Thermal: Introduce locking for cdev.thermal_instances list.

we need to go over all the thermal_instance list of a cooling device
to decide which cooling state to put the cooling device to.

But at this time, as a cooling device may be referenced in multiple
thermal zones, we need to lock the list first in case
another thermal zone is updating this cooling device.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Reviewed-by: Rafael J. Wysocki <rjw@sisk.pl>
Reviewed-by: Eduardo Valentin <eduardo.valentin@ti.com>
diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
index 6e9d3dc..5be8728 100644
--- a/drivers/thermal/thermal_sys.c
+++ b/drivers/thermal/thermal_sys.c
@@ -799,6 +799,7 @@
 		goto remove_symbol_link;
 
 	mutex_lock(&tz->lock);
+	mutex_lock(&cdev->lock);
 	list_for_each_entry(pos, &tz->thermal_instances, tz_node)
 	    if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 		result = -EEXIST;
@@ -808,6 +809,7 @@
 		list_add_tail(&dev->tz_node, &tz->thermal_instances);
 		list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
 	}
+	mutex_unlock(&cdev->lock);
 	mutex_unlock(&tz->lock);
 
 	if (!result)
@@ -840,14 +842,17 @@
 	struct thermal_instance *pos, *next;
 
 	mutex_lock(&tz->lock);
+	mutex_lock(&cdev->lock);
 	list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
 		if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 			list_del(&pos->tz_node);
 			list_del(&pos->cdev_node);
+			mutex_unlock(&cdev->lock);
 			mutex_unlock(&tz->lock);
 			goto unbind;
 		}
 	}
+	mutex_unlock(&cdev->lock);
 	mutex_unlock(&tz->lock);
 
 	return -ENODEV;
@@ -913,6 +918,7 @@
 	}
 
 	strcpy(cdev->type, type);
+	mutex_init(&cdev->lock);
 	INIT_LIST_HEAD(&cdev->thermal_instances);
 	cdev->ops = ops;
 	cdev->updated = true;
@@ -1016,6 +1022,7 @@
 	if (cdev->updated)
 		return;
 
+	mutex_lock(&cdev->lock);
 	/* Make sure cdev enters the deepest cooling state */
 	list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
 		if (instance->target == THERMAL_NO_TARGET)
@@ -1023,6 +1030,7 @@
 		if (instance->target > target)
 			target = instance->target;
 	}
+	mutex_unlock(&cdev->lock);
 	cdev->ops->set_cur_state(cdev, target);
 	cdev->updated = true;
 }