[MIPS] time: Use non-interrupt locks in GT641xx clockevent driver

set_next_event() and set_mode() are always called with interrupt disabled.
irqsave and irqrestore are not necessary for spinlock.
Pointed out by Atsushi Nemoto.
Signed-off-by: NYoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/kernel/cevt-gt641xx.c

@@ -49,10 +49,9 @@ int gt641xx_timer0_state(void)
 static int gt641xx_timer0_set_next_event(unsigned long delta,
 					 struct clock_event_device *evt)
 {
-	unsigned long flags;
 	u32 ctrl;
 
-	spin_lock_irqsave(&gt641xx_timer_lock, flags);
+	spin_lock(&gt641xx_timer_lock);
 
 	ctrl = GT_READ(GT_TC_CONTROL_OFS);
 	ctrl &= ~(GT_TC_CONTROL_ENTC0_MSK | GT_TC_CONTROL_SELTC0_MSK);
@@ -61,7 +60,7 @@ static int gt641xx_timer0_set_next_event(unsigned long delta,
 	GT_WRITE(GT_TC0_OFS, delta);
 	GT_WRITE(GT_TC_CONTROL_OFS, ctrl);
 
-	spin_unlock_irqrestore(&gt641xx_timer_lock, flags);
+	spin_unlock(&gt641xx_timer_lock);
 
 	return 0;
 }
@@ -69,10 +68,9 @@ static int gt641xx_timer0_set_next_event(unsigned long delta,
 static void gt641xx_timer0_set_mode(enum clock_event_mode mode,
 				    struct clock_event_device *evt)
 {
-	unsigned long flags;
 	u32 ctrl;
 
-	spin_lock_irqsave(&gt641xx_timer_lock, flags);
+	spin_lock(&gt641xx_timer_lock);
 
 	ctrl = GT_READ(GT_TC_CONTROL_OFS);
 	ctrl &= ~(GT_TC_CONTROL_ENTC0_MSK | GT_TC_CONTROL_SELTC0_MSK);
@@ -90,7 +88,7 @@ static void gt641xx_timer0_set_mode(enum clock_event_mode mode,
 
 	GT_WRITE(GT_TC_CONTROL_OFS, ctrl);
 
-	spin_unlock_irqrestore(&gt641xx_timer_lock, flags);
+	spin_unlock(&gt641xx_timer_lock);
 }
 
 static void gt641xx_timer0_event_handler(struct clock_event_device *dev)