From: phucduc.bui@gmail.com
To: Wim Van Sebroeck <wim@linux-watchdog.org>,
	Guenter Roeck <linux@roeck-us.net>,
	linux-watchdog@vger.kernel.org
Cc: linux-arm-msm@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	bui duc phuc <phucduc.bui@gmail.com>
Subject: [PATCH v3] watchdog: qcom: Propagate errors from optional IRQ lookup
Date: Mon, 10 Aug 2026 17:51:01 +0700
Message-ID: <20260810105101.55945-1-phucduc.bui@gmail.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

From: bui duc phuc <phucduc.bui@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.

Instead of only checking for -EPROBE_DEFER, propagate all error codes
returned by platform_get_irq_optional() other than -ENXIO, so that
failures are properly reported to the caller.

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

Link v1 : 
https://lore.kernel.org/all/20260807081652.38692-1-phucduc.bui@gmail.com/
Changes in v2 : 
 - Update pretimeout handling based on Guenter's review.

Link v2 : 
https://lore.kernel.org/all/20260810102144.51663-1-phucduc.bui@gmail.com/
Changes in v3:
 - Update the handling of wdt->wdd.info based on Sashiko's review.


 drivers/watchdog/qcom-wdt.c | 27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)

diff --git a/drivers/watchdog/qcom-wdt.c b/drivers/watchdog/qcom-wdt.c
index 49bd04841f0c..74ac3c507c01 100644
--- a/drivers/watchdog/qcom-wdt.c
+++ b/drivers/watchdog/qcom-wdt.c
@@ -287,21 +287,22 @@ static int qcom_wdt_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
+	wdt->wdd.info = &qcom_wdt_info;
+
 	/* check if there is pretimeout support */
-	irq = platform_get_irq_optional(pdev, 0);
-	if (data->pretimeout && irq > 0) {
-		ret = devm_request_irq(dev, irq, qcom_wdt_isr, 0,
-				       "wdt_bark", &wdt->wdd);
-		if (ret)
-			return ret;
+	if (data->pretimeout) {
+		irq = platform_get_irq_optional(pdev, 0);
+		if (irq < 0 && irq != -ENXIO)
+			return irq;
+		if (irq > 0) {
+			ret = devm_request_irq(dev, irq, qcom_wdt_isr, 0,
+					       "wdt_bark", &wdt->wdd);
+			if (ret)
+				return ret;
 
-		wdt->wdd.info = &qcom_wdt_pt_info;
-		wdt->wdd.pretimeout = 1;
-	} else {
-		if (irq == -EPROBE_DEFER)
-			return -EPROBE_DEFER;
-
-		wdt->wdd.info = &qcom_wdt_info;
+			wdt->wdd.info = &qcom_wdt_pt_info;
+			wdt->wdd.pretimeout = 1;
+		}
 	}
 
 	wdt->wdd.ops = &qcom_wdt_ops;
-- 
2.43.0