thermal: of: Fix OF node leak in of_thermal_zone_find() error paths

Terminating for_each_available_child_of_node() loop requires dropping OF
node reference, so bailing out on errors misses this.  Solve the OF node
reference leak with scoped for_each_available_child_of_node_scoped().

Fixes: 3fd6d6e2b4e8 ("thermal/of: Rework the thermal device tree initialization")
Cc: <stable@vger.kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://patch.msgid.link/20240814195823.437597-3-krzysztof.kozlowski@linaro.org
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/thermal/thermal_of.c b/drivers/thermal/thermal_of.c
index b08a9b64718d3ac7f56a34b8e6f63f29d8e88119..1f252692815a18c627614382d0f251339bcc852f 100644 (file)
--- a/drivers/thermal/thermal_of.c
+++ b/drivers/thermal/thermal_of.c
@@ -184,14 +184,14 @@ static struct device_node *of_thermal_zone_find(struct device_node *sensor, int
         * Search for each thermal zone, a defined sensor
         * corresponding to the one passed as parameter
         */
-       for_each_available_child_of_node(np, tz) {
+       for_each_available_child_of_node_scoped(np, child) {
 
                int count, i;
 
-               count = of_count_phandle_with_args(tz, "thermal-sensors",
+               count = of_count_phandle_with_args(child, "thermal-sensors",
                                                   "#thermal-sensor-cells");
                if (count <= 0) {
-                       pr_err("%pOFn: missing thermal sensor\n", tz);
+                       pr_err("%pOFn: missing thermal sensor\n", child);
                        tz = ERR_PTR(-EINVAL);
                        goto out;
                }
@@ -200,18 +200,19 @@ static struct device_node *of_thermal_zone_find(struct device_node *sensor, int
 
                        int ret;
 
-                       ret = of_parse_phandle_with_args(tz, "thermal-sensors",
+                       ret = of_parse_phandle_with_args(child, "thermal-sensors",
                                                         "#thermal-sensor-cells",
                                                         i, &sensor_specs);
                        if (ret < 0) {
-                               pr_err("%pOFn: Failed to read thermal-sensors cells: %d\n", tz, ret);
+                               pr_err("%pOFn: Failed to read thermal-sensors cells: %d\n", child, ret);
                                tz = ERR_PTR(ret);
                                goto out;
                        }
 
                        if ((sensor == sensor_specs.np) && id == (sensor_specs.args_count ?
                                                                  sensor_specs.args[0] : 0)) {
-                               pr_debug("sensor %pOFn id=%d belongs to %pOFn\n", sensor, id, tz);
+                               pr_debug("sensor %pOFn id=%d belongs to %pOFn\n", sensor, id, child);
+                               tz = no_free_ptr(child);
                                goto out;
                        }
                }