linux-kernel - [RFC PATCH 08/10] clocksource/drivers/h8300_timer8: Remove irq and lock legacy code

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Message-Id: <1447022199-4648-8-git-send-email-daniel.lezcano@linaro.org>
Date:	Sun,  8 Nov 2015 23:36:37 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	daniel.lezcano@...aro.org, ysato@...rs.sourceforge.jp
Cc:	tglx@...utronix.de, linux-kernel@...r.kernel.org,
	uclinux-h8-devel@...ts.sourceforge.jp (moderated list:H8/300
	ARCHITECTURE)
Subject: [RFC PATCH 08/10] clocksource/drivers/h8300_timer8: Remove irq and lock legacy code

The time framawork takes care of disabling the interrupts and takes a lock
to prevent races.

Remove the legacy code in the driver taking care of the races.

Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 drivers/clocksource/h8300_timer8.c | 16 ----------------
 1 file changed, 16 deletions(-)

diff --git a/drivers/clocksource/h8300_timer8.c b/drivers/clocksource/h8300_timer8.c
index ba219cf..0885014 100644
--- a/drivers/clocksource/h8300_timer8.c
+++ b/drivers/clocksource/h8300_timer8.c
@@ -31,7 +31,6 @@
 struct timer8_priv {
 	struct clock_event_device ced;
 	unsigned long mapbase;
-	raw_spinlock_t lock;
 	unsigned long flags;
 	unsigned int rate;
 	unsigned int tcora;
@@ -78,10 +77,8 @@ static irqreturn_t timer8_interrupt(int irq, void *dev_id)
 
 static void timer8_set_next(struct timer8_priv *p, unsigned long delta)
 {
-	unsigned long flags;
 	unsigned long now;
 
-	raw_spin_lock_irqsave(&p->lock, flags);
 	if (delta >= 0x10000)
 		dev_warn(&p->pdev->dev, "delta out of range\n");
 	now = timer8_get_counter(p);
@@ -91,8 +88,6 @@ static void timer8_set_next(struct timer8_priv *p, unsigned long delta)
 		ctrl_outw(delta, p->mapbase + TCORA);
 	else
 		ctrl_outw(now + 1, p->mapbase + TCORA);
-
-	raw_spin_unlock_irqrestore(&p->lock, flags);
 }
 
 static int timer8_enable(struct timer8_priv *p)
@@ -108,9 +103,6 @@ static int timer8_enable(struct timer8_priv *p)
 static int timer8_start(struct timer8_priv *p)
 {
 	int ret = 0;
-	unsigned long flags;
-
-	raw_spin_lock_irqsave(&p->lock, flags);
 
 	if (!(p->flags & FLAG_STARTED))
 		ret = timer8_enable(p);
@@ -120,20 +112,12 @@ static int timer8_start(struct timer8_priv *p)
 	p->flags |= FLAG_STARTED;
 
  out:
-	raw_spin_unlock_irqrestore(&p->lock, flags);
-
 	return ret;
 }
 
 static void timer8_stop(struct timer8_priv *p)
 {
-	unsigned long flags;
-
-	raw_spin_lock_irqsave(&p->lock, flags);
-
 	ctrl_outw(0x0000, p->mapbase + _8TCR);
-
-	raw_spin_unlock_irqrestore(&p->lock, flags);
 }
 
 static inline struct timer8_priv *ced_to_priv(struct clock_event_device *ced)
-- 
1.9.1

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