From 2e14d782c43c17eaeac3cdd6b64c073cc4184b48 Mon Sep 17 00:00:00 2001
From: Frans Pop <elendil@planet.nl>
Date: Mon, 26 Oct 2009 08:39:02 +0100
Subject: [PATCH] --- yaml --- r: 177536 b: refs/heads/master c:
 3d8e3ad879441ae14c5957b933028daf39d252b0 h: refs/heads/master v: v3

---
 [refs]                                    | 2 +-
 trunk/Documentation/thermal/sysfs-api.txt | 1 +
 trunk/drivers/thermal/thermal_sys.c       | 6 ++++++
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index fd6f271de60e..544e1bccf647 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 7fb2616e249184e217f9818a7662596165710ea4
+refs/heads/master: 3d8e3ad879441ae14c5957b933028daf39d252b0
diff --git a/trunk/Documentation/thermal/sysfs-api.txt b/trunk/Documentation/thermal/sysfs-api.txt
index a87dc277a5ca..cb3d15bc1aeb 100644
--- a/trunk/Documentation/thermal/sysfs-api.txt
+++ b/trunk/Documentation/thermal/sysfs-api.txt
@@ -206,6 +206,7 @@ passive
 	passive trip point for the zone. Activation is done by polling with
 	an interval of 1 second.
 	Unit: millidegrees Celsius
+	Valid values: 0 (disabled) or greater than 1000
 	RW, Optional
 
 *****************************
diff --git a/trunk/drivers/thermal/thermal_sys.c b/trunk/drivers/thermal/thermal_sys.c
index 6f8d8f971212..310e40ab00b6 100644
--- a/trunk/drivers/thermal/thermal_sys.c
+++ b/trunk/drivers/thermal/thermal_sys.c
@@ -225,6 +225,12 @@ passive_store(struct device *dev, struct device_attribute *attr,
 	if (!sscanf(buf, "%d\n", &state))
 		return -EINVAL;
 
+	/* sanity check: values below 1000 millicelcius don't make sense
+	 * and can cause the system to go into a thermal heart attack
+	 */
+	if (state && state < 1000)
+		return -EINVAL;
+
 	if (state && !tz->forced_passive) {
 		mutex_lock(&thermal_list_lock);
 		list_for_each_entry(cdev, &thermal_cdev_list, node) {