Messages in this thread Patch in this message | | | From | Julius Werner <> | Subject | [PATCH] PM / Sleep: Print last wakeup source on failed wakeup_count write | Date | Thu, 30 May 2013 13:02:17 -0700 |
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Commit a938da06 introduced a useful little log message to tell users/debuggers which wakeup source aborted a suspend. However, this message is only printed if the abort happens during the in-kernel suspend path (after writing /sys/power/state).
The full specification of the /sys/power/wakeup_count facility allows user-space power managers to double-check if wakeups have already happened before it actually tries to suspend (e.g. while it was running user-space pre-suspend hooks), by writing the last known wakeup_count value to /sys/power/wakeup_count. This patch changes the sysfs handler for that node to also print said log message if that write fails, so that we can figure out the offending wakeup source for both kinds of suspend aborts.
Signed-off-by: Julius Werner <jwerner@chromium.org> --- drivers/base/power/wakeup.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c index 79715e7..b0b7886 100644 --- a/drivers/base/power/wakeup.c +++ b/drivers/base/power/wakeup.c @@ -772,6 +772,8 @@ bool pm_save_wakeup_count(unsigned int count) events_check_enabled = true; } spin_unlock_irqrestore(&events_lock, flags); + if (!events_check_enabled) + print_active_wakeup_sources(); return events_check_enabled; } -- 1.7.12.4
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