A clock that cannot be adjusted has no servo. Check if a servo is
present before updating the clock.
Signed-off-by: Miroslav Lichvar <mlich...@redhat.com>
---
phc2sys.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/phc2sys.c b/phc2sys.c
index b8f1ea0..a476e63 100644
--- a/phc2sys.c
+++ b/phc2sys.c
@@ -782,6 +782,11 @@ static int do_loop(struct node *node, int subscriptions)
!strcmp(clock->device, node->master->device))
continue;
+ if (!clock->servo) {
+ pr_err("cannot update clock without servo");
+ return -1;
+ }
+
if (clock->clkid == CLOCK_REALTIME &&
node->master->sysoff_method >= 0) {
/* use sysoff */
--
2.17.2
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