linux-kernel - [PATCH RFC 6/8] clock device: convert timer

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Date:	Thu, 4 Nov 2010 20:30:04 +0100
From:	Richard Cochran <richardcochran@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-api@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Christoph Lameter <cl@...ux.com>,
	John Stultz <johnstul@...ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH RFC 6/8] clock device: convert timer_delete

This patch lets the timer_delete system call use dynamic clock devices.

Signed-off-by: Richard Cochran <richard.cochran@...cron.at>
---
 include/linux/clockdevice.h |    1 +
 kernel/posix-timers.c       |    7 +++++++
 kernel/time/clockdevice.c   |   18 ++++++++++++++++++
 3 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/include/linux/clockdevice.h b/include/linux/clockdevice.h
index 3201a28..592bd5e 100644
--- a/include/linux/clockdevice.h
+++ b/include/linux/clockdevice.h
@@ -107,5 +107,6 @@ struct clock_device *clockid_to_clock_device(clockid_t id);
  * The following functions are only to be called from posix-timers.c
  */
 int clock_device_timer_create(struct clock_device *clk, struct k_itimer *kit);
+int clock_device_timer_delete(struct clock_device *clk, struct k_itimer *kit);
 
 #endif
diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index 42efbe9..5feb565 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -857,6 +857,13 @@ static inline int common_timer_del(struct k_itimer *timer)
 
 static inline int timer_delete_hook(struct k_itimer *timer)
 {
+	struct clock_device *clk_dev;
+
+	clk_dev = clockid_to_clock_device(timer->it_clock);
+
+	if (clk_dev)
+		return clock_device_timer_delete(clk_dev, timer);
+
 	return CLOCK_DISPATCH(timer->it_clock, timer_del, (timer));
 }
 
diff --git a/kernel/time/clockdevice.c b/kernel/time/clockdevice.c
index 166cc30..27d13a4 100644
--- a/kernel/time/clockdevice.c
+++ b/kernel/time/clockdevice.c
@@ -281,3 +281,21 @@ int clock_device_timer_create(struct clock_device *clk, struct k_itimer *kit)
 	mutex_unlock(&clk->mux);
 	return err;
 }
+
+int clock_device_timer_delete(struct clock_device *clk, struct k_itimer *kit)
+{
+	int err;
+
+	mutex_lock(&clk->mux);
+
+	if (clk->zombie)
+		err = -ENODEV;
+	else if (!clk->ops->timer_delete)
+		err = -EOPNOTSUPP;
+	else
+		err = clk->ops->timer_delete(clk->priv, kit);
+
+	mutex_unlock(&clk->mux);
+
+	return err;
+}
-- 
1.7.0.4

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