linux-kernel - [PATCH 9/11] ACPI: Always check if _PRW is present before trying to evaluate it

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Message-Id: <201101062340.00868.rjw@sisk.pl>
Date:	Thu, 6 Jan 2011 23:40:00 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Len Brown <lenb@...nel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	"Linux-pm mailing list" <linux-pm@...ts.linux-foundation.org>,
	Andreas Mohr <andi@...as.de>,
	Maciej Rutecki <maciej.rutecki@...il.com>
Subject: [PATCH 9/11] ACPI: Always check if _PRW is present before trying to evaluate it

From: Rafael J. Wysocki <rjw@...k.pl>

Before evaluating _PRW for devices that are reported as inactive or
not present by their _STA control methods we should check if those
methods are actually present (otherwise the evaulation of _PRW will
obviously fail and a scary message will be printed unnecessarily).

Reported-by: Andreas Mohr <andi@...as.de>
Reported-by: Maciej Rutecki <maciej.rutecki@...il.com>
Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
 drivers/acpi/scan.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

Index: linux-2.6/drivers/acpi/scan.c
===================================================================
--- linux-2.6.orig/drivers/acpi/scan.c
+++ linux-2.6/drivers/acpi/scan.c
@@ -1388,7 +1388,6 @@ static acpi_status acpi_bus_check_add(ac
 	struct acpi_bus_ops *ops = context;
 	int type;
 	unsigned long long sta;
-	struct acpi_device_wakeup wakeup;
 	struct acpi_device *device;
 	acpi_status status;
 	int result;
@@ -1399,7 +1398,13 @@ static acpi_status acpi_bus_check_add(ac
 
 	if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
 	    !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
-		acpi_bus_extract_wakeup_device_power_package(handle, &wakeup);
+		struct acpi_device_wakeup wakeup;
+		acpi_handle temp;
+
+		status = acpi_get_handle(handle, "_PRW", &temp);
+		if (ACPI_SUCCESS(status))
+			acpi_bus_extract_wakeup_device_power_package(handle,
+								     &wakeup);
 		return AE_CTRL_DEPTH;
 	}
 

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