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rtc-cmos: do dev_set_drvdata() earlier in the initialization

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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 <[email protected]>
Signed-off-by: Dan Carpenter <[email protected]>
Tested-by: Randy Dunlap <[email protected]>
Cc: Alessandro Zummo <[email protected]>
Cc: Paul Gortmaker <[email protected]>
Cc: Malte Schroder <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: Herton Ronaldo Krzesinski <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Dan Carpenter 2010-05-24 14:33:49 -07:00 • committed by Linus Torvalds
commit 6ba8bcd457
1 changed files with 3 additions and 2 deletions
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5
drivers/rtc/rtc-cmos.c
View file

@ -719,6 +719,9 @@ cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq)
}
}
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)) {
@ -726,8 +729,6 @@ cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq)
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);