linux-kernel - Re: [PATCH] ACPI / I2C: Use parent's ACPI_HANDLE() in acpi_i2c_register

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Date:	Mon, 01 Apr 2013 09:27:41 +0800
From:	Aaron Lu <aaron.lu@...el.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
	Ben Dooks <ben-linux@...ff.org>,
	Jean Delvare <khali@...ux-fr.org>
Subject: Re: [PATCH] ACPI / I2C: Use parent's ACPI_HANDLE() in acpi_i2c_register_devices()

On 04/01/2013 08:25 AM, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> The ACPI handle of struct i2c_adapter's dev member should not be
> set, because this causes that struct i2c_adapter to be associated
> with the ACPI device node corresponding to its parent as the
> second "physical_device", which is incorrect (this happens during
> the registration of struct i2c_adapter).  Consequently,
> acpi_i2c_register_devices() should use the ACPI handle of the
> parent of the struct i2c_adapter it is called for rather than the
> struct i2c_adapter's ACPI handle (which should be NULL).
> 
> Make that happen and modify the i2c-designware-platdrv driver,
> which currently is the only driver for ACPI-enumerated I2C
> controller chips, not to set the ACPI handle for the
> struct i2c_adapter it creates.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Reviewed-by: Aaron Lu <aaron.lu@...el.com>

Thanks,
Aaron

> ---
>  drivers/acpi/acpi_i2c.c                     |    2 +-
>  drivers/i2c/busses/i2c-designware-platdrv.c |    1 -
>  2 files changed, 1 insertion(+), 2 deletions(-)
> 
> Index: linux-pm/drivers/acpi/acpi_i2c.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/acpi_i2c.c
> +++ linux-pm/drivers/acpi/acpi_i2c.c
> @@ -90,7 +90,7 @@ void acpi_i2c_register_devices(struct i2
>  	acpi_handle handle;
>  	acpi_status status;
>  
> -	handle = ACPI_HANDLE(&adapter->dev);
> +	handle = ACPI_HANDLE(adapter->dev.parent);
>  	if (!handle)
>  		return;
>  
> Index: linux-pm/drivers/i2c/busses/i2c-designware-platdrv.c
> ===================================================================
> --- linux-pm.orig/drivers/i2c/busses/i2c-designware-platdrv.c
> +++ linux-pm/drivers/i2c/busses/i2c-designware-platdrv.c
> @@ -182,7 +182,6 @@ static int dw_i2c_probe(struct platform_
>  	adap->algo = &i2c_dw_algo;
>  	adap->dev.parent = &pdev->dev;
>  	adap->dev.of_node = pdev->dev.of_node;
> -	ACPI_HANDLE_SET(&adap->dev, ACPI_HANDLE(&pdev->dev));
>  
>  	r = i2c_add_numbered_adapter(adap);
>  	if (r) {
> 
> --
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