Commit-ID: 93015236d92bf9ea746c0b10c3c1d9058cb11f82
Gitweb: http://git.kernel.org/tip/93015236d92bf9ea746c0b10c3c1d9058cb11f82
Author: John Stultz <john.stultz@xxxxxxxxxx>
AuthorDate: Fri, 6 May 2011 17:28:36 -0700
Committer: John Stultz <john.stultz@xxxxxxxxxx>
CommitDate: Fri, 6 May 2011 18:02:03 -0700
rtc: msm6242: 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@xxxxxxxxxxxxxx>
CC: Alessandro Zummo <a.zummo@xxxxxxxxxxxx>
CC: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CC: rtc-linux@xxxxxxxxxxxxxxxx
Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx>
---
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,
THIS_MODULE);
@@ -223,10 +224,10 @@ static int __init msm6242_rtc_probe(struct platform_device *dev)
}
priv->rtc = rtc;
- platform_set_drvdata(dev, priv);
return 0;
out_unmap:
+ platform_set_drvdata(dev, NULL);
iounmap(priv->regs);
out_free_priv:
kfree(priv);
--
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