commit baea22407db46e99c22c7b04bf7413880cd111d3
author Pawel Dunaj <pawel.dunaj@nordicsemi.no> Thu Nov 22 11:49:32 2018 +0100
committer Carles Cufí <carles.cufi@nordicsemi.no> Mon Nov 26 12:24:59 2018 +0100
tree 87624e9aa9950937d0b6e9ee319d316d7a85e08a
parent 38efc2d4264d85916349a3794709fbfe4d90fa17

kernel: Always set clock expiry with sync with timeout module

System must not set the clock expiry via backdoor as it may
effect in unbound time drift of all scheduled timeouts.

Fixes: #11502

Signed-off-by: Pawel Dunaj <pawel.dunaj@nordicsemi.no>

kernel/timeout.c

diff --git a/kernel/timeout.c b/kernel/timeout.c
index f97076b..4ffae50 100644
--- a/kernel/timeout.c
+++ b/kernel/timeout.c
@@ -85,7 +85,9 @@
 			sys_dlist_append(&timeout_list, &to->node);
 		}
 
-		z_clock_set_timeout(_get_next_timeout_expiry(), false);
+		if (to == first()) {
+			z_clock_set_timeout(_get_next_timeout_expiry(), false);
+		}
 	}
 }
 
@@ -182,6 +184,17 @@
 	return ret;
 }
 
+void z_set_timeout_expiry(s32_t ticks, bool idle)
+{
+	LOCKED(&timeout_lock) {
+		int next = _get_next_timeout_expiry();
+
+		if ((next == K_FOREVER) || (ticks < next)) {
+			z_clock_set_timeout(ticks, idle);
+		}
+	}
+}
+
 int k_enable_sys_clock_always_on(void)
 {
 	int ret = !can_wait_forever;