| Submitter | John Stultz |
|---|---|
| Date | May 7, 2011, 1:20 a.m. |
| Message ID | <1304731254-3238-5-git-send-email-john.stultz@linaro.org> |
| Download | mbox | patch |
| Permalink | /patch/94449/ |
| State | New |
| Headers | show |
Comments
Patch
diff --git a/drivers/rtc/rtc-ds1286.c b/drivers/rtc/rtc-ds1286.c index 60ce696..47e681d 100644 --- a/drivers/rtc/rtc-ds1286.c +++ b/drivers/rtc/rtc-ds1286.c @@ -355,6 +355,7 @@ static int __devinit ds1286_probe(struct platform_device *pdev) goto out; } spin_lock_init(&priv->lock); + platform_set_drvdata(pdev, priv); rtc = rtc_device_register("ds1286", &pdev->dev, &ds1286_ops, THIS_MODULE); if (IS_ERR(rtc)) { @@ -362,7 +363,6 @@ static int __devinit ds1286_probe(struct platform_device *pdev) goto out; } priv->rtc = rtc; - platform_set_drvdata(pdev, priv); return 0; out:
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> --- drivers/rtc/rtc-ds1286.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)