[ARM] 3554/1: ARM: Fix dyntick locking

Patch from Tony Lindgren

This patch fixes some dyntick locking issues on ARM as pointed
out by Russell King.

Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
index 2d5896b36181..bcc19fbb32df 100644
--- a/arch/arm/kernel/irq.c
+++ b/arch/arm/kernel/irq.c
@@ -342,10 +342,10 @@ __do_irq(unsigned int irq, struct irqaction *action, struct pt_regs *regs)
 
 #ifdef CONFIG_NO_IDLE_HZ
         if (!(action->flags & SA_TIMER) && system_timer->dyn_tick != NULL) {
-                write_seqlock(&xtime_lock);
+                spin_lock(&system_timer->dyn_tick->lock);
                 if (system_timer->dyn_tick->state & DYN_TICK_ENABLED)
                         system_timer->dyn_tick->handler(irq, 0, regs);
-                write_sequnlock(&xtime_lock);
+                spin_unlock(&system_timer->dyn_tick->lock);
         }
 #endif