[PATCH] fix next_timer_interrupt() for hrtimer

[safe/jmp/linux-2.6] / arch / arm / kernel / time.c

diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index d7d932c..d6bd435 100644 (file)
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -422,12 +422,14 @@ static int timer_dyn_tick_disable(void)
 void timer_dyn_reprogram(void)
 {
        struct dyn_tick_timer *dyn_tick = system_timer->dyn_tick;
+       unsigned long next, seq;
 
-       if (dyn_tick) {
-               write_seqlock(&xtime_lock);
-               if (dyn_tick->state & DYN_TICK_ENABLED)
+       if (dyn_tick && (dyn_tick->state & DYN_TICK_ENABLED)) {
+               next = next_timer_interrupt();
+               do {
+                       seq = read_seqbegin(&xtime_lock);
                        dyn_tick->reprogram(next_timer_interrupt() - jiffies);
-               write_sequnlock(&xtime_lock);
+               } while (read_seqretry(&xtime_lock, seq));
        }
 }