[patch 26/37] ACPI: suspend: dont let device _PS3 failure prevent suspend

[Greg KH]

2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Len Brown <len.brown@xxxxxxxxx>

commit 19bde778c1fd2574cc020a618d7d576f260271ca upstream.

6328a57401dc5f5cf9931738eb7268fcd8058c49
"Enable PNPACPI _PSx Support, v3"

added a call to acpi_bus_set_power(handle, ACPI_STATE_D3)
to pnpacpi_disable_resource() before the existing call
to evaluate _DIS on the device.

This caused suspend to fail on the system in
http://bugzilla.kernel.org/show_bug.cgi?id=13243
because the sanity check to verify we entered _PS3
failed on the serial port.

As a work-around, that sanity check can be disabled
system-wide with "acpi.power_nocheck=1"

Or perhaps we should just shrug off the _PS3 failure
and carry on with _DIS like we used to -- which is
what this patch does.

Signed-off-by: Len Brown <len.brown@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/pnp/pnpacpi/core.c |    8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

--- a/drivers/pnp/pnpacpi/core.c
+++ b/drivers/pnp/pnpacpi/core.c
@@ -111,11 +111,9 @@ static int pnpacpi_disable_resources(str
 
 	/* acpi_unregister_gsi(pnp_irq(dev, 0)); */
 	ret = 0;
-	if (acpi_bus_power_manageable(handle)) {
-		ret = acpi_bus_set_power(handle, ACPI_STATE_D3);
-		if (ret)
-			return ret;
-	}
+	if (acpi_bus_power_manageable(handle))
+		acpi_bus_set_power(handle, ACPI_STATE_D3);
+		/* continue even if acpi_bus_set_power() fails */
 	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DIS", NULL, NULL)))
 		ret = -ENODEV;
 	return ret;


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