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PM / sleep: Print active wakeup sources when blocking on wakeup_count reads

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If there are any wakeup events being processed, read operation
on /sys/power/wakeup_count will be blocked, so print the names
of all active wakeup sources to help to find out who is preventing
system suspend from triggering.

While at it change pr_info() in pm_print_active_wakeup_sources()
to pr_debug() to avoid excessive log noise.

Signed-off-by: xing wei <xing.wei@intel.com>
[ rjw: Subject & changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
xing wei 2016-12-07 19:31:16 +08:00 committed by Rafael J. Wysocki
parent b53f40db59
commit 9320f95c0b
1 changed files with 3 additions and 3 deletions
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6
drivers/base/power/wakeup.c
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@ -811,7 +811,7 @@ void pm_print_active_wakeup_sources(void)
rcu_read_lock();
list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
if (ws->active) {
pr_info("active wakeup source: %s\n", ws->name);
pr_debug("active wakeup source: %s\n", ws->name);
active = 1;
} else if (!active &&
(!last_activity_ws ||
@ -822,7 +822,7 @@ void pm_print_active_wakeup_sources(void)
}
if (!active && last_activity_ws)
pr_info("last active wakeup source: %s\n",
pr_debug("last active wakeup source: %s\n",
last_activity_ws->name);
rcu_read_unlock();
}
@ -905,7 +905,7 @@ bool pm_get_wakeup_count(unsigned int *count, bool block)
split_counters(&cnt, &inpr);
if (inpr == 0 || signal_pending(current))
break;
pm_print_active_wakeup_sources();
schedule();
}
finish_wait(&wakeup_count_wait_queue, &wait);