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From:   Denis OSTERLAND <denis.osterland@diehl.com>
To:     "a.zummo@towertech.it" <a.zummo@towertech.it>,
        "alexandre.belloni@free-electrons.com" 
        <alexandre.belloni@free-electrons.com>
CC:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "mgr@pengutronix.de" <mgr@pengutronix.de>,
        "m.grzeschik@pengutronix.de" <m.grzeschik@pengutronix.de>,
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        "linux-rtc@vger.kernel.org" <linux-rtc@vger.kernel.org>,
        "kernel@pengutronix.de" <kernel@pengutronix.de>,
        Denis OSTERLAND <denis.osterland@diehl.com>
Subject: [PATCH v3 1/4] rtc: isl1208: enable interrupt after context
 preparation
Thread-Topic: [PATCH v3 1/4] rtc: isl1208: enable interrupt after context
 preparation
Thread-Index: AQHTtG7affRVgsG8kEWakaUB8ZWDxA==
Date:   Mon, 5 Mar 2018 10:43:53 +0000
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From: Michael Grzeschik <m.grzeschik@pengutronix.de>

The interrupt handler got enabled very early. If the interrupt cause is
triggering immediately before the context is fully prepared. This can
lead to undefined behaviour. Therefor we move the interrupt enable code
to the end of the probe function.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Denis Osterland <Denis.Osterland@diehl.com>
---
 drivers/rtc/rtc-isl1208.c | 34 +++++++++++++++++-----------------
 1 file changed, 17 insertions(+), 17 deletions(-)

diff --git a/drivers/rtc/rtc-isl1208.c b/drivers/rtc/rtc-isl1208.c
index c8b4953..a13a4ba 100644
--- a/drivers/rtc/rtc-isl1208.c
+++ b/drivers/rtc/rtc-isl1208.c
@@ -635,23 +635,6 @@ isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	if (isl1208_i2c_validate_client(client) < 0)
 		return -ENODEV;
 
-	if (client->irq > 0) {
-		rc = devm_request_threaded_irq(&client->dev, client->irq, NULL,
-					       isl1208_rtc_interrupt,
-					       IRQF_SHARED | IRQF_ONESHOT,
-					       isl1208_driver.driver.name,
-					       client);
-		if (!rc) {
-			device_init_wakeup(&client->dev, 1);
-			enable_irq_wake(client->irq);
-		} else {
-			dev_err(&client->dev,
-				"Unable to request irq %d, no alarm support\n",
-				client->irq);
-			client->irq = 0;
-		}
-	}
-
 	rtc = devm_rtc_device_register(&client->dev, isl1208_driver.driver.name,
 				  &isl1208_rtc_ops,
 				  THIS_MODULE);
@@ -674,6 +657,23 @@ isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	if (rc)
 		return rc;
 
+	if (client->irq > 0) {
+		rc = devm_request_threaded_irq(&client->dev, client->irq, NULL,
+					       isl1208_rtc_interrupt,
+					       IRQF_SHARED | IRQF_ONESHOT,
+					       isl1208_driver.driver.name,
+					       client);
+		if (!rc) {
+			device_init_wakeup(&client->dev, 1);
+			enable_irq_wake(client->irq);
+		} else {
+			dev_err(&client->dev,
+				"Unable to request irq %d, no alarm support\n",
+				client->irq);
+			client->irq = 0;
+		}
+	}
+
 	return 0;
 }
 
-- 
2.7.4


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