[06/11] rtc: max8925: Initialize drvdata before registering device

Message ID 1304731254-3238-7-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-max8925.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)


diff --git a/drivers/rtc/rtc-max8925.c b/drivers/rtc/rtc-max8925.c
index 20494b5..3bc046f 100644
--- a/drivers/rtc/rtc-max8925.c
+++ b/drivers/rtc/rtc-max8925.c
@@ -258,6 +258,8 @@  static int __devinit max8925_rtc_probe(struct platform_device *pdev)
 	dev_set_drvdata(&pdev->dev, info);
+	/* XXX - isn't this redundant? */
+	platform_set_drvdata(pdev, info);
 	info->rtc_dev = rtc_device_register("max8925-rtc", &pdev->dev,
 					&max8925_rtc_ops, THIS_MODULE);
@@ -267,10 +269,9 @@  static int __devinit max8925_rtc_probe(struct platform_device *pdev)
 		goto out_rtc;
-	platform_set_drvdata(pdev, info);
 	return 0;
+	platform_set_drvdata(pdev, NULL);
 	free_irq(chip->irq_base + MAX8925_IRQ_RTC_ALARM0, info);