linux-kernel - [PATCH 5.11 377/775] watchdog: intel-mid_wdt: Postpone IRQ handler registration till SCU is ready

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Date:   Mon,  1 Mar 2021 17:09:05 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Linus Walleij <linus.walleij@...aro.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.11 377/775] watchdog: intel-mid_wdt: Postpone IRQ handler registration till SCU is ready

From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

[ Upstream commit f285c9532b5bd3de7e37a6203318437cab79bd9a ]

When SCU is not ready and CONFIG_DEBUG_SHIRQ=y we got deferred probe followed
by fired test IRQ which immediately makes kernel panic. Fix this by delaying
IRQ handler registration till SCU is ready.

Fixes: 80ae679b8f86 ("watchdog: intel-mid_wdt: Convert to use new SCU IPC API")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Reviewed-by: Guenter Roeck <linux@...ck-us.net>
Acked-by: Linus Walleij <linus.walleij@...aro.org>
Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/watchdog/intel-mid_wdt.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/watchdog/intel-mid_wdt.c b/drivers/watchdog/intel-mid_wdt.c
index 1ae03b64ef8bf..9b2173f765c8c 100644
--- a/drivers/watchdog/intel-mid_wdt.c
+++ b/drivers/watchdog/intel-mid_wdt.c
@@ -154,6 +154,10 @@ static int mid_wdt_probe(struct platform_device *pdev)
 	watchdog_set_nowayout(wdt_dev, WATCHDOG_NOWAYOUT);
 	watchdog_set_drvdata(wdt_dev, mid);
 
+	mid->scu = devm_intel_scu_ipc_dev_get(dev);
+	if (!mid->scu)
+		return -EPROBE_DEFER;
+
 	ret = devm_request_irq(dev, pdata->irq, mid_wdt_irq,
 			       IRQF_SHARED | IRQF_NO_SUSPEND, "watchdog",
 			       wdt_dev);
@@ -162,10 +166,6 @@ static int mid_wdt_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	mid->scu = devm_intel_scu_ipc_dev_get(dev);
-	if (!mid->scu)
-		return -EPROBE_DEFER;
-
 	/*
 	 * The firmware followed by U-Boot leaves the watchdog running
 	 * with the default threshold which may vary. When we get here
-- 
2.27.0