linux-kernel - [PATCH 08/11] rtc: msm6242: Initialize drvdata before registering device

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Date:	Fri,  6 May 2011 18:20:51 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	lkml <linux-kernel@...r.kernel.org>
Cc:	John Stultz <john.stultz@...aro.org>,
	Wolfram Sang <w.sang@...gutronix.de>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Thomas Gleixner <tglx@...utronix.de>,
	rtc-linux@...glegroups.com
Subject: [PATCH 08/11] rtc: msm6242: Initialize drvdata before registering device

Commit f44f7f96a20 ("RTC: Initialize kernel state from RTC") uncovered
an issue in a number of RTC drivers, where the drivers call
rtc_device_register before initializing the device or platform drvdata.

This frequently results in null pointer dereferences when the
rtc_device_register immediately makes use of the rtc device, calling
rtc_read_alarm.

The solution is to ensure the drvdata is initialized prior to registering
the rtc device.

CC: Wolfram Sang <w.sang@...gutronix.de>
CC: Alessandro Zummo <a.zummo@...ertech.it>
CC: Thomas Gleixner <tglx@...utronix.de>
CC: rtc-linux@...glegroups.com
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 drivers/rtc/rtc-msm6242.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/rtc/rtc-msm6242.c b/drivers/rtc/rtc-msm6242.c
index 6782062..fcb113c 100644
--- a/drivers/rtc/rtc-msm6242.c
+++ b/drivers/rtc/rtc-msm6242.c
@@ -214,6 +214,7 @@ static int __init msm6242_rtc_probe(struct platform_device *dev)
 		error = -ENOMEM;
 		goto out_free_priv;
 	}
+	platform_set_drvdata(dev, priv);
 
 	rtc = rtc_device_register("rtc-msm6242", &dev->dev, &msm6242_rtc_ops,
 				  THIS_MODULE);
@@ -223,10 +224,10 @@ static int __init msm6242_rtc_probe(struct platform_device *dev)
 	}
 
 	priv->rtc = rtc;
-	platform_set_drvdata(dev, priv);
 	return 0;
 
 out_unmap:
+	platform_set_drvdata(dev, NULL);
 	iounmap(priv->regs);
 out_free_priv:
 	kfree(priv);
-- 
1.7.3.2.146.gca209

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