On Sun, Jul 22, 2018 at 11:33:29PM -0400, Maxime Roussin-Bélanger wrote:
> Use devm_iio_channel_get_all() to automatically release
> channels.
>
> Use devm_hwmon_device_register_with_groups() to
> automatically unregister the device.
>
> Signed-off-by: Maxime Roussin-Bélanger <maxime.roussinbelanger@xxxxxxxxx>
Applied, with a couple of additional changes (see below).
Thanks,
Guenter
> ---
> Changes in v2:
> - Remove unnecessary {}
>
> drivers/hwmon/iio_hwmon.c | 63 ++++++++++++---------------------------
> 1 file changed, 19 insertions(+), 44 deletions(-)
>
> diff --git a/drivers/hwmon/iio_hwmon.c b/drivers/hwmon/iio_hwmon.c
> index a3a1d1cb2f27..44d7dfe9cb46 100644
> --- a/drivers/hwmon/iio_hwmon.c
> +++ b/drivers/hwmon/iio_hwmon.c
> @@ -73,44 +73,38 @@ static int iio_hwmon_probe(struct platform_device *pdev)
> if (dev->of_node && dev->of_node->name)
> name = dev->of_node->name;
>
> - channels = iio_channel_get_all(dev);
> + channels = devm_iio_channel_get_all(dev);
> if (IS_ERR(channels)) {
> if (PTR_ERR(channels) == -ENODEV)
> return -EPROBE_DEFER;
> return PTR_ERR(channels);
> }
>
> st = devm_kzalloc(dev, sizeof(*st), GFP_KERNEL);
> - if (st == NULL) {
> - ret = -ENOMEM;
> - goto error_release_channels;
> - }
> + if (st == NULL)
> + return -ENOMEM;
>
> st->channels = channels;
>
> /* count how many attributes we have */
> while (st->channels[st->num_channels].indio_dev)
> st->num_channels++;
>
> st->attrs = devm_kzalloc(dev,
> sizeof(*st->attrs) * (st->num_channels + 1),
> GFP_KERNEL);
> - if (st->attrs == NULL) {
> - ret = -ENOMEM;
> - goto error_release_channels;
> - }
> + if (st->attrs == NULL)
> + return -ENOMEM;
>
> for (i = 0; i < st->num_channels; i++) {
> a = devm_kzalloc(dev, sizeof(*a), GFP_KERNEL);
> - if (a == NULL) {
> - ret = -ENOMEM;
> - goto error_release_channels;
> - }
> + if (a == NULL)
> + return -ENOMEM;
>
> sysfs_attr_init(&a->dev_attr.attr);
> ret = iio_get_channel_type(&st->channels[i], &type);
> if (ret < 0)
> - goto error_release_channels;
> + return ret;
>
> switch (type) {
> case IIO_VOLTAGE:
> @@ -138,49 +132,31 @@ static int iio_hwmon_probe(struct platform_device *pdev)
> humidity_i++);
> break;
> default:
> - ret = -EINVAL;
> - goto error_release_channels;
> - }
> - if (a->dev_attr.attr.name == NULL) {
> - ret = -ENOMEM;
> - goto error_release_channels;
> + return -EINVAL;
> }
> + if (a->dev_attr.attr.name == NULL)
> + return -ENOMEM;
> +
> a->dev_attr.show = iio_hwmon_read_val;
> a->dev_attr.attr.mode = S_IRUGO;
> a->index = i;
> st->attrs[i] = &a->dev_attr.attr;
> }
>
> st->attr_group.attrs = st->attrs;
> st->groups[0] = &st->attr_group;
>
> sname = devm_kstrdup(dev, name, GFP_KERNEL);
> - if (!sname) {
> - ret = -ENOMEM;
> - goto error_release_channels;
> - }
> + if (!sname)
> + return -ENOMEM;
>
> strreplace(sname, '-', '_');
> - st->hwmon_dev = hwmon_device_register_with_groups(dev, sname, st,
> - st->groups);
> - if (IS_ERR(st->hwmon_dev)) {
> - ret = PTR_ERR(st->hwmon_dev);
> - goto error_release_channels;
> - }
> - platform_set_drvdata(pdev, st);
> - return 0;
> -
> -error_release_channels:
> - iio_channel_release_all(channels);
> - return ret;
> -}
> + st->hwmon_dev = devm_hwmon_device_register_with_groups(dev, sname, st,
> + st->groups);
st->hwmon_dev is now unnecessary. Changed to local variable.
> + if (IS_ERR(st->hwmon_dev))
> + return PTR_ERR(st->hwmon_dev);
>
> -static int iio_hwmon_remove(struct platform_device *pdev)
> -{
> - struct iio_hwmon_state *st = platform_get_drvdata(pdev);
> -
> - hwmon_device_unregister(st->hwmon_dev);
> - iio_channel_release_all(st->channels);
> + platform_set_drvdata(pdev, st);
This is now unnecessary. Dropped. With this, the simplified the code to
hwmon_dev = devm_hwmon_device_register_with_groups(dev, sname, st,
st->groups);
return PTR_ERR_OR_ZERO(hwmon_dev);
>
> return 0;
> }
> @@ -197,7 +173,6 @@ static struct platform_driver __refdata iio_hwmon_driver = {
> .of_match_table = iio_hwmon_of_match,
> },
> .probe = iio_hwmon_probe,
> - .remove = iio_hwmon_remove,
> };
>
> module_platform_driver(iio_hwmon_driver);
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