[PATCH 3/3] Thermal: do thermal zone update after a cooling device registered

From: Chen Yu
Date: Sun Sep 27 2015 - 01:45:58 EST

From: Zhang Rui <rui.zhang@xxxxxxxxx>

When a new cooling device is registered, we need to update the
thermal zone to set the new registered cooling device to a proper

This fixes a problem that the system is cool, while the fan devices
are left running on full speed after boot, if fan device is registered
after thermal zone device.

CC: <stable@xxxxxxxxxxxxxxx> #3.18+
Tested-by: Manuel Krause <manuelkrause@xxxxxxxxxxxx>
Tested-by: szegad <szegadlo@xxxxxxxxxxxxxx>
Tested-by: prash <prash.n.rao@xxxxxxxxx>
Tested-by: amish <ammdispose-arch@xxxxxxxxx>
Signed-off-by: Zhang Rui <rui.zhang@xxxxxxxxx>
Signed-off-by: Chen Yu <yu.c.chen@xxxxxxxxx>
drivers/thermal/thermal_core.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index c3bdb48..09c78a4 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -1450,6 +1450,7 @@ __thermal_cooling_device_register(struct device_node *np,
const struct thermal_cooling_device_ops *ops)
struct thermal_cooling_device *cdev;
+ struct thermal_instance *pos, *next;
int result;

if (type && strlen(type) >= THERMAL_NAME_LENGTH)
@@ -1494,6 +1495,15 @@ __thermal_cooling_device_register(struct device_node *np,
/* Update binding information for 'this' new cdev */

+ list_for_each_entry_safe(pos, next, &cdev->thermal_instances, cdev_node) {
+ if (next->cdev_node.next == &cdev->thermal_instances) {
+ thermal_zone_device_update(next->tz);
+ break;
+ }
+ if (pos->tz != next->tz)
+ thermal_zone_device_update(pos->tz);
+ }
return cdev;


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