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| author | David Brownell <david-b@pacbell.net> | 2006-11-25 11:09:28 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-11-25 13:28:33 -0800 |
| commit | d728b1e69fd5829ec2ab2434381e5a268d4f684a (patch) | |
| tree | e11b3dea35247074628f04f5441e4a458bdbd86b /drivers/rtc/rtc-test.c | |
| parent | 2601a46474db2dcbc08ee690e56f08a10abe65cb (diff) | |
| download | linux-d728b1e69fd5829ec2ab2434381e5a268d4f684a.tar.gz linux-d728b1e69fd5829ec2ab2434381e5a268d4f684a.tar.bz2 linux-d728b1e69fd5829ec2ab2434381e5a268d4f684a.zip | |
[PATCH] rtc class locking bugfixes
I got a lockdep warning when running "rtctest" so I though it'd be good
to see what was up.
- The warning was for rtc->irq_task_lock, gotten from rtc_update_irq()
by irq handlerss ... but in a handful of other cases, grabbed without
blocking IRQs.
- Some callers to rtc_update_irq() were not ensuring IRQs were blocked,
yet the routine expects that; make sure all callers block IRQs.
It would appear that RTC API tests haven't been part of anyone's kernel
regression test suite recently, at least not with lockdep running.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/rtc/rtc-test.c')
| -rw-r--r-- | drivers/rtc/rtc-test.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-test.c b/drivers/rtc/rtc-test.c index bc4bd24508a2..6ef9c62d5032 100644 --- a/drivers/rtc/rtc-test.c +++ b/drivers/rtc/rtc-test.c @@ -99,6 +99,7 @@ static ssize_t test_irq_store(struct device *dev, struct rtc_device *rtc = platform_get_drvdata(plat_dev); retval = count; + local_irq_disable(); if (strncmp(buf, "tick", 4) == 0) rtc_update_irq(&rtc->class_dev, 1, RTC_PF | RTC_IRQF); else if (strncmp(buf, "alarm", 5) == 0) @@ -107,6 +108,7 @@ static ssize_t test_irq_store(struct device *dev, rtc_update_irq(&rtc->class_dev, 1, RTC_UF | RTC_IRQF); else retval = -EINVAL; + local_irq_enable(); return retval; } |