Commit 660b1113 authored by Rafael J. Wysocki's avatar Rafael J. Wysocki
Browse files

ACPI / PM: Fix consistency check for power resources during resume 



During system resume we check if there are power resources that have
been turned off by the BIOS, but our reference counters for them
are nonzero (they need to be turned on then).  It turns out, however,
that we also need to check the opposite, i.e. if there are power
resources that have been turned on by the BIOS, but our reference
counters for them are zero (which means that no devices are going
to need them any time soon) and we should turn them off.

Make the power resources resume code do the additional check and
turn off the unused power resources as appropriate.

This change has been tested on HP nx6325.

Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 18a38709

drivers/acpi/power.c

+26 −11
Original line number Diff line number Diff line
@@ -299,9 +299,22 @@ static int acpi_power_on(struct acpi_power_resource *resource) 
	return result;

}



static int __acpi_power_off(struct acpi_power_resource *resource)

{

	acpi_status status;



	status = acpi_evaluate_object(resource->device.handle, "_OFF",

				      NULL, NULL);

	if (ACPI_FAILURE(status))

		return -ENODEV;



	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned off\n",

			  resource->name));

	return 0;

}



static int acpi_power_off(struct acpi_power_resource *resource)

{

	acpi_status status = AE_OK;

	int result = 0;



	mutex_lock(&resource->resource_lock);
@@ -317,17 +330,12 @@ static int acpi_power_off(struct acpi_power_resource *resource) 
		ACPI_DEBUG_PRINT((ACPI_DB_INFO,

				  "Power resource [%s] still in use\n",

				  resource->name));

		goto unlock;

	} else {

		result = __acpi_power_off(resource);

		if (result)

			resource->ref_count++;

	}



	status = acpi_evaluate_object(resource->device.handle, "_OFF", NULL, NULL);

	if (ACPI_FAILURE(status))

		result = -ENODEV;

	else

		ACPI_DEBUG_PRINT((ACPI_DB_INFO,

				  "Power resource [%s] turned off\n",

				  resource->name));



 unlock:

	mutex_unlock(&resource->resource_lock);
@@ -851,10 +859,17 @@ void acpi_resume_power_resources(void) 
		mutex_lock(&resource->resource_lock);



		result = acpi_power_get_state(resource->device.handle, &state);

		if (!result && state == ACPI_POWER_RESOURCE_STATE_OFF

		if (result)

			continue;



		if (state == ACPI_POWER_RESOURCE_STATE_OFF

		    && resource->ref_count) {

			dev_info(&resource->device.dev, "Turning ON\n");

			__acpi_power_on(resource);

		} else if (state == ACPI_POWER_RESOURCE_STATE_ON

		    && !resource->ref_count) {

			dev_info(&resource->device.dev, "Turning OFF\n");

			__acpi_power_off(resource);

		}



		mutex_unlock(&resource->resource_lock);

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