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| author | Magnus Damm <damm@opensource.se> | 2010-02-02 14:41:41 -0800 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2010-02-05 14:54:10 +0100 |
| commit | c54a42b19fbaae4e9f212322ecca25a6bc95c1ba (patch) | |
| tree | 2c929d3cde3b4ae864d5f5a50bdda688fd5293eb /kernel/time | |
| parent | 17622339af2536b32cf29699ddd4ba0fe79a61d5 (diff) | |
| download | linux-c54a42b19fbaae4e9f212322ecca25a6bc95c1ba.tar.gz linux-c54a42b19fbaae4e9f212322ecca25a6bc95c1ba.tar.bz2 linux-c54a42b19fbaae4e9f212322ecca25a6bc95c1ba.zip | |
clocksource: add suspend callback
Add a clocksource suspend callback. This callback can be used by the
clocksource driver to shutdown and perform any kind of late suspend
activities even though the clocksource driver itself is a non-sysdev
driver.
One example where this is useful is to fix the sh_cmt.c platform driver
that today suspends using the platform bus and shuts down the clocksource
too early.
With this callback in place the sh_cmt driver will suspend using the
clocksource and clockevent hooks and leave the platform device pm
callbacks unused.
Signed-off-by: Magnus Damm <damm@opensource.se>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: john stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/time')
| -rw-r--r-- | kernel/time/clocksource.c | 12 | ||||
| -rw-r--r-- | kernel/time/timekeeping.c | 1 |
2 files changed, 13 insertions, 0 deletions
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c index 08adacb2a1ed..bd246660902c 100644 --- a/kernel/time/clocksource.c +++ b/kernel/time/clocksource.c @@ -441,6 +441,18 @@ static inline int clocksource_watchdog_kthread(void *data) { return 0; } #endif /* CONFIG_CLOCKSOURCE_WATCHDOG */ /** + * clocksource_suspend - suspend the clocksource(s) + */ +void clocksource_suspend(void) +{ + struct clocksource *cs; + + list_for_each_entry_reverse(cs, &clocksource_list, list) + if (cs->suspend) + cs->suspend(cs); +} + +/** * clocksource_resume - resume the clocksource(s) */ void clocksource_resume(void) diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c index 7faaa32fbf4f..843d8a711b16 100644 --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -622,6 +622,7 @@ static int timekeeping_suspend(struct sys_device *dev, pm_message_t state) write_sequnlock_irqrestore(&xtime_lock, flags); clockevents_notify(CLOCK_EVT_NOTIFY_SUSPEND, NULL); + clocksource_suspend(); return 0; } |