linux-kernel - Re: [RFC PATCH v2 19/35] ACPI: Move acpi_bus_trim_one() before acpi_scan_hot

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Message-ID: <20230914151025.00003cef@Huawei.com>
Date:   Thu, 14 Sep 2023 15:10:25 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     James Morse <james.morse@....com>
CC:     <linux-pm@...r.kernel.org>, <loongarch@...ts.linux.dev>,
        <linux-acpi@...r.kernel.org>, <linux-arch@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-riscv@...ts.infradead.org>, <kvmarm@...ts.linux.dev>,
        <x86@...nel.org>, Salil Mehta <salil.mehta@...wei.com>,
        Russell King <linux@...linux.org.uk>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        <jianyong.wu@....com>, <justin.he@....com>
Subject: Re: [RFC PATCH v2 19/35] ACPI: Move acpi_bus_trim_one() before
 acpi_scan_hot_remove()

On Wed, 13 Sep 2023 16:38:07 +0000
James Morse <james.morse@....com> wrote:

> A subsequent patch will change acpi_scan_hot_remove() to call
> acpi_bus_trim_one() instead of acpi_bus_trim(), meaning it can no longer
> rely on the prototype in the header file.
> 
> Move these functions further up the file.
> No change in behaviour.
> 
> Signed-off-by: James Morse <james.morse@....com>
FWIW
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

> ---
>  drivers/acpi/scan.c | 76 ++++++++++++++++++++++-----------------------
>  1 file changed, 38 insertions(+), 38 deletions(-)
> 
> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> index f898591ce05f..a675333618ae 100644
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -244,6 +244,44 @@ static int acpi_scan_try_to_offline(struct acpi_device *device)
>  	return 0;
>  }
>  
> +static int acpi_bus_trim_one(struct acpi_device *adev, void *not_used)
> +{
> +	struct acpi_scan_handler *handler = adev->handler;
> +
> +	acpi_dev_for_each_child_reverse(adev, acpi_bus_trim_one, NULL);
> +
> +	adev->flags.match_driver = false;
> +	if (handler) {
> +		if (handler->detach)
> +			handler->detach(adev);
> +
> +		adev->handler = NULL;
> +	} else {
> +		device_release_driver(&adev->dev);
> +	}
> +	/*
> +	 * Most likely, the device is going away, so put it into D3cold before
> +	 * that.
> +	 */
> +	acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
> +	adev->flags.initialized = false;
> +	acpi_device_clear_enumerated(adev);
> +
> +	return 0;
> +}
> +
> +/**
> + * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
> + * @adev: Root of the ACPI namespace scope to walk.
> + *
> + * Must be called under acpi_scan_lock.
> + */
> +void acpi_bus_trim(struct acpi_device *adev)
> +{
> +	acpi_bus_trim_one(adev, NULL);
> +}
> +EXPORT_SYMBOL_GPL(acpi_bus_trim);
> +
>  static int acpi_scan_hot_remove(struct acpi_device *device)
>  {
>  	acpi_handle handle = device->handle;
> @@ -2506,44 +2544,6 @@ int acpi_bus_scan(acpi_handle handle)
>  }
>  EXPORT_SYMBOL(acpi_bus_scan);
>  
> -static int acpi_bus_trim_one(struct acpi_device *adev, void *not_used)
> -{
> -	struct acpi_scan_handler *handler = adev->handler;
> -
> -	acpi_dev_for_each_child_reverse(adev, acpi_bus_trim_one, NULL);
> -
> -	adev->flags.match_driver = false;
> -	if (handler) {
> -		if (handler->detach)
> -			handler->detach(adev);
> -
> -		adev->handler = NULL;
> -	} else {
> -		device_release_driver(&adev->dev);
> -	}
> -	/*
> -	 * Most likely, the device is going away, so put it into D3cold before
> -	 * that.
> -	 */
> -	acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
> -	adev->flags.initialized = false;
> -	acpi_device_clear_enumerated(adev);
> -
> -	return 0;
> -}
> -
> -/**
> - * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
> - * @adev: Root of the ACPI namespace scope to walk.
> - *
> - * Must be called under acpi_scan_lock.
> - */
> -void acpi_bus_trim(struct acpi_device *adev)
> -{
> -	acpi_bus_trim_one(adev, NULL);
> -}
> -EXPORT_SYMBOL_GPL(acpi_bus_trim);
> -
>  int acpi_bus_register_early_device(int type)
>  {
>  	struct acpi_device *device = NULL;