| Date | Thu, 01 Jul 2010 10:31:30 -0700 | From | Greg KH <> | Subject | [patch 064/149] rtc-cmos: do dev_set_drvdata() earlier in the initialization |
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2.6.32-stable review patch. If anyone has any objections, please let us know.
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From: Dan Carpenter <error27@gmail.com>
commit 6ba8bcd457d9fc793ac9435aa2e4138f571d4ec5 upstream.
The bug is an oops when dev_get_drvdata() returned null in cmos_update_irq_enable(). The call tree looks like this: rtc_dev_ioctl() => rtc_update_irq_enable() => cmos_update_irq_enable()
It's caused by a race condition in the module initialization. It is rtc_device_register() which makes the ioctl operations live so I moved the call to dev_set_drvdata() before the call to rtc_device_register().
Addresses https://bugzilla.kernel.org/show_bug.cgi?id=15963
Reported-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Dan Carpenter <error27@gmail.com> Tested-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Paul Gortmaker <p_gortmaker@yahoo.com> Cc: Malte Schroder <maltesch@gmx.de> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Herton Ronaldo Krzesinski <herton@mandriva.com.br> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- drivers/rtc/rtc-cmos.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/rtc/rtc-cmos.c +++ b/drivers/rtc/rtc-cmos.c @@ -723,6 +723,9 @@ cmos_do_probe(struct device *dev, struct } } + cmos_rtc.dev = dev; + dev_set_drvdata(dev, &cmos_rtc); + cmos_rtc.rtc = rtc_device_register(driver_name, dev, &cmos_rtc_ops, THIS_MODULE); if (IS_ERR(cmos_rtc.rtc)) { @@ -730,8 +733,6 @@ cmos_do_probe(struct device *dev, struct goto cleanup0; } - cmos_rtc.dev = dev; - dev_set_drvdata(dev, &cmos_rtc); rename_region(ports, dev_name(&cmos_rtc.rtc->dev)); spin_lock_irq(&rtc_lock);
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