[PATCH 24/52] ACPI: Add _OST support for ACPI container hotplug

Len Brown
2012-07-25T03:42:50Z

From: Toshi Kani <toshi.kani@hp.com>

Changed container_notify_cb() to call ACPI _OST method when ACPI
container hotplug operation has completed. Slightly restructured
the code with the same logic. The function sets eject_pending bit
for an eject request since it does not initiate hot-remove operation.
This bit is checked by the sysfs eject handler to determine if the
request is originated from an ACPI eject notification.

Signed-off-by: Toshi Kani <toshi.kani@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
---
drivers/acpi/container.c | 43 ++++++++++++++++++++++++++++---------------
1 file changed, 28 insertions(+), 15 deletions(-)

diff --git a/drivers/acpi/container.c b/drivers/acpi/container.c
index 45cd03b..1f9f7d7 100644
--- a/drivers/acpi/container.c
+++ b/drivers/acpi/container.c
@@ -158,9 +158,7 @@ static void container_notify_cb(acpi_handle handle, u32 type, void *context)
int result;
int present;
acpi_status status;
-
-
- present = is_device_present(handle);
+ u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */

switch (type) {
case ACPI_NOTIFY_BUS_CHECK:
@@ -169,32 +167,47 @@ static void container_notify_cb(acpi_handle handle, u32 type, void *context)
printk(KERN_WARNING "Container driver received %s event\n",
(type == ACPI_NOTIFY_BUS_CHECK) ?
"ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
+
+ present = is_device_present(handle);
status = acpi_bus_get_device(handle, &device);
- if (present) {
- if (ACPI_FAILURE(status) || !device) {
- result = container_device_add(&device, handle);
- if (!result)
- kobject_uevent(&device->dev.kobj,
- KOBJ_ONLINE);
- else
- printk(KERN_WARNING
- "Failed to add container\n");
- }
- } else {
+ if (!present) {
if (ACPI_SUCCESS(status)) {
/* device exist and this is a remove request */
+ device->flags.eject_pending = 1;
kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
+ return;
}
+ break;
+ }
+
+ if (!ACPI_FAILURE(status) || device)
+ break;
+
+ result = container_device_add(&device, handle);
+ if (result) {
+ printk(KERN_WARNING "Failed to add container\n");
+ break;
}
+
+ kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
+ ost_code = ACPI_OST_SC_SUCCESS;
break;
+
case ACPI_NOTIFY_EJECT_REQUEST:
if (!acpi_bus_get_device(handle, &device) && device) {
+ device->flags.eject_pending = 1;
kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
+ return;
}
break;
+
default:
- break;
+ /* non-hotplug event; possibly handled by other handler */
+ return;
}
+
+ /* Inform firmware that the hotplug operation has completed */
+ (void) acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL);
return;
}

--
1.7.12.rc0