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From: Sascha Hauer <s.hauer@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH 2/4] clock: make get_time_ns() safe to be called without clocksource
Date: Tue, 30 Sep 2014 16:22:04 +0200	[thread overview]
Message-ID: <1412086926-27167-3-git-send-email-s.hauer@pengutronix.de> (raw)
In-Reply-To: <1412086926-27167-1-git-send-email-s.hauer@pengutronix.de>

make it possible to call get_time_ns() before the clocksource
has been registered. Just return 0 in this case which is still
better than crashing the system.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 common/clock.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/common/clock.c b/common/clock.c
index 2dae9ff..76ce881 100644
--- a/common/clock.c
+++ b/common/clock.c
@@ -44,6 +44,9 @@ uint64_t get_time_ns(void)
         uint64_t cycle_now, cycle_delta;
         uint64_t ns_offset;
 
+	if (!cs)
+		return 0;
+
         /* read clocksource: */
 	cycle_now = cs->read() & cs->mask;
 
-- 
2.1.0


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  parent reply	other threads:[~2014-09-30 14:27 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-30 14:22 dmesg Support Sascha Hauer
2014-09-30 14:22 ` [PATCH 1/4] clock: Add a variable with the first timestamp after startup Sascha Hauer
2014-09-30 14:22 ` Sascha Hauer [this message]
2014-09-30 14:22 ` [PATCH 3/4] startup: Don't print multiple lines with pr_info Sascha Hauer
2014-09-30 14:22 ` [PATCH 4/4] Introduce message logging support Sascha Hauer

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