Commit 04362301 authored by Martin Schwidefsky's avatar Martin Schwidefsky
Browse files

[S390] stp synchronization retry timer 



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: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 81f64b87

arch/s390/kernel/time.c

+15 −0
Original line number Diff line number Diff line
@@ -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);

}