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, 2 deletions

diff --git a/drivers/rtc/rtc-test.c b/drivers/rtc/rtc-test.c
index e478280ff628..51725f7755b0 100644
--- a/drivers/rtc/rtc-test.c
+++ b/drivers/rtc/rtc-test.c
@@ -93,7 +93,6 @@ 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, 1, RTC_PF | RTC_IRQF);
         else if (strncmp(buf, "alarm", 5) == 0)
@@ -102,7 +101,6 @@ static ssize_t test_irq_store(struct device *dev,
                 rtc_update_irq(rtc, 1, RTC_UF | RTC_IRQF);
         else
                 retval = -EINVAL;
-        local_irq_enable();
 
         return retval;
 }