linux-kernel - Re: [PATCH] pvpanic: handle missing

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Message-ID: <20150601093322.4ec8de60@nial.brq.redhat.com>
Date:	Mon, 1 Jun 2015 09:33:22 +0200
From:	Igor Mammedov <imammedo@...hat.com>
To:	Radim Krčmář <rkrcmar@...hat.com>
Cc:	linux-kernel@...r.kernel.org, Darren Hart <dvhart@...radead.org>,
	platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH] pvpanic: handle missing _STA correctly

On Fri, 29 May 2015 22:18:52 +0200
Radim Krčmář <rkrcmar@...hat.com> wrote:

> pvpanic was not properly detected when _STA was missing.
> 
> ACPI 6.0 April 2015, 6.3.7 _STA (Status)
>   If a device object (including the processor object) does not have an
>   _STA object, then OSPM assumes that all of the above bits are set
>   (i.e., the device is present, enabled, shown in the UI, and
>   functioning).
> 
> Not adhering to the specification made pvpanic dormant under QEMU 2.3.
> 
> Suggested-by: Igor Mammedov <imammedo@...hat.com>
> Signed-off-by: Radim Krčmář <rkrcmar@...hat.com>
Reviewed-by: Igor Mammedov <imammedo@...hat.com>

> ---
>  drivers/platform/x86/pvpanic.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/platform/x86/pvpanic.c b/drivers/platform/x86/pvpanic.c
> index 073a90a63dbc..7b6860333267 100644
> --- a/drivers/platform/x86/pvpanic.c
> +++ b/drivers/platform/x86/pvpanic.c
> @@ -95,8 +95,7 @@ static int pvpanic_add(struct acpi_device *device)
>  	acpi_status status;
>  	u64 ret;
>  
> -	status = acpi_evaluate_integer(device->handle, "_STA", NULL,
> -				       &ret);
> +	status = acpi_bus_get_status_handle(device->handle, &ret);
>  
>  	if (ACPI_FAILURE(status) || (ret & 0x0B) != 0x0B)
>  		return -ENODEV;

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