linux-kernel - Re: [PATCH v4] ACPI: Fix acpi_evaluate

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Date:	Thu, 23 Jan 2014 10:19:53 +0800
From:	Yijing Wang <wangyijing@...wei.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	"David Airlie" <airlied@...ux.ie>,
	<intel-gfx@...ts.freedesktop.org>,
	"DRI mailing list" <dri-devel@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Dave Airlie <airlied@...hat.com>,
	Hanjun Guo <guohanjun@...wei.com>
Subject: Re: [PATCH v4] ACPI: Fix acpi_evaluate_object() return value check

On 2014/1/23 5:37, Bjorn Helgaas wrote:
> On Mon, Jan 20, 2014 at 7:46 PM, Yijing Wang <wangyijing@...wei.com> wrote:
>> Since acpi_evaluate_object() returns acpi_status and not plain int,
>> ACPI_FAILURE() should be used for checking its return value.
>>
>> Reviewed-by: Jani Nikula <jani.nikula@...el.com>
>> Signed-off-by: Yijing Wang <wangyijing@...wei.com>
>> ---
>> v3->v4: Fix spell error, add Jani Nikula reviewed-by.
>> v2->v3: Fix compile error pointed out by Hanjun.
>> v1->v2: Add CC to related subsystem MAINTAINERS
>> ---
>>  drivers/gpu/drm/i915/intel_acpi.c              |   24 ++++++++++++++----------
>>  drivers/gpu/drm/nouveau/core/subdev/mxm/base.c |    9 +++++----
>>  drivers/gpu/drm/nouveau/nouveau_acpi.c         |   23 +++++++++++++----------
>>  drivers/pci/pci-label.c                        |    9 ++++++---
> 
> For the drivers/pci/pci-label.c part,
> 
> Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

Thanks.

> 
>> +       status = acpi_evaluate_object(handle, "_DSM", &input, &output);
>> +       if (ACPI_FAILURE(status)) {
>> +               DRM_DEBUG_DRIVER("failed to evaluate _DSM: %s\n",
>> +                               acpi_format_exception(status));
> 
> It's too bad there isn't an easy way to produce more informative error
> messages, e.g., by including a namespace path or something.  A message
> like:
> 
>     failed to evaluate _DSM: A requested entity is not found
> 
> is only useful if there's enough context to figure out what's going on.

Yes, I will add the namespace path into the debug info, thanks!

> 
> Bjorn
> 
> .
> 


-- 
Thanks!
Yijing

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