linux-kernel - [PATCH] rtc: Make rtc_update_irq callable with irqs enabled

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Message-Id: <1239036633-10032-1-git-send-email-anemo@mba.ocn.ne.jp>
Date:	Tue,  7 Apr 2009 01:50:31 +0900
From:	Atsushi Nemoto <anemo@....ocn.ne.jp>
To:	Alessandro Zummo <a.zummo@...ertech.it>
Cc:	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org
Subject: [PATCH] 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.

Signed-off-by: Atsushi Nemoto <anemo@....ocn.ne.jp>
---
 drivers/rtc/interface.c |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index 4348c4b..a8641f7 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -376,14 +376,16 @@ EXPORT_SYMBOL_GPL(rtc_update_irq_enable);
 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);
-- 
1.5.6.3

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