Commit-ID: 5f54c8a00af20e5cf38c3e5ef2f59b6848a17cd9
Gitweb: http://git.kernel.org/tip/5f54c8a00af20e5cf38c3e5ef2f59b6848a17cd9
Author: Wolfram Sang <w.sang@xxxxxxxxxxxxxx>
AuthorDate: Wed, 4 May 2011 17:31:27 +0200
Committer: John Stultz <john.stultz@xxxxxxxxxx>
CommitDate: Fri, 6 May 2011 17:40:10 -0700
rtc: mxc: 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: Alessandro Zummo <a.zummo@xxxxxxxxxxxx>
CC: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CC: rtc-linux@xxxxxxxxxxxxxxxx
Signed-off-by: Wolfram Sang <w.sang@xxxxxxxxxxxxxx>
[fixed up commit log -jstultz]
Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx>
---
drivers/rtc/rtc-mxc.c | 19 +++++++++++--------
1 files changed, 11 insertions(+), 8 deletions(-)
diff --git a/drivers/rtc/rtc-mxc.c b/drivers/rtc/rtc-mxc.c
index 826ab64..d814417 100644
--- a/drivers/rtc/rtc-mxc.c
+++ b/drivers/rtc/rtc-mxc.c
@@ -418,14 +418,6 @@ static int __init mxc_rtc_probe(struct platform_device *pdev)
goto exit_put_clk;
}
- rtc = rtc_device_register(pdev->name, &pdev->dev, &mxc_rtc_ops,
- THIS_MODULE);
- if (IS_ERR(rtc)) {
- ret = PTR_ERR(rtc);
- goto exit_put_clk;
- }
-
- pdata->rtc = rtc;
platform_set_drvdata(pdev, pdata);
/* Configure and enable the RTC */
@@ -438,8 +430,19 @@ static int __init mxc_rtc_probe(struct platform_device *pdev)
pdata->irq = -1;
}
+ rtc = rtc_device_register(pdev->name, &pdev->dev, &mxc_rtc_ops,
+ THIS_MODULE);
+ if (IS_ERR(rtc)) {
+ ret = PTR_ERR(rtc);
+ goto exit_clr_drvdata;
+ }
+
+ pdata->rtc = rtc;
+
return 0;
+exit_clr_drvdata:
+ platform_set_drvdata(pdev, NULL);
exit_put_clk:
clk_disable(pdata->clk);
clk_put(pdata->clk);
--
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