PM / suspend: show workqueue state in suspend flow

If freezable workqueue aborts suspend flow, show
workqueue state for debug purpose.

Signed-off-by: Roger Lu <roger.lu@mediatek.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

2 files changed, 5 insertions, 2 deletions

diff --git a/kernel/power/process.c b/kernel/power/process.c
index df058bed53ce..6eef250a5705 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -89,6 +89,9 @@ static int try_to_freeze_tasks(bool user_only)
                        elapsed_msecs / 1000, elapsed_msecs % 1000,
                        todo - wq_busy, wq_busy);
 
+                if (wq_busy)
+                        show_workqueue_state();
+
                 if (!wakeup) {
                         read_lock(&tasklist_lock);
                         for_each_process_thread(g, p) {
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index e1c0e996b5ae..619e80ce4a59 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -4369,8 +4369,8 @@ static void show_pwq(struct pool_workqueue *pwq)
 /**
  * show_workqueue_state - dump workqueue state
  *
- * Called from a sysrq handler and prints out all busy workqueues and
- * pools.
+ * Called from a sysrq handler or try_to_freeze_tasks() and prints out
+ * all busy workqueues and pools.
  */
 void show_workqueue_state(void)
 {