Re: [PATCH v4 6/6] ACPI: Set hotplug _OST support bit to _OSC

[Shuah Khan <shuahkhan@gmail.com>]

On Wed, 2012-05-23 at 20:25 -0600, Toshi Kani wrote:
> When ACPI_HOTPLUG_OST is defined, set hotplug _OST support bit
> OSC_SB_HOTPLUG_OST_SUPPORT to indicate that the OS supports hotplug
> _OST by calling the platform-wide ACPI Operating System Capabilities
> (_OSC).
> 
> Signed-off-by: Toshi Kani <toshi.kani@hp.com>
> ---
>  drivers/acpi/bus.c |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
> index 3188da3..3d4fc7a 100644
> --- a/drivers/acpi/bus.c
> +++ b/drivers/acpi/bus.c
> @@ -548,6 +548,10 @@ static void acpi_bus_osc_support(void)
>  	capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
>  #endif
>  
> +#ifdef ACPI_HOTPLUG_OST
> +	capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_HOTPLUG_OST_SUPPORT;
> +#endif

Why isn't firmware response to _OSC checked to make sure firmware also
supports _OST? My general comments about compile time switch that is
enabled only a few cases _OST Ejection/Insertion is intended to be used
are applicable here.

-- Shuah




> +
>  	if (!ghes_disable)
>  		capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
>  	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))