[PATCH v2] leds: gpio: Clear error pointers for skipped LEDs

[Steve Dunnagan <sdunnaga@redhat.com>]

gpio_led_get_gpiod() returns an error pointer when a platform-data
LED's GPIO is unavailable. gpio_led_probe() skips registration in that
case, but leaves the error pointer in led_dat->gpiod.

The skipped entry remains included in priv->num_leds. During shutdown,
gpio_led_shutdown() walks those entries and passes the error pointer to
gpio_led_set(), producing:

  gpiod_set_value: invalid GPIO (errorpointer: -ENOENT)

Clear led_dat->gpiod before skipping the LED so skipped entries do not
retain error-valued descriptors.

Fixes: 45d4c6de4e49 ("leds: gpio: Try to lookup gpiod from device")
Suggested-by: Lee Jones <lee@kernel.org>
Assisted-by: ChatGPT:GPT-5.5-Thinking
Signed-off-by: Steve Dunnagan <sdunnaga@redhat.com>
---
Changes in v2:
- Clear led_dat->gpiod in the probe skip path instead of checking for
  error-valued descriptors during shutdown, as suggested by Lee.

Tested on an Orange Pi 5 Plus running Fedora 42 with a test platform
device containing an unavailable GPIO LED. Before the fix, reboot
logged:

  gpiod_set_value: invalid GPIO (errorpointer: -ENOENT)

After the fix, the LED was still skipped during probe, but reboot
completed without the invalid-GPIO warning.

 drivers/leds/leds-gpio.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
index 8ae71c2e91e0..8810fdcf2d77 100644
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -277,6 +277,7 @@ static int gpio_led_probe(struct platform_device *pdev)
 			if (IS_ERR(led_dat->gpiod)) {
 				dev_info(dev, "Skipping unavailable LED gpio %d (%s)\n",
 					 template->gpio, template->name);
+				led_dat->gpiod = NULL;
 				continue;
 			}
 
-- 
2.55.0