diff options
| author | Atsushi Nemoto <anemo@mba.ocn.ne.jp> | 2009-06-18 16:49:09 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-06-19 16:46:05 -0700 |
| commit | e6229bec25be4ba00f31dd26e25721cc96c22262 (patch) | |
| tree | a27e4c51dd8b9aaeb589a147a22bbd06bde77cf0 /drivers/rtc/interface.c | |
| parent | 575c5807f6842422e9fe2432fd48dfcc1d7aef41 (diff) | |
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>
Diffstat (limited to 'drivers/rtc/interface.c')
| -rw-r--r-- | drivers/rtc/interface.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c index 4348c4b0d45..4cdb31a362c 100644 --- a/drivers/rtc/interface.c +++ b/drivers/rtc/interface.c @@ -371,19 +371,21 @@ EXPORT_SYMBOL_GPL(rtc_update_irq_enable); * @rtc: the rtc device * @num: how many irqs are being reported (usually one) * @events: mask of RTC_IRQF with one or more of RTC_PF, RTC_AF, RTC_UF - * Context: in_interrupt(), irqs blocked + * Context: any */ void rtc_update_irq(struct rtc_device *rtc, unsigned long num, unsigned long events) { - spin_lock(&rtc->irq_lock); + unsigned long flags; + + spin_lock_irqsave(&rtc->irq_lock, flags); rtc->irq_data = (rtc->irq_data + (num << 8)) | events; - spin_unlock(&rtc->irq_lock); + spin_unlock_irqrestore(&rtc->irq_lock, flags); - spin_lock(&rtc->irq_task_lock); + spin_lock_irqsave(&rtc->irq_task_lock, flags); if (rtc->irq_task) rtc->irq_task->func(rtc->irq_task->private_data); - spin_unlock(&rtc->irq_task_lock); + spin_unlock_irqrestore(&rtc->irq_task_lock, flags); wake_up_interruptible(&rtc->irq_queue); kill_fasync(&rtc->async_queue, SIGIO, POLL_IN); |