[PATCH] pinctrl: imx: scmi: replace custom dt_free_map with pinctrl_utils_free_map

[Xiaolei Wang <xiaoleiwangxiaolei@gmail.com>]

From: Wang Xiaolei <xiaoleiwangxiaolei@gmail.com>

pinctrl_scmi_imx_dt_node_to_map() kmemdup_array()s the pinctrl configs
of every pin into map[i].data.configs.configs, but the driver's own
pinctrl_scmi_imx_dt_free_map() only frees the map array itself. The
pinctrl core releases maps through pinctrl_dt_free_maps(), which calls
dt_free_map(); the duplicated configs are therefore never freed and leak
every time the DT node is parsed, e.g. on each (deferred) probe attempt.

Replace the custom dt_free_map with the core helper
pinctrl_utils_free_map(), which frees the configs of each
PIN_MAP_TYPE_CONFIGS_* map before freeing the map itself. Its
signature matches pinctrl_ops.dt_free_map(), so the driver-specific
implementation can be dropped entirely.

Detected with kmemleak on an i.MX95 board (FRDM-IMX95).

Fixes: b755521fd6eb ("pinctrl: imx: support SCMI pinctrl protocol for i.MX95")
Cc: stable@vger.kernel.org
Signed-off-by: Wang Xiaolei <xiaoleiwangxiaolei@gmail.com>
---
 drivers/pinctrl/freescale/pinctrl-imx-scmi.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/pinctrl/freescale/pinctrl-imx-scmi.c b/drivers/pinctrl/freescale/pinctrl-imx-scmi.c
index 613552e35070..8cbd66950848 100644
--- a/drivers/pinctrl/freescale/pinctrl-imx-scmi.c
+++ b/drivers/pinctrl/freescale/pinctrl-imx-scmi.c
@@ -153,18 +153,12 @@ static int pinctrl_scmi_imx_dt_node_to_map(struct pinctrl_dev *pctldev,
 	return 0;
 }
 
-static void pinctrl_scmi_imx_dt_free_map(struct pinctrl_dev *pctldev,
-					 struct pinctrl_map *map, unsigned int num_maps)
-{
-	kfree(map);
-}
-
 static const struct pinctrl_ops pinctrl_scmi_imx_pinctrl_ops = {
 	.get_groups_count = pinctrl_generic_get_group_count,
 	.get_group_name = pinctrl_generic_get_group_name,
 	.get_group_pins = pinctrl_generic_get_group_pins,
 	.dt_node_to_map = pinctrl_scmi_imx_dt_node_to_map,
-	.dt_free_map = pinctrl_scmi_imx_dt_free_map,
+	.dt_free_map = pinctrl_utils_free_map,
 };
 
 static int pinctrl_scmi_imx_func_set_mux(struct pinctrl_dev *pctldev,
-- 
2.34.1