diff options
| author | John Stultz <john.stultz@linaro.org> | 2011-05-07 04:30:57 +0400 |
|---|---|---|
| committer | John Stultz <john.stultz@linaro.org> | 2011-05-07 05:02:04 +0400 |
| commit | 4b3687f9c18156cdb71729fe4e0c3000f7e4d7de (patch) | |
| tree | d874e58a7cf4bc488707f956d0160b2eaab57b86 /drivers/rtc | |
| parent | 93015236d92bf9ea746c0b10c3c1d9058cb11f82 (diff) | |
| download | linux-4b3687f9c18156cdb71729fe4e0c3000f7e4d7de.tar.xz | |
rtc: pcap: 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-pcap.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/rtc/rtc-pcap.c b/drivers/rtc/rtc-pcap.c index a633abc42896..cd4f198cc2ef 100644 --- a/drivers/rtc/rtc-pcap.c +++ b/drivers/rtc/rtc-pcap.c @@ -151,6 +151,8 @@ static int __devinit pcap_rtc_probe(struct platform_device *pdev) pcap_rtc->pcap = dev_get_drvdata(pdev->dev.parent); + platform_set_drvdata(pdev, pcap_rtc); + pcap_rtc->rtc = rtc_device_register("pcap", &pdev->dev, &pcap_rtc_ops, THIS_MODULE); if (IS_ERR(pcap_rtc->rtc)) { @@ -158,7 +160,6 @@ static int __devinit pcap_rtc_probe(struct platform_device *pdev) goto fail_rtc; } - platform_set_drvdata(pdev, pcap_rtc); timer_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_1HZ); alarm_irq = pcap_to_irq(pcap_rtc->pcap, PCAP_IRQ_TODA); @@ -177,6 +178,7 @@ fail_alarm: fail_timer: rtc_device_unregister(pcap_rtc->rtc); fail_rtc: + platform_set_drvdata(pdev, NULL); kfree(pcap_rtc); return err; } |