linux-kernel - [PATCH 1/2] watchdog: pm8916_wdt: fix pretimeout registration flow

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Message-Id: <20190906203054.26725-1-jorge.ramirez-ortiz@linaro.org>
Date:   Fri,  6 Sep 2019 22:30:53 +0200
From:   Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@...aro.org>
To:     jorge.ramirez-ortiz@...aro.org, wim@...ux-watchdog.org,
        linux@...ck-us.net
Cc:     linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        bjorn.andersson@...aro.org
Subject: [PATCH 1/2] watchdog: pm8916_wdt: fix pretimeout registration flow

When an IRQ is present in the dts, the probe function shall fail if
the interrupt can not be registered.

The probe function shall also be retried if getting the irq is being
deferred.

Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@...aro.org>
---
 drivers/watchdog/pm8916_wdt.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/watchdog/pm8916_wdt.c b/drivers/watchdog/pm8916_wdt.c
index 2d3652004e39..cb5304c26ac3 100644
--- a/drivers/watchdog/pm8916_wdt.c
+++ b/drivers/watchdog/pm8916_wdt.c
@@ -163,9 +163,18 @@ static int pm8916_wdt_probe(struct platform_device *pdev)
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq > 0) {
-		if (devm_request_irq(dev, irq, pm8916_wdt_isr, 0, "pm8916_wdt",
-				     wdt))
-			irq = 0;
+		err = devm_request_irq(dev, irq, pm8916_wdt_isr, 0,
+				       "pm8916_wdt", wdt);
+		if (err)
+			return err;
+
+		wdt->wdev.info = &pm8916_wdt_pt_ident;
+
+	} else {
+		if (irq == -EPROBE_DEFER)
+			return -EPROBE_DEFER;
+
+		wdt->wdev.info = &pm8916_wdt_ident;
 	}
 
 	/* Configure watchdog to hard-reset mode */
@@ -177,7 +186,6 @@ static int pm8916_wdt_probe(struct platform_device *pdev)
 		return err;
 	}
 
-	wdt->wdev.info = (irq > 0) ? &pm8916_wdt_pt_ident : &pm8916_wdt_ident,
 	wdt->wdev.ops = &pm8916_wdt_ops,
 	wdt->wdev.parent = dev;
 	wdt->wdev.min_timeout = PM8916_WDT_MIN_TIMEOUT;
-- 
2.23.0