From 402ac53614bce0c273c73a80339556bf56dd3d39 Mon Sep 17 00:00:00 2001 From: Bjorn Helgaas Date: Mon, 21 Sep 2009 19:30:01 +0000 Subject: [PATCH] ACPI: add acpi_bus_get_status_handle() Add acpi_bus_get_status_handle() so we can get the status of a namespace object before building a struct acpi_device. This removes a use of "device->flags.dynamic_status", a cached indicator of whether _STA exists. It seems simpler and more reliable to just evaluate _STA and catch AE_NOT_FOUND errors. Signed-off-by: Bjorn Helgaas Signed-off-by: Len Brown --- drivers/acpi/bus.c | 49 ++++++++++++++++++----------------------- include/acpi/acpi_bus.h | 2 ++ 2 files changed, 24 insertions(+), 27 deletions(-) diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c index 135fbfe1825c..741191524353 100644 --- a/drivers/acpi/bus.c +++ b/drivers/acpi/bus.c @@ -94,36 +94,33 @@ int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device) EXPORT_SYMBOL(acpi_bus_get_device); -int acpi_bus_get_status(struct acpi_device *device) +acpi_status acpi_bus_get_status_handle(acpi_handle handle, + unsigned long long *sta) { - acpi_status status = AE_OK; - unsigned long long sta = 0; - + acpi_status status; - if (!device) - return -EINVAL; + status = acpi_evaluate_integer(handle, "_STA", NULL, sta); + if (ACPI_SUCCESS(status)) + return AE_OK; - /* - * Evaluate _STA if present. - */ - if (device->flags.dynamic_status) { - status = - acpi_evaluate_integer(device->handle, "_STA", NULL, &sta); - if (ACPI_FAILURE(status)) - return -ENODEV; - STRUCT_TO_INT(device->status) = (int)sta; + if (status == AE_NOT_FOUND) { + *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | + ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING; + return AE_OK; } + return status; +} - /* - * According to ACPI spec some device can be present and functional - * even if the parent is not present but functional. - * In such conditions the child device should not inherit the status - * from the parent. - */ - else - STRUCT_TO_INT(device->status) = - ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | - ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING; +int acpi_bus_get_status(struct acpi_device *device) +{ + acpi_status status; + unsigned long long sta; + + status = acpi_bus_get_status_handle(device->handle, &sta); + if (ACPI_FAILURE(status)) + return -ENODEV; + + STRUCT_TO_INT(device->status) = (int) sta; if (device->status.functional && !device->status.present) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: " @@ -135,10 +132,8 @@ int acpi_bus_get_status(struct acpi_device *device) ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n", device->pnp.bus_id, (u32) STRUCT_TO_INT(device->status))); - return 0; } - EXPORT_SYMBOL(acpi_bus_get_status); void acpi_bus_private_data_handler(acpi_handle handle, diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index bc7a69516dce..670f7f33837e 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -322,6 +322,8 @@ extern void unregister_acpi_bus_notifier(struct notifier_block *nb); int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device); void acpi_bus_data_handler(acpi_handle handle, void *context); +acpi_status acpi_bus_get_status_handle(acpi_handle handle, + unsigned long long *sta); int acpi_bus_get_status(struct acpi_device *device); int acpi_bus_get_power(acpi_handle handle, int *state); int acpi_bus_set_power(acpi_handle handle, int state); -- 2.20.1