diff options
| -rw-r--r-- | drivers/acpi/power.c | 33 |
1 files changed, 20 insertions, 13 deletions
diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c index ac02af419b32..9ac2a9fa90ff 100644 --- a/drivers/acpi/power.c +++ b/drivers/acpi/power.c @@ -145,9 +145,8 @@ static int acpi_power_get_state(acpi_handle handle, int *state) static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state) { - int result = 0, state1; - u32 i = 0; - + int cur_state; + int i = 0; if (!list || !state) return -EINVAL; @@ -155,25 +154,33 @@ static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state) /* The state of the list is 'on' IFF all resources are 'on'. */ for (i = 0; i < list->count; i++) { - /* - * The state of the power resource can be obtained by - * using the ACPI handle. In such case it is unnecessary to - * get the Power resource first and then get its state again. - */ - result = acpi_power_get_state(list->handles[i], &state1); + struct acpi_power_resource *resource; + acpi_handle handle = list->handles[i]; + int result; + + result = acpi_power_get_context(handle, &resource); if (result) return result; - *state = state1; + mutex_lock(&resource->resource_lock); - if (*state != ACPI_POWER_RESOURCE_STATE_ON) + result = acpi_power_get_state(handle, &cur_state); + + mutex_unlock(&resource->resource_lock); + + if (result) + return result; + + if (cur_state != ACPI_POWER_RESOURCE_STATE_ON) break; } ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Resource list is %s\n", - *state ? "on" : "off")); + cur_state ? "on" : "off")); - return result; + *state = cur_state; + + return 0; } static int __acpi_power_on(struct acpi_power_resource *resource) |
