diff options
| author | Wolfram Sang <w.sang@pengutronix.de> | 2011-05-04 17:31:27 +0200 |
|---|---|---|
| committer | John Stultz <john.stultz@linaro.org> | 2011-05-06 17:40:10 -0700 |
| commit | 5f54c8a00af20e5cf38c3e5ef2f59b6848a17cd9 (patch) | |
| tree | 3fd5d20a1581314cfefe788bc5e9e74d57e1be3b /drivers/rtc | |
| parent | 5895198c56d131cc696556a45f7ff0ea99ac297b (diff) | |
| download | linux-5f54c8a00af20e5cf38c3e5ef2f59b6848a17cd9.tar.bz2 | |
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@towertech.it>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: rtc-linux@googlegroups.com
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
[fixed up commit log -jstultz]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'drivers/rtc')
| -rw-r--r-- | 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 826ab64a8fa9..d814417bee8c 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); |