Re: [PATCH] pvpanic: handle missing _STA correctly

[Igor Mammedov <imammedo@redhat.com>]

On Fri, 29 May 2015 22:18:52 +0200
Radim Krčmář <rkrcmar@redhat.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@redhat.com>
> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.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;