linux-kernel - Re: [Resend Patch 3/9] ACPI: Add acpi_bus_attach_private_data() to facilitate to attach data to ACPI handle

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Date:	Tue, 22 Apr 2014 14:23:31 +0300
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Lan Tianyu <tianyu.lan@...el.com>
Cc:	wsa@...-dreams.de, rjw@...ysocki.net, awilliam@...hat.com,
	lenb@...nel.org, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: [Resend Patch 3/9] ACPI: Add acpi_bus_attach_private_data() to
 facilitate to attach data to ACPI handle

On Tue, Apr 22, 2014 at 02:24:09PM +0800, Lan Tianyu wrote:
> There is already acpi_bus_get_private_data() to get ACPI handle data
> which is associated with acpi_bus_private_data_handler(). This patch
> is to add acpi_bus_attach_private_data() to make a pair and facilitate
> to attach and get data to/from ACPI handle.
> 
> Signed-off-by: Lan Tianyu <tianyu.lan@...el.com>
> ---
>  drivers/acpi/bus.c      | 18 +++++++++++++++++-
>  include/acpi/acpi_bus.h |  1 +
>  2 files changed, 18 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
> index e7e5844..4ed8d48 100644
> --- a/drivers/acpi/bus.c
> +++ b/drivers/acpi/bus.c
> @@ -132,6 +132,22 @@ void acpi_bus_private_data_handler(acpi_handle handle,
>  }
>  EXPORT_SYMBOL(acpi_bus_private_data_handler);
>  
> +int acpi_bus_attach_private_data(acpi_handle handle, void *data)
> +{
> +	acpi_status status;
> +
> +	status = acpi_attach_data(handle,
> +			acpi_bus_private_data_handler, data);
> +	if (ACPI_FAILURE(status)) {
> +		ACPI_ERROR((AE_INFO, "Error attaching device[%p] data\n",
> +				handle));
> +		return -ENODEV;
> +	}
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(acpi_bus_attach_private_data);

When I added GPIO operation region support, Rafael mentioned that we might
want to add this private data to the struct acpi_device instead.

Either way, looks good to me,

Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
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