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-rw-r--r--kernel/time/clocksource.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index db0c725de5e..3db5c3c460d 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -74,6 +74,8 @@ static struct clocksource *watchdog;
static struct timer_list watchdog_timer;
static DEFINE_SPINLOCK(watchdog_lock);
static cycle_t watchdog_last;
+static int watchdog_resumed;
+
/*
* Interval: 0.5sec Threshold: 0.0625s
*/
@@ -98,15 +100,26 @@ static void clocksource_watchdog(unsigned long data)
struct clocksource *cs, *tmp;
cycle_t csnow, wdnow;
int64_t wd_nsec, cs_nsec;
+ int resumed;
spin_lock(&watchdog_lock);
+ resumed = watchdog_resumed;
+ if (unlikely(resumed))
+ watchdog_resumed = 0;
+
wdnow = watchdog->read();
wd_nsec = cyc2ns(watchdog, (wdnow - watchdog_last) & watchdog->mask);
watchdog_last = wdnow;
list_for_each_entry_safe(cs, tmp, &watchdog_list, wd_list) {
csnow = cs->read();
+
+ if (unlikely(resumed)) {
+ cs->wd_last = csnow;
+ continue;
+ }
+
/* Initialized ? */
if (!(cs->flags & CLOCK_SOURCE_WATCHDOG)) {
if ((cs->flags & CLOCK_SOURCE_IS_CONTINUOUS) &&
@@ -136,6 +149,13 @@ static void clocksource_watchdog(unsigned long data)
}
spin_unlock(&watchdog_lock);
}
+static void clocksource_resume_watchdog(void)
+{
+ spin_lock(&watchdog_lock);
+ watchdog_resumed = 1;
+ spin_unlock(&watchdog_lock);
+}
+
static void clocksource_check_watchdog(struct clocksource *cs)
{
struct clocksource *cse;
@@ -182,9 +202,34 @@ static void clocksource_check_watchdog(struct clocksource *cs)
if (cs->flags & CLOCK_SOURCE_IS_CONTINUOUS)
cs->flags |= CLOCK_SOURCE_VALID_FOR_HRES;
}
+
+static inline void clocksource_resume_watchdog(void) { }
#endif
/**
+ * clocksource_resume - resume the clocksource(s)
+ */
+void clocksource_resume(void)
+{
+ struct list_head *tmp;
+ unsigned long flags;
+
+ spin_lock_irqsave(&clocksource_lock, flags);
+
+ list_for_each(tmp, &clocksource_list) {
+ struct clocksource *cs;
+
+ cs = list_entry(tmp, struct clocksource, list);
+ if (cs->resume)
+ cs->resume();
+ }
+
+ clocksource_resume_watchdog();
+
+ spin_unlock_irqrestore(&clocksource_lock, flags);
+}
+
+/**
* clocksource_get_next - Returns the selected clocksource
*
*/