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[S390] stp synchronization retry timer

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Add a timer that retries the clock synchronization via the server time
protocol if there is a usable clock but the synchronization failed.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2009-04-14 15:36:19 +02:00
parent 81f64b8773
commit 0436230148
1 changed files with 15 additions and 0 deletions
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15
arch/s390/kernel/time.c
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@ -1423,6 +1423,7 @@ static void *stp_page;
static void stp_work_fn(struct work_struct *work);
static DEFINE_MUTEX(stp_work_mutex);
static DECLARE_WORK(stp_work, stp_work_fn);
static struct timer_list stp_timer;
static int __init early_parse_stp(char *p)
{
@ -1454,10 +1455,16 @@ static void __init stp_reset(void)
}
}
static void stp_timeout(unsigned long dummy)
{
queue_work(time_sync_wq, &stp_work);
}
static int __init stp_init(void)
{
if (!test_bit(CLOCK_SYNC_HAS_STP, &clock_sync_flags))
return 0;
setup_timer(&stp_timer, stp_timeout, 0UL);
time_init_wq();
if (!stp_online)
return 0;
@ -1565,6 +1572,7 @@ static void stp_work_fn(struct work_struct *work)
if (!stp_online) {
chsc_sstpc(stp_page, STP_OP_CTRL, 0x0000);
del_timer_sync(&stp_timer);
goto out_unlock;
}
@ -1586,6 +1594,13 @@ static void stp_work_fn(struct work_struct *work)
stop_machine(stp_sync_clock, &stp_sync, &cpu_online_map);
put_online_cpus();
if (!check_sync_clock())
/*
* There is a usable clock but the synchonization failed.
* Retry after a second.
*/
mod_timer(&stp_timer, jiffies + HZ);
out_unlock:
mutex_unlock(&stp_work_mutex);
}