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SubjectRe: [PATCH 08/10] platform/x86: toshiba_acpi: use device-managed for wwan_rfkill management
On Wed, 24 Mar 2021 14:55:46 +0200
Alexandru Ardelean <aardelean@deviqon.com> wrote:

> This change converts the wwan_rfkill object to be free'd automatically when
> the parent refcount goes to zero.
> There are 2 cleanup operations required: rfkill_unregister() and
> rfkill_destroy(). Since they don't have any devm_ variants, they are hooked
> via devm_add_action_or_reset().
>
> The main reason to do this is to enforce ordering on cleanup, when the
> Toshiba ACPI device is cleaned up.
>
> Signed-off-by: Alexandru Ardelean <aardelean@deviqon.com>
Superficially looks fine to me though I don't know much about rfkill.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

> ---
> drivers/platform/x86/toshiba_acpi.c | 40 ++++++++++++++++++++++-------
> 1 file changed, 31 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
> index 12860ef60e4d..a1249f6dde9a 100644
> --- a/drivers/platform/x86/toshiba_acpi.c
> +++ b/drivers/platform/x86/toshiba_acpi.c
> @@ -2591,7 +2591,22 @@ static const struct rfkill_ops wwan_rfk_ops = {
> .poll = toshiba_acpi_wwan_poll,
> };
>
> -static int toshiba_acpi_setup_wwan_rfkill(struct toshiba_acpi_dev *dev)
> +static void toshiba_acpi_rfkill_destroy(void *data)
> +{
> + struct rfkill *wwan_rfk = data;
> +
> + rfkill_destroy(wwan_rfk);
> +}
> +
> +static void toshiba_acpi_rfkill_unreg(void *data)
> +{
> + struct rfkill *wwan_rfk = data;
> +
> + rfkill_unregister(wwan_rfk);
> +}
> +
> +static int toshiba_acpi_setup_wwan_rfkill(struct device *parent,
> + struct toshiba_acpi_dev *dev)
> {
> int ret = toshiba_wireless_status(dev);
>
> @@ -2608,15 +2623,27 @@ static int toshiba_acpi_setup_wwan_rfkill(struct toshiba_acpi_dev *dev)
> return -ENOMEM;
> }
>
> + ret = devm_add_action_or_reset(parent, toshiba_acpi_rfkill_destroy,
> + dev->wwan_rfk);
> + if (ret)
> + return ret;
> +
> rfkill_set_hw_state(dev->wwan_rfk, !dev->killswitch);
>
> ret = rfkill_register(dev->wwan_rfk);
> if (ret) {
> pr_err("Unable to register WWAN rfkill device\n");
> - rfkill_destroy(dev->wwan_rfk);
> + return ret;
> }
>
> - return ret;
> + ret = devm_add_action_or_reset(parent, toshiba_acpi_rfkill_unreg,
> + dev->wwan_rfk);
> + if (ret) {
> + dev->wwan_rfk = NULL;
> + return ret;
> + }
> +
> + return 0;
> }
>
> /*
> @@ -2996,11 +3023,6 @@ static int toshiba_acpi_remove(struct acpi_device *acpi_dev)
> sysfs_remove_group(&dev->acpi_dev->dev.kobj,
> &toshiba_attr_group);
>
> - if (dev->wwan_rfk) {
> - rfkill_unregister(dev->wwan_rfk);
> - rfkill_destroy(dev->wwan_rfk);
> - }
> -
> return 0;
> }
>
> @@ -3189,7 +3211,7 @@ static int toshiba_acpi_add(struct acpi_device *acpi_dev)
>
> toshiba_wwan_available(dev);
> if (dev->wwan_supported)
> - toshiba_acpi_setup_wwan_rfkill(dev);
> + toshiba_acpi_setup_wwan_rfkill(parent, dev);
>
> toshiba_cooling_method_available(dev);
>

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