[PATCH] pinctrl: just return if no valid maps

[lijiazi <jqqlijiazi@xxxxxxxxx>]

If there is a problem with a pinctrl node of a device,
for example, config child node do not have prop specified in
dt_params, num_maps maybe 0. On this condition, no need remember
this map.

Signed-off-by: lijiazi <lijiazi@xxxxxxxxxx>
---
 drivers/pinctrl/devicetree.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/pinctrl/devicetree.c b/drivers/pinctrl/devicetree.c
index 5d6d8b1..dedf450 100644
--- a/drivers/pinctrl/devicetree.c
+++ b/drivers/pinctrl/devicetree.c
@@ -147,6 +147,14 @@ static int dt_to_map_one_config(struct pinctrl *p,
 	ret = ops->dt_node_to_map(pctldev, np_config, &map, &num_maps);
 	if (ret < 0)
 		return ret;
+	else if (num_maps == 0) {
+		/* if no valid maps, maybe caused by empty pinctrl node
+		 * or typing error, no need remember, just return
+		 */
+		dev_info(p->dev,
+			"there is not valid maps for state %s\n", statename);
+		return 0;
+	}
 
 	/* Stash the mapping table chunk away for later use */
 	return dt_remember_or_free_map(p, statename, pctldev, map, num_maps);
-- 
2.7.4