[PATCH v2 2/2] watchdog: stm32_iwdg: Propagate errors from optional IRQ lookup

[phucduc.bui at gmail.com]

From: bui duc phuc <phucduc.bui at gmail.com>

platform_get_irq_optional() returns a positive IRQ number on success or
a negative error code on failure. For an optional IRQ, -ENXIO indicates
that no IRQ is available, while other errors should be propagated.

Propagate errors such as -EPROBE_DEFER and -EINVAL instead of continuing
probe without the IRQ.

Signed-off-by: bui duc phuc <phucduc.bui at gmail.com>
---

Link v1:
https://lore.kernel.org/all/20260806062812.26523-2-phucduc.bui@gmail.com/
Changes in v2:
 - Update the commit message and error handling.
 - Propagate all errors from platform_get_irq_optional() except -ENXIO,
   instead of only handling -EPROBE_DEFER.

 drivers/watchdog/stm32_iwdg.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/watchdog/stm32_iwdg.c b/drivers/watchdog/stm32_iwdg.c
index b356a272ff9a..a8d2db2d3cf8 100644
--- a/drivers/watchdog/stm32_iwdg.c
+++ b/drivers/watchdog/stm32_iwdg.c
@@ -287,8 +287,11 @@ static int stm32_iwdg_irq_init(struct platform_device *pdev,
 		return 0;
 
 	irq = platform_get_irq_optional(pdev, 0);
-	if (irq <= 0)
+	if (irq < 0) {
+		if (irq != -ENXIO)
+			return irq;
 		return 0;
+	}
 
 	if (of_property_read_bool(np, "wakeup-source")) {
 		ret = devm_device_init_wakeup(dev);
-- 
2.43.0