Revert "drivers: base: power: wakeup.c: Use built-in RCU list checking"

This reverts commit 8ba88804bb3b877c841bc1864a8605111580cd0b as a better
version is already in Rafael's tree, sorry about that.

Reported-by: "Rafael J. Wysocki" <[e-mail]>
Cc: Madhuparna Bhowmik <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/base/power/wakeup.c

···
 	int srcuidx;
 
 	srcuidx = srcu_read_lock(&wakeup_srcu);
-	list_for_each_entry_rcu(ws, &wakeup_sources, entry,
-				srcu_read_lock_held(&wakeup_srcu))
+	list_for_each_entry_rcu(ws, &wakeup_sources, entry)
 		dev_pm_arm_wake_irq(ws->wakeirq);
 	srcu_read_unlock(&wakeup_srcu, srcuidx);
 }
···
 	int srcuidx;
 
 	srcuidx = srcu_read_lock(&wakeup_srcu);
-	list_for_each_entry_rcu(ws, &wakeup_sources, entry,
-				srcu_read_lock_held(&wakeup_srcu))
+	list_for_each_entry_rcu(ws, &wakeup_sources, entry)
 		dev_pm_disarm_wake_irq(ws->wakeirq);
 	srcu_read_unlock(&wakeup_srcu, srcuidx);
 }
···
 	struct wakeup_source *last_activity_ws = NULL;
 
 	srcuidx = srcu_read_lock(&wakeup_srcu);
-	list_for_each_entry_rcu(ws, &wakeup_sources, entry,
-				srcu_read_lock_held(&wakeup_srcu)) {
+	list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
 		if (ws->active) {
 			pm_pr_dbg("active wakeup source: %s\n", ws->name);
 			active = 1;
···
 	int srcuidx;
 
 	srcuidx = srcu_read_lock(&wakeup_srcu);
-	list_for_each_entry_rcu(ws, &wakeup_sources, entry,
-				srcu_read_lock_held(&wakeup_srcu)) {
+	list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
 		spin_lock_irq(&ws->lock);
 		if (ws->autosleep_enabled != set) {
 			ws->autosleep_enabled = set;
···
 	}
 
 	*srcuidx = srcu_read_lock(&wakeup_srcu);
-	list_for_each_entry_rcu(ws, &wakeup_sources, entry,
-				srcu_read_lock_held(&wakeup_srcu)) {
+	list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
 		if (n-- <= 0)
 			return ws;
 	}