linux-kernel - [PATCH 4.9 099/104] thermal/drivers/hisi: Fix kernel panic on alarm interrupt

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Message-Id: <20171222084617.234414851@linuxfoundation.org>
Date:   Fri, 22 Dec 2017 09:47:05 +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, Daniel Lezcano <daniel.lezcano@...aro.org>,
        Leo Yan <leo.yan@...aro.org>,
        Eduardo Valentin <edubezval@...il.com>,
        Kevin Wangtao <kevin.wangtao@...ilicon.com>
Subject: [PATCH 4.9 099/104] thermal/drivers/hisi: Fix kernel panic on alarm interrupt

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Daniel Lezcano <daniel.lezcano@...aro.org>

commit 2cb4de785c40d4a2132cfc13e63828f5a28c3351 upstream.

The threaded interrupt for the alarm interrupt is requested before the
temperature controller is setup. This one can fire an interrupt immediately
leading to a kernel panic as the sensor data is not initialized.

In order to prevent that, move the threaded irq after the Tsensor is setup.

Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Reviewed-by: Leo Yan <leo.yan@...aro.org>
Tested-by: Leo Yan <leo.yan@...aro.org>
Signed-off-by: Eduardo Valentin <edubezval@...il.com>
Signed-off-by: Kevin Wangtao <kevin.wangtao@...ilicon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/thermal/hisi_thermal.c |   18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

--- a/drivers/thermal/hisi_thermal.c
+++ b/drivers/thermal/hisi_thermal.c
@@ -317,15 +317,6 @@ static int hisi_thermal_probe(struct pla
 	if (data->irq < 0)
 		return data->irq;
 
-	ret = devm_request_threaded_irq(&pdev->dev, data->irq,
-					hisi_thermal_alarm_irq,
-					hisi_thermal_alarm_irq_thread,
-					0, "hisi_thermal", data);
-	if (ret < 0) {
-		dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
-		return ret;
-	}
-
 	platform_set_drvdata(pdev, data);
 
 	data->clk = devm_clk_get(&pdev->dev, "thermal_clk");
@@ -357,6 +348,15 @@ static int hisi_thermal_probe(struct pla
 			hisi_thermal_toggle_sensor(&data->sensors[i], true);
 	}
 
+	ret = devm_request_threaded_irq(&pdev->dev, data->irq,
+					hisi_thermal_alarm_irq,
+					hisi_thermal_alarm_irq_thread,
+					0, "hisi_thermal", data);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
+		return ret;
+	}
+
 	enable_irq(data->irq);
 
 	return 0;