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, 5 deletions

diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index 8a6f9a9f9cb8..47a93c022d91 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -267,12 +267,7 @@ static void ds1307_work(struct work_struct *work)
                 control &= ~DS1337_BIT_A1IE;
                 i2c_smbus_write_byte_data(client, DS1337_REG_CONTROL, control);
 
-                /* rtc_update_irq() assumes that it is called
-                 * from IRQ-disabled context.
-                 */
-                local_irq_disable();
                 rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF);
-                local_irq_enable();
         }
 
 out: