ACPI: Oops in ACPI with git latest

ACPI Warning (nseval-0168): Insufficient arguments - method [_OSC] needs 5, found 4 [20080926]
ACPI Warning (nspredef-0252): \_SB_.PCI0._OSC: Parameter count mismatch - ASL declared 5, expected 4 [20080926]
ACPI Error (nspredef-0163): \_SB_.PCI0._OSC: Missing expected return value [20080926]
BUG: unable to handle kernel NULL pointer dereference at 00000000
IP: [<c0237671>] acpi_run_osc+0xa1/0x170

Signed-off-by: Rafael J. Wysocki <[email protected]>
Tested-by: James Bottomley <[email protected]>
Signed-off-by: Len Brown <[email protected]>

Author: rjwysocki

drivers/pci/pci-acpi.c

@@ -83,6 +83,9 @@ static acpi_status acpi_run_osc(acpi_handle handle,
 	if (ACPI_FAILURE(status))
 		return status;
 
+	if (!output.length)
+		return AE_NULL_OBJECT;
+
 	out_obj = output.pointer;
 	if (out_obj->type != ACPI_TYPE_BUFFER) {
 		printk(KERN_DEBUG "Evaluate _OSC returns wrong type\n");