linux-kernel - Re: [PATCH v5 1/6] ACPI / util: Fix acpi_evaluate

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Date:	Fri, 08 Jan 2016 01:07:04 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Jerry Hoemann <jerry.hoemann@....com>
Cc:	ross.zwisler@...ux.intel.com, lenb@...nel.org,
	dan.j.williams@...el.com, elliott@....com, jmoyer@...hat.com,
	krivenok.dmitry@...il.com, linda.knippers@....com,
	robert.moore@...el.com, lv.zheng@...el.com,
	rafael.j.wysocki@...el.com, linux-nvdimm@...ts.01.org,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/6] ACPI / util: Fix acpi_evaluate_dsm() argument type

On Wednesday, January 06, 2016 04:03:38 PM Jerry Hoemann wrote:
> The ACPI spec speicifies that arguments "Revision ID" and
> "Function Index" to a _DSM are type "Integer."  Type Integers
> are 64 bit quantities.
> 
> The function evaluate_dsm specifies these types as simple "int"
> which are 32 bits.  Correct type passed to acpi_evaluate_dsm
> and its callers and derived callers to pass correct type.
> 
> acpi_check_dsm and acpi_evaluate_dsm_typed had similar issue
> and were corrected as well.
> 
> Signed-off-by: Jerry Hoemann <jerry.hoemann@....com>

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

> ---
>  drivers/acpi/utils.c    | 4 ++--
>  include/acpi/acpi_bus.h | 6 +++---
>  2 files changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
> index 475c907..049cba4 100644
> --- a/drivers/acpi/utils.c
> +++ b/drivers/acpi/utils.c
> @@ -628,7 +628,7 @@ acpi_status acpi_evaluate_lck(acpi_handle handle, int lock)
>   * some old BIOSes do expect a buffer or an integer etc.
>   */
>  union acpi_object *
> -acpi_evaluate_dsm(acpi_handle handle, const u8 *uuid, int rev, int func,
> +acpi_evaluate_dsm(acpi_handle handle, const u8 *uuid, u64 rev, u64 func,
>  		  union acpi_object *argv4)
>  {
>  	acpi_status ret;
> @@ -677,7 +677,7 @@ EXPORT_SYMBOL(acpi_evaluate_dsm);
>   * functions. Currently only support 64 functions at maximum, should be
>   * enough for now.
>   */
> -bool acpi_check_dsm(acpi_handle handle, const u8 *uuid, int rev, u64 funcs)
> +bool acpi_check_dsm(acpi_handle handle, const u8 *uuid, u64 rev, u64 funcs)
>  {
>  	int i;
>  	u64 mask = 0;
> diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
> index ad0a5ff..8e6abcf 100644
> --- a/include/acpi/acpi_bus.h
> +++ b/include/acpi/acpi_bus.h
> @@ -61,12 +61,12 @@ bool acpi_ata_match(acpi_handle handle);
>  bool acpi_bay_match(acpi_handle handle);
>  bool acpi_dock_match(acpi_handle handle);
>  
> -bool acpi_check_dsm(acpi_handle handle, const u8 *uuid, int rev, u64 funcs);
> +bool acpi_check_dsm(acpi_handle handle, const u8 *uuid, u64 rev, u64 funcs);
>  union acpi_object *acpi_evaluate_dsm(acpi_handle handle, const u8 *uuid,
> -			int rev, int func, union acpi_object *argv4);
> +			u64 rev, u64 func, union acpi_object *argv4);
>  
>  static inline union acpi_object *
> -acpi_evaluate_dsm_typed(acpi_handle handle, const u8 *uuid, int rev, int func,
> +acpi_evaluate_dsm_typed(acpi_handle handle, const u8 *uuid, u64 rev, u64 func,
>  			union acpi_object *argv4, acpi_object_type type)
>  {
>  	union acpi_object *obj;
> 

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.