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    Subject[PATCH 3/4] ACPI: Add _OST support for ACPI CPU hotplug
    Date
    Changed acpi_processor_hotplug_notify() to call ACPI _OST method
    when ACPI-based CPU hotplug operation completed.

    Signed-off-by: Toshi Kani <toshi.kani@hp.com>
    ---
    drivers/acpi/processor_driver.c | 28 ++++++++++++++++++++--------
    1 files changed, 20 insertions(+), 8 deletions(-)

    diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
    index 0734086..5d9b5a8 100644
    --- a/drivers/acpi/processor_driver.c
    +++ b/drivers/acpi/processor_driver.c
    @@ -701,9 +701,9 @@ static void acpi_processor_hotplug_notify(acpi_handle handle,
    {
    struct acpi_processor *pr;
    struct acpi_device *device = NULL;
    + u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
    int result;

    -
    switch (event) {
    case ACPI_NOTIFY_BUS_CHECK:
    case ACPI_NOTIFY_DEVICE_CHECK:
    @@ -715,14 +715,18 @@ static void acpi_processor_hotplug_notify(acpi_handle handle,
    if (!is_processor_present(handle))
    break;

    - if (acpi_bus_get_device(handle, &device)) {
    - result = acpi_processor_device_add(handle, &device);
    - if (result)
    - printk(KERN_ERR PREFIX
    - "Unable to add the device\n");
    + if (!acpi_bus_get_device(handle, &device))
    + break;
    +
    + result = acpi_processor_device_add(handle, &device);
    + if (result) {
    + printk(KERN_ERR PREFIX "Unable to add the device\n");
    break;
    }
    +
    + ost_code = ACPI_OST_SC_SUCCESS;
    break;
    +
    case ACPI_NOTIFY_EJECT_REQUEST:
    ACPI_DEBUG_PRINT((ACPI_DB_INFO,
    "received ACPI_NOTIFY_EJECT_REQUEST\n"));
    @@ -736,15 +740,23 @@ static void acpi_processor_hotplug_notify(acpi_handle handle,
    if (!pr) {
    printk(KERN_ERR PREFIX
    "Driver data is NULL, dropping EJECT\n");
    - return;
    + break;
    }
    +
    + /* REVISIT: update when eject is supported */
    + ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
    break;
    +
    default:
    ACPI_DEBUG_PRINT((ACPI_DB_INFO,
    "Unsupported event [0x%x]\n", event));
    - break;
    +
    + /* non-hotplug event; possibly handled by other handler */
    + return;
    }

    + /* Inform firmware that the hotplug operation has completed */
    + (void) acpi_evaluate_ost(handle, event, ost_code, NULL);
    return;
    }

    --
    1.7.7.6


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