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authorJohn Stultz <john.stultz@linaro.org>2011-05-06 17:26:25 -0700
committerJohn Stultz <john.stultz@linaro.org>2011-05-06 18:02:00 -0700
commit2f5c4fe8f9811152d69ef5cd020e095a1f84ca65 (patch)
tree8a761a6772cbeae7d9661b29e55a7a9965719178
parenta015dbc110a97ed3147546a9c914f18f71d798d0 (diff)
rtc: max8925: 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@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>
-rw-r--r--drivers/rtc/rtc-max8925.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/rtc/rtc-max8925.c b/drivers/rtc/rtc-max8925.c
index 20494b5edc3..3bc046f427e 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;
out_rtc:
+ platform_set_drvdata(pdev, NULL);
free_irq(chip->irq_base + MAX8925_IRQ_RTC_ALARM0, info);
out_irq:
kfree(info);