_device_id ad7606_driver_ids[] = {
> {
> .name = "ad7605-4",
> @@ -97,7 +92,6 @@ MODULE_DEVICE_TABLE(platform, ad7606_driver_ids);
>
> static struct platform_driver ad7606_driver = {
> .probe = ad7606_par_probe,
> - .remove = ad7606_par_remove,
> .id_table = ad7606_driver_ids,
> .driver = {
> .name = "ad7606",
> diff --git a/drivers/staging/iio/adc/ad7606_spi.c b/drivers/staging/iio/adc/ad7606_spi.c
> index b6553ce..9291598 100644
> --- a/drivers/staging/iio/adc/ad7606_spi.c
> +++ b/drivers/staging/iio/adc/ad7606_spi.c
> @@ -48,11 +48,6 @@ static int ad7606_spi_probe(struct spi_device *spi)
> &ad7606_spi_bops);
> }
>
> -static int ad7606_spi_remove(struct spi_device *spi)
> -{
> - return ad7606_remove(&spi->dev, spi->irq);
> -}
> -
> static const struct spi_device_id ad7606_id[] = {
> {"ad7605-4", ID_AD7605_4},
> {"ad7606-8", ID_AD7606_8},
> @@ -68,7 +63,6 @@ static struct spi_driver ad7606_driver = {
> .pm = AD7606_PM_OPS,
> },
> .probe = ad7606_spi_probe,
> - .remove = ad7606_spi_remove,
> .id_table = ad7606_id,
> };
> module_spi_driver(ad7606_driver);
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