thermal: core: prevent zones with no types to be registered

There are APIs that rely on tz->type. This patch
prevent thermal zones without it to be registered.

Cc: Zhang Rui <rui.zhang@intel.com>
Cc: linux-pm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 226b0b4..ec0d158 100644 (file)
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -1873,6 +1873,9 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
        int passive = 0;
        struct thermal_governor *governor;
 
+       if (!type || strlen(type) == 0)
+               return ERR_PTR(-EINVAL);
+
        if (type && strlen(type) >= THERMAL_NAME_LENGTH)
                return ERR_PTR(-EINVAL);
 
@@ -1898,7 +1901,7 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
                return ERR_PTR(result);
        }
 
-       strlcpy(tz->type, type ? : "", sizeof(tz->type));
+       strlcpy(tz->type, type, sizeof(tz->type));
        tz->ops = ops;
        tz->tzp = tzp;
        tz->device.class = &thermal_class;
@@ -1918,11 +1921,9 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
        }
 
        /* sys I/F */
-       if (type) {
-               result = device_create_file(&tz->device, &dev_attr_type);
-               if (result)
-                       goto unregister;
-       }
+       result = device_create_file(&tz->device, &dev_attr_type);
+       if (result)
+               goto unregister;
 
        result = device_create_file(&tz->device, &dev_attr_temp);
        if (result)
@@ -2071,8 +2072,7 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
 
        thermal_zone_device_set_polling(tz, 0);
 
-       if (tz->type[0])
-               device_remove_file(&tz->device, &dev_attr_type);
+       device_remove_file(&tz->device, &dev_attr_type);
        device_remove_file(&tz->device, &dev_attr_temp);
        if (tz->ops->get_mode)
                device_remove_file(&tz->device, &dev_attr_mode);