rtc: make rtc_update_irq callable with irqs enabled

The rtc_update_irq() might be called with irqs enabled, if a interrupt
handler was registered without IRQF_DISABLED.  Use
spin_lock_irqsave/spin_unlock_irqrestore instead of spin_lock/spin_unlock.

Also update kerneldoc and drivers which do extra work to follow the
current interface spec, as suggestted by David Brownell.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 0 insertions, 3 deletions

diff --git a/drivers/rtc/rtc-ds1305.c b/drivers/rtc/rtc-ds1305.c
index fc372df6534b..8f410e59d9f5 100644
--- a/drivers/rtc/rtc-ds1305.c
+++ b/drivers/rtc/rtc-ds1305.c
@@ -499,10 +499,7 @@ static void ds1305_work(struct work_struct *work)
         if (!test_bit(FLAG_EXITING, &ds1305->flags))
                 enable_irq(spi->irq);
 
-        /* rtc_update_irq() requires an IRQ-disabled context */
-        local_irq_disable();
         rtc_update_irq(ds1305->rtc, 1, RTC_AF | RTC_IRQF);
-        local_irq_enable();
 }
 
 /*