[PATCH] pinctrl: at91: Add error handling for pinctrl_utils_add_map_mux()

[Wentao Liang <vulab@xxxxxxxxxxx>]

In atmel_pctl_dt_subnode_to_map(), the return value of
pinctrl_utils_add_map_mux() needs to be checked, for the function
will fail to associate group when the group map is full. Add error
handling for pinctrl_utils_add_map_mux() to return immediately and
propagate the error code to caller function when the function fails.

Signed-off-by: Wentao Liang <vulab@xxxxxxxxxxx>
---
 drivers/pinctrl/pinctrl-at91-pio4.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/pinctrl-at91-pio4.c b/drivers/pinctrl/pinctrl-at91-pio4.c
index 8b01d312305a..4dcaebc20d99 100644
--- a/drivers/pinctrl/pinctrl-at91-pio4.c
+++ b/drivers/pinctrl/pinctrl-at91-pio4.c
@@ -609,8 +609,10 @@ static int atmel_pctl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
 		if (ret)
 			goto exit;
 
-		pinctrl_utils_add_map_mux(pctldev, map, reserved_maps, num_maps,
+		ret = pinctrl_utils_add_map_mux(pctldev, map, reserved_maps, num_maps,
 					  group, func);
+		if (ret)
+			goto exit;
 
 		if (num_configs) {
 			ret = pinctrl_utils_add_map_configs(pctldev, map,
-- 
2.42.0.windows.2