From d728b1e69fd5829ec2ab2434381e5a268d4f684a Mon Sep 17 00:00:00 2001 From: David Brownell Date: Sat, 25 Nov 2006 11:09:28 -0800 Subject: [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 Acked-by: Alessandro Zummo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/rtc/rtc-test.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers/rtc/rtc-test.c') 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; } -- cgit v1.2.3