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authorDavid Brownell <david-b@pacbell.net>2006-11-25 22:09:28 +0300
committerLinus Torvalds <torvalds@woody.osdl.org>2006-11-26 00:28:33 +0300
commitd728b1e69fd5829ec2ab2434381e5a268d4f684a (patch)
treee11b3dea35247074628f04f5441e4a458bdbd86b /drivers/rtc/rtc-test.c
parent2601a46474db2dcbc08ee690e56f08a10abe65cb (diff)
downloadlinux-d728b1e69fd5829ec2ab2434381e5a268d4f684a.tar.xz
[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.c2
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;
}