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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2009-04-14 15:36:19 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-04-14 15:37:23 +0200
commit0436230148c55e3afbe5c57775a1fb44ba4834ac (patch)
tree0896a3ca885bcd3c59f22ed9f37c8eb01dbca906
parent81f64b87731aa33eef6b88af9d92c3398d48cf41 (diff)
[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: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r--arch/s390/kernel/time.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/s390/kernel/time.c b/arch/s390/kernel/time.c
index f72d41068dc..05f93e77870 100644
--- a/arch/s390/kernel/time.c
+++ b/arch/s390/kernel/time.c
@@ -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);
}