linux-kernel - [PATCH] Thermal: Fix bug on generic thermal framework.

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Date:	Mon, 24 Sep 2012 11:05:50 +0900
From:	Jonghwa Lee <jonghwa3.lee@...sung.com>
To:	linux-pml@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Len Brown <len.brown@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Amit Kachhap <amit.kachhap@...aro.org>,
	Durgadoss R <durgadoss.r@...el.com>,
	Jonghwa Lee <jonghwa3.lee@...sung.com>
Subject: [PATCH] Thermal: Fix bug on generic thermal framework.

When system fails to bind cooling devices to thermal zone device during
registering thermal zone device, it leaves registering without canceling
delayed work. It probably makes panic if polling rate is not enough to release
that work from workqueue. So it is better to ignore initialization of polling
work to prevent that unexpected state.

Signed-off-by: Jonghwa Lee <jonghwa3.lee@...sung.com>
---
 drivers/thermal/thermal_sys.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
index 2ab31e4..744e69d 100644
--- a/drivers/thermal/thermal_sys.c
+++ b/drivers/thermal/thermal_sys.c
@@ -1351,12 +1351,14 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
 		}
 	mutex_unlock(&thermal_list_lock);
 
+	if (result)
+		goto unregister;
+
 	INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
 
 	thermal_zone_device_update(tz);
 
-	if (!result)
-		return tz;
+	return tz;
 
 unregister:
 	release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
-- 
1.7.4.1

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