[PATCH] leds: lp5860: Return an error for an out-of-range 'reg' property

[Mert Seftali <mertsftl@gmail.com>]

When fwnode_property_read_u32() succeeds but the channel number exceeds
LP5860_MAX_LED, ret is 0. The error path then passes 0 to dev_err_probe()
and returns 0, so an out-of-range "reg" value is silently treated as
success instead of being rejected.

Set ret to -EINVAL in that case so the invalid channel is reported and
propagated as an error.

Fixes: 3daf2c4ef82b ("leds: Add support for TI LP5860 LED driver chip")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <error27@gmail.com>
Closes: https://lore.kernel.org/r/202605210624.3gcr3prk-lkp@intel.com/
Signed-off-by: Mert Seftali <mertsftl@gmail.com>
---
 drivers/leds/rgb/leds-lp5860-core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/leds/rgb/leds-lp5860-core.c b/drivers/leds/rgb/leds-lp5860-core.c
index fd0e2f6e6e0f..9eeb01b3e56a 100644
--- a/drivers/leds/rgb/leds-lp5860-core.c
+++ b/drivers/leds/rgb/leds-lp5860-core.c
@@ -115,6 +115,8 @@ static int lp5860_iterate_subleds(struct lp5860_led *led, struct led_init_data *
 
 		ret = fwnode_property_read_u32(led_node, "reg", &channel);
 		if (ret < 0 || channel > LP5860_MAX_LED) {
+			if (ret >= 0)
+				ret = -EINVAL;
 			dev_err_probe(led->chip->dev, ret,
 				      "%pfwP: 'reg' property is missing. Skipping.\n", led_node);
 			fwnode_handle_put(led_node);
-- 
2.54.0