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ACPI: don't check power state after _ON/_OFF

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We used to evaluate _STA to check the power state of a device after
running _ON or _OFF.  But as far as I can tell, there's no benefit
to evaluating _STA, and sometimes we trip over bugs when BIOSes don't
implement _STA correctly.

Yakui says Windows XP doesn't evaluate _STA during power transition.
So let's skip it in Linux, too.  It's conceivable that we'll need to
check _STA in the future for some reason, but until we do, I don't
see a reason to clutter this code path.

References:
    http://bugzilla.kernel.org/show_bug.cgi?id=13243
    http://marc.info/?l=linux-acpi&m=124166053803753&w=2
    http://marc.info/?l=linux-acpi&m=124175761408256&w=2
    http://marc.info/?l=linux-acpi&m=124210593114061&w=2

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Acked-by: Matthew Garrett <mjg59@srcf.ucam.org>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Bjorn Helgaas 2009-05-21 17:28:53 -06:00 committed by Len Brown
parent cd86a536c8
commit bdf43bbf2e
1 changed files with 2 additions and 26 deletions
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28
drivers/acpi/power.c
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@ -194,7 +194,7 @@ static int acpi_power_get_list_state(struct acpi_handle_list *list, int *state)
static int acpi_power_on(acpi_handle handle, struct acpi_device *dev)
{
int result = 0, state;
int result = 0;
int found = 0;
acpi_status status = AE_OK;
struct acpi_power_resource *resource = NULL;
@ -236,18 +236,6 @@ static int acpi_power_on(acpi_handle handle, struct acpi_device *dev)
if (ACPI_FAILURE(status))
return -ENODEV;
if (!acpi_power_nocheck) {
/*
* If acpi_power_nocheck is set, it is unnecessary to check
* the power state after power transition.
*/
result = acpi_power_get_state(resource->device->handle,
&state);
if (result)
return result;
if (state != ACPI_POWER_RESOURCE_STATE_ON)
return -ENOEXEC;
}
/* Update the power resource's _device_ power state */
resource->device->power.state = ACPI_STATE_D0;
@ -258,7 +246,7 @@ static int acpi_power_on(acpi_handle handle, struct acpi_device *dev)
static int acpi_power_off_device(acpi_handle handle, struct acpi_device *dev)
{
int result = 0, state;
int result = 0;
acpi_status status = AE_OK;
struct acpi_power_resource *resource = NULL;
struct list_head *node, *next;
@ -293,18 +281,6 @@ static int acpi_power_off_device(acpi_handle handle, struct acpi_device *dev)
if (ACPI_FAILURE(status))
return -ENODEV;
if (!acpi_power_nocheck) {
/*
* If acpi_power_nocheck is set, it is unnecessary to check
* the power state after power transition.
*/
result = acpi_power_get_state(handle, &state);
if (result)
return result;
if (state != ACPI_POWER_RESOURCE_STATE_OFF)
return -ENOEXEC;
}
/* Update the power resource's _device_ power state */
resource->device->power.state = ACPI_STATE_D3;