From 157e8bf8b4823bfcdefa6c1548002374b61f61df Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 3 Jan 2012 17:32:13 -0800 Subject: Revert "rtc: Disable the alarm in the hardware" This reverts commit c0afabd3d553c521e003779c127143ffde55a16f. It causes failures on Toshiba laptops - instead of disabling the alarm, it actually seems to enable it on the affected laptops, resulting in (for example) the laptop powering on automatically five minutes after shutdown. There's a patch for it that appears to work for at least some people, but it's too late to play around with this, so revert for now and try again in the next merge window. See for example http://bugs.debian.org/652869 Reported-and-bisected-by: Andreas Friedrich (Toshiba Tecra) Reported-by: Antonio-M. Corbi Bellot (Toshiba Portege R500) Reported-by: Marco Santos (Toshiba Portege Z830) Reported-by: Christophe Vu-Brugier (Toshiba Portege R830) Cc: Jonathan Nieder Requested-by: John Stultz Cc: stable@kernel.org # for the versions that applied this Signed-off-by: Linus Torvalds --- drivers/rtc/interface.c | 44 ++++++++++---------------------------------- 1 file changed, 10 insertions(+), 34 deletions(-) (limited to 'drivers/rtc/interface.c') diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c index 3bcc7cfcaba..ed35a6b4753 100644 --- a/drivers/rtc/interface.c +++ b/drivers/rtc/interface.c @@ -323,20 +323,6 @@ int rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) } EXPORT_SYMBOL_GPL(rtc_read_alarm); -static int ___rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) -{ - int err; - - if (!rtc->ops) - err = -ENODEV; - else if (!rtc->ops->set_alarm) - err = -EINVAL; - else - err = rtc->ops->set_alarm(rtc->dev.parent, alarm); - - return err; -} - static int __rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) { struct rtc_time tm; @@ -360,7 +346,14 @@ static int __rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) * over right here, before we set the alarm. */ - return ___rtc_set_alarm(rtc, alarm); + if (!rtc->ops) + err = -ENODEV; + else if (!rtc->ops->set_alarm) + err = -EINVAL; + else + err = rtc->ops->set_alarm(rtc->dev.parent, alarm); + + return err; } int rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) @@ -776,20 +769,6 @@ static int rtc_timer_enqueue(struct rtc_device *rtc, struct rtc_timer *timer) return 0; } -static void rtc_alarm_disable(struct rtc_device *rtc) -{ - struct rtc_wkalrm alarm; - struct rtc_time tm; - - __rtc_read_time(rtc, &tm); - - alarm.time = rtc_ktime_to_tm(ktime_add(rtc_tm_to_ktime(tm), - ktime_set(300, 0))); - alarm.enabled = 0; - - ___rtc_set_alarm(rtc, &alarm); -} - /** * rtc_timer_remove - Removes a rtc_timer from the rtc_device timerqueue * @rtc rtc device @@ -811,10 +790,8 @@ static void rtc_timer_remove(struct rtc_device *rtc, struct rtc_timer *timer) struct rtc_wkalrm alarm; int err; next = timerqueue_getnext(&rtc->timerqueue); - if (!next) { - rtc_alarm_disable(rtc); + if (!next) return; - } alarm.time = rtc_ktime_to_tm(next->expires); alarm.enabled = 1; err = __rtc_set_alarm(rtc, &alarm); @@ -876,8 +853,7 @@ again: err = __rtc_set_alarm(rtc, &alarm); if (err == -ETIME) goto again; - } else - rtc_alarm_disable(rtc); + } mutex_unlock(&rtc->ops_lock); } -- cgit v1.2.3-70-g09d2 From f423fc627b05f47bc9305f9661630fce30f208f9 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Wed, 4 Jan 2012 07:57:22 -0800 Subject: Revert "rtc: Expire alarms after the time is set." This reverts commit 93b2ec0128c431148b216b8f7337c1a52131ef03. The call to "schedule_work()" in rtc_initialize_alarm() happens too early, and can cause oopses at bootup Neil Brown explains why we do it: "If you set an alarm in the future, then shutdown and boot again after that time, then you will end up with a timer_queue node which is in the past. When this happens the queue gets stuck. That entry-in-the-past won't get removed until and interrupt happens and an interrupt won't happen because the RTC only triggers an interrupt when the alarm is "now". So you'll find that e.g. "hwclock" will always tell you that 'select' timed out. So we force the interrupt work to happen at the start just in case." and has a patch that convert it to do things in-process rather than with the worker thread, but right now it's too late to play around with this, so we just revert the patch that caused problems for now. Reported-by: Sander Eikelenboom Requested-by: Konrad Rzeszutek Wilk Requested-by: John Stultz Cc: Neil Brown Signed-off-by: Linus Torvalds --- drivers/rtc/interface.c | 6 ------ 1 file changed, 6 deletions(-) (limited to 'drivers/rtc/interface.c') diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c index ed35a6b4753..8e286259a00 100644 --- a/drivers/rtc/interface.c +++ b/drivers/rtc/interface.c @@ -73,8 +73,6 @@ int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm) err = -EINVAL; mutex_unlock(&rtc->ops_lock); - /* A timer might have just expired */ - schedule_work(&rtc->irqwork); return err; } EXPORT_SYMBOL_GPL(rtc_set_time); @@ -114,8 +112,6 @@ int rtc_set_mmss(struct rtc_device *rtc, unsigned long secs) err = -EINVAL; mutex_unlock(&rtc->ops_lock); - /* A timer might have just expired */ - schedule_work(&rtc->irqwork); return err; } @@ -400,8 +396,6 @@ int rtc_initialize_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm) timerqueue_add(&rtc->timerqueue, &rtc->aie_timer.node); } mutex_unlock(&rtc->ops_lock); - /* maybe that was in the past.*/ - schedule_work(&rtc->irqwork); return err; } EXPORT_SYMBOL_GPL(rtc_initialize_alarm); -- cgit v1.2.3-70-g09d2