linux-kernel - Re: [PATCH 2/3] ACPICA: Fix access width for reset vector

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Message-Id: <201012092341.06913.rjw@sisk.pl>
Date:	Thu, 9 Dec 2010 23:41:06 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Matthew Garrett <mjg@...hat.com>
Cc:	x86@...nel.org, hpa@...or.com, linux-acpi@...r.kernel.org,
	lenb@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] ACPICA: Fix access width for reset vector

On Thursday, December 09, 2010, Matthew Garrett wrote:
> Section 4.7.3.6 of the ACPI specification requires that the register width
> of the reset vector be 8 bits. Windows simply hardcodes the access to be
> a byte and ignores the width provided in the FADT, so make sure that we
> do the same.
> 
> Signed-off-by: Matthew Garrett <mjg@...hat.com>

Acked-by: Rafael J. Wysocki <rjw@...k.pl>

> ---
>  drivers/acpi/acpica/hwxface.c |    5 ++---
>  1 files changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/acpi/acpica/hwxface.c b/drivers/acpi/acpica/hwxface.c
> index 50cc3be..c6a4e63 100644
> --- a/drivers/acpi/acpica/hwxface.c
> +++ b/drivers/acpi/acpica/hwxface.c
> @@ -82,12 +82,11 @@ acpi_status acpi_reset(void)
>  		/*
>  		 * For I/O space, write directly to the OSL. This bypasses the port
>  		 * validation mechanism, which may block a valid write to the reset
> -		 * register.
> +		 * register. Spec section 4.7.3.6 requires register width to be 8.
>  		 */
>  		status =
>  		    acpi_os_write_port((acpi_io_address) reset_reg->address,
> -				       acpi_gbl_FADT.reset_value,
> -				       reset_reg->bit_width);
> +				       acpi_gbl_FADT.reset_value, 8)
>  	} else {
>  		/* Write the reset value to the reset register */
>  
> 

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