thermal: core: Use kstrdup_const() during cooling device registration

Some *thermal_cooling_device_register() calls pass a string literal as
the 'type' parameter, so kstrdup_const() can be used instead of
kstrdup() to avoid a memory allocation in such cases.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index abf4c23..dfaa634 100644 (file)
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -845,7 +845,7 @@ static void thermal_release(struct device *dev)
                            sizeof("cooling_device") - 1)) {
                cdev = to_cooling_device(dev);
                thermal_cooling_device_destroy_sysfs(cdev);
-               kfree(cdev->type);
+               kfree_const(cdev->type);
                ida_free(&thermal_cdev_ida, cdev->id);
                kfree(cdev);
        }
@@ -917,7 +917,7 @@ __thermal_cooling_device_register(struct device_node *np,
        cdev->id = ret;
        id = ret;
 
-       cdev->type = kstrdup(type ? type : "", GFP_KERNEL);
+       cdev->type = kstrdup_const(type ? type : "", GFP_KERNEL);
        if (!cdev->type) {
                ret = -ENOMEM;
                goto out_ida_remove;
@@ -970,7 +970,7 @@ __thermal_cooling_device_register(struct device_node *np,
 out_cooling_dev:
        thermal_cooling_device_destroy_sysfs(cdev);
 out_cdev_type:
-       kfree(cdev->type);
+       kfree_const(cdev->type);
 out_ida_remove:
        ida_free(&thermal_cdev_ida, id);
 out_kfree_cdev:

diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 7defea8..3227335 100644 (file)
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -103,7 +103,7 @@ struct thermal_cooling_device_ops {
 
 struct thermal_cooling_device {
        int id;
-       char *type;
+       const char *type;
        unsigned long max_state;
        struct device device;
        struct device_node *np;