[PATCH v4 12/13] rv: Fix read_lock scope in per-task DA cleanup

[Gabriele Monaco]

The da_monitor_reset_all() function for per-task monitors takes
tasklist_lock while iterating over tasks, then keeps it also while
iterating over idle tasks (one per CPU). The latter is not necessary
since the lock needs to guard only for_each_process_thread().

Use a scoped_guard for more compact syntax and adjust the scope only
where the lock is necessary.

Reviewed-by: Wen Yang <wen.yang@xxxxxxxxx>
Reviewed-by: Nam Cao <namcao@xxxxxxxxxxxxx>
Signed-off-by: Gabriele Monaco <gmonaco@xxxxxxxxxx>
---
 include/rv/da_monitor.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/rv/da_monitor.h b/include/rv/da_monitor.h
index 34b8fba9e..08e5d0c59 100644
--- a/include/rv/da_monitor.h
+++ b/include/rv/da_monitor.h
@@ -334,12 +334,12 @@ static void __da_monitor_reset_all(void (*reset)(struct da_monitor *))
 	struct task_struct *g, *p;
 	int cpu;
 
-	read_lock(&tasklist_lock);
-	for_each_process_thread(g, p)
-		reset(da_get_monitor(p));
+	scoped_guard(read_lock, &tasklist_lock) {
+		for_each_process_thread(g, p)
+			reset(da_get_monitor(p));
+	}
 	for_each_present_cpu(cpu)
 		reset(da_get_monitor(idle_task(cpu)));
-	read_unlock(&tasklist_lock);
 }
 
 static void da_monitor_reset_all(void)
-- 
2.54.0