[08/11] rtc: msm6242: Initialize drvdata before registering device

Message ID 1304731254-3238-9-git-send-email-john.stultz@linaro.org
State Accepted
Headers show

Commit Message

John Stultz May 7, 2011, 1:20 a.m.
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

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

CC: Wolfram Sang <w.sang@pengutronix.de>
CC: Alessandro Zummo <a.zummo@towertech.it>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: rtc-linux@googlegroups.com
Signed-off-by: John Stultz <john.stultz@linaro.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,
@@ -223,10 +224,10 @@  static int __init msm6242_rtc_probe(struct platform_device *dev)
 	priv->rtc = rtc;
-	platform_set_drvdata(dev, priv);
 	return 0;
+	platform_set_drvdata(dev, NULL);