[PATCH v3] watchdog: orion_wdt: Propagate errors from optional IRQ lookup

From: bui duc phuc <[email protected]>

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 <[email protected]>
---

Link v2 : 
https://lore.kernel.org/all/[email protected]/

Changes in v3:
 - Use goto disable_clk instead of returning directly.
 - Add similar error handling for the second platform_get_irq_optional() call.

 drivers/watchdog/orion_wdt.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/watchdog/orion_wdt.c b/drivers/watchdog/orion_wdt.c
index 0e145f762f6f..6715186aeac4 100644
--- a/drivers/watchdog/orion_wdt.c
+++ b/drivers/watchdog/orion_wdt.c
@@ -606,6 +606,10 @@ static int orion_wdt_probe(struct platform_device *pdev)
 
 	/* Request the IRQ only after the watchdog is disabled */
 	irq = platform_get_irq_optional(pdev, 0);
+	if (irq < 0 && irq != -ENXIO) {
+		ret = irq;
+		goto disable_clk;
+	}
 	if (irq > 0) {
 		/*
 		 * Not all supported platforms specify an interrupt for the
@@ -621,6 +625,10 @@ static int orion_wdt_probe(struct platform_device *pdev)
 
 	/* Optional 2nd interrupt for pretimeout */
 	irq = platform_get_irq_optional(pdev, 1);
+	if (irq < 0 && irq != -ENXIO) {
+		ret = irq;
+		goto disable_clk;
+	}
 	if (irq > 0) {
 		orion_wdt_info.options |= WDIOF_PRETIMEOUT;
 		ret = devm_request_irq(&pdev->dev, irq, orion_wdt_pre_irq,
-- 
2.43.0