linux-kernel - [PATCH] update clocksource raw_time in timekeeping

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Date:	Wed, 9 Sep 2009 15:35:43 +0800
From:	ye janboe <janboe.ye@...il.com>
To:	johnstul@...ibm.com, zippel@...ux-m68k.org,
	akpm@...ux-foundation.org, mingo@...e.hu
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH] update clocksource raw_time in timekeeping_suspend

after resume from suspend, raw_time is not updated in
timekeeping_suspend. CLOCK_MONOTONIC_RAW could not get the real hw
time.
This patch fix this issue.

Signed-off-by: janboe <janboe.ye@...il.com>
---
 kernel/time/timekeeping.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index e8c77d9..8420b85 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -331,6 +331,8 @@ static unsigned long timekeeping_suspend_time;
 static int timekeeping_resume(struct sys_device *dev)
 {
        unsigned long flags;
+       s64 nsec;
+       cycle_t last_cycle, cycle_delta;
        unsigned long now = read_persistent_clock();

        clocksource_resume();
@@ -346,8 +348,12 @@ static int timekeeping_resume(struct sys_device *dev)
        }
        update_xtime_cache(0);
        /* re-base the last cycle value */
+       last_cycle = clock->cycle_last;
        clock->cycle_last = 0;
        clock->cycle_last = clocksource_read(clock);
+       cycle_delta = clock->cycle_last - last_cycle;
+       nsec = cyc2ns(clock, cycle_delta);
+       timespec_add_ns(&clock->raw_time, nsec);
        clock->error = 0;
        timekeeping_suspended = 0;
        write_sequnlock_irqrestore(&xtime_lock, flags);
--
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