From c8b4bc552cef9e24427b12fee8763d1702f8d57a Mon Sep 17 00:00:00 2001 From: Ruchi Kandoi Date: Wed, 8 Apr 2015 15:42:29 -0700 Subject: [PATCH] wakeup: Add last wake up source logging for suspend abort reason. There is a possibility that a wakeup source event is received after the device prepares to suspend which might cause the suspend to abort. This patch adds the functionality of reporting the last active wakeup source which is currently not active but caused the suspend to abort reason via the /sys/kernel/power/last_wakeup_reason file. Change-Id: I1760d462f497b33e425f5565cb6cff5973932ec3 Signed-off-by: Ruchi Kandoi --- drivers/base/power/wakeup.c | 22 +++++++++++++++++++--- 1 file changed, 19 insertions(+), 3 deletions(-) diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c index bea700736f24..4b35cc08c3b6 100644 --- a/drivers/base/power/wakeup.c +++ b/drivers/base/power/wakeup.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include "power.h" @@ -661,16 +662,31 @@ EXPORT_SYMBOL_GPL(pm_wakeup_event); void pm_get_active_wakeup_sources(char *pending_wakeup_source, size_t max) { - struct wakeup_source *ws; + struct wakeup_source *ws, *last_active_ws = NULL; int len = 0; + bool active = false; + rcu_read_lock(); - len += snprintf(pending_wakeup_source, max, "Pending Wakeup Sources: "); list_for_each_entry_rcu(ws, &wakeup_sources, entry) { if (ws->active) { - len += snprintf(pending_wakeup_source + len, max, + if (!active) + len += scnprintf(pending_wakeup_source, max, + "Pending Wakeup Sources: "); + len += scnprintf(pending_wakeup_source + len, max - len, "%s ", ws->name); + active = true; + } else if (!active && + (!last_active_ws || + ktime_to_ns(ws->last_time) > + ktime_to_ns(last_active_ws->last_time))) { + last_active_ws = ws; } } + if (!active && last_active_ws) { + scnprintf(pending_wakeup_source, max, + "Last active Wakeup Source: %s", + last_active_ws->name); + } rcu_read_unlock(); } EXPORT_SYMBOL_GPL(pm_get_active_wakeup_sources); -- 2.34.1