[PATCH 2/2] watchdog: stm32_iwdg: Propagate -EPROBE_DEFER from IRQ lookup

[phucduc.bui@gmail.com]

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

platform_get_irq_optional() does not returns 0. It returns a positive
IRQ number on success or a negative error code on failure.

Return -EPROBE_DEFER from platform_get_irq_optional() so the driver is
re-probed when the interrupt resource becomes available instead of
continuing probe without an IRQ.

Signed-off-by: bui duc phuc <phucduc.bui@gmail.com>
---
 drivers/watchdog/stm32_iwdg.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/watchdog/stm32_iwdg.c b/drivers/watchdog/stm32_iwdg.c
index b356a272ff9a..102f51084957 100644
--- a/drivers/watchdog/stm32_iwdg.c
+++ b/drivers/watchdog/stm32_iwdg.c
@@ -287,7 +287,9 @@ static int stm32_iwdg_irq_init(struct platform_device *pdev,
 		return 0;
 
 	irq = platform_get_irq_optional(pdev, 0);
-	if (irq <= 0)
+	if (irq == -EPROBE_DEFER)
+		return irq;
+	if (irq < 0)
 		return 0;
 
 	if (of_property_read_bool(np, "wakeup-source")) {
-- 
2.43.0