Input: evdev - Modify the process of closing the evdev device to use the synchronize_rcu_expedited interface to speed up the shutdown process.

deepin inclusion
categroy: performace

As Documentations saied:
	synchronize_rcu_expedited() instead
	of synchronize_rcu().  This reduces latency,
	but can increase CPU utilization, degrade
	real-time latency, and degrade energy efficiency.
use it to optimize the shutdown process by
our system developer report where some input dev shutdown
cost many XXms.

Signed-off-by: huangbibo <huangbibo@uniontech.com>
Signed-off-by: tuhaowen <tuhaowen@uniontech.com>
Signed-off-by: Wentao Guan <guanwentao@uniontech.com>

Author: opsiff

drivers/input/evdev.c

@@ -383,7 +383,13 @@ static void evdev_detach_client(struct evdev *evdev,
 	spin_lock(&evdev->client_lock);
 	list_del_rcu(&client->node);
 	spin_unlock(&evdev->client_lock);
-	synchronize_rcu();
+	
+	if (system_state == SYSTEM_HALT ||
+		system_state == SYSTEM_POWER_OFF ||
+		system_state == SYSTEM_RESTART)
+		synchronize_rcu_expedited();
+	else
+		synchronize_rcu();
 }
 
 static int evdev_open_device(struct evdev *evdev)