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authorJohn Stultz <john.stultz@linaro.org>2011-05-07 04:21:12 +0400
committerJohn Stultz <john.stultz@linaro.org>2011-05-07 04:42:47 +0400
commit9a281a677c1dbf25943b5bc3225de21fcb4945ae (patch)
tree2923528b76a0f27e6244ff58daf4c80cb3e32f20 /drivers/rtc
parent92d921c5def1a7b1411bc54859c0771b2cf2c08d (diff)
downloadlinux-9a281a677c1dbf25943b5bc3225de21fcb4945ae.tar.xz
rtc: ds1286: 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>
Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/rtc-ds1286.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/rtc/rtc-ds1286.c b/drivers/rtc/rtc-ds1286.c
index 60ce69600828..47e681df31e2 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: