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| author | Thomas Gleixner <tglx@linutronix.de> | 2007-03-17 00:25:52 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-03-16 19:35:25 -0700 |
| commit | cd05a1f818073a623455a58e756c5b419fc98db9 (patch) | |
| tree | 4e148e96f00fe07b0c53a379e812344733e8484a /kernel/time/tick-oneshot.c | |
| parent | 24c4ac070adffe4a21f3a8daf4aee7c98fa6c4f9 (diff) | |
| download | linux-cd05a1f818073a623455a58e756c5b419fc98db9.tar.gz linux-cd05a1f818073a623455a58e756c5b419fc98db9.tar.bz2 linux-cd05a1f818073a623455a58e756c5b419fc98db9.zip | |
[PATCH] clockevents: Fix suspend/resume to disk hangs
I finally found a dual core box, which survives suspend/resume without
crashing in the middle of nowhere. Sigh, I never figured out from the
code and the bug reports what's going on.
The observed hangs are caused by a stale state transition of the clock
event devices, which keeps the RCU synchronization away from completion,
when the non boot CPU is brought back up.
The suspend/resume in oneshot mode needs the similar care as the
periodic mode during suspend to RAM. My assumption that the state
transitions during the different shutdown/bringups of s2disk would go
through the periodic boot phase and then switch over to highres resp.
nohz mode were simply wrong.
Add the appropriate suspend / resume handling for the non periodic
modes.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/time/tick-oneshot.c')
| -rw-r--r-- | kernel/time/tick-oneshot.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/kernel/time/tick-oneshot.c b/kernel/time/tick-oneshot.c index 2e8b7ff863cc..f6997ab0c3c9 100644 --- a/kernel/time/tick-oneshot.c +++ b/kernel/time/tick-oneshot.c @@ -41,6 +41,18 @@ int tick_program_event(ktime_t expires, int force) } /** + * tick_resume_onshot - resume oneshot mode + */ +void tick_resume_oneshot(void) +{ + struct tick_device *td = &__get_cpu_var(tick_cpu_device); + struct clock_event_device *dev = td->evtdev; + + clockevents_set_mode(dev, CLOCK_EVT_MODE_ONESHOT); + tick_program_event(ktime_get(), 1); +} + +/** * tick_setup_oneshot - setup the event device for oneshot mode (hres or nohz) */ void tick_setup_oneshot(struct clock_event_device *newdev, |