Input: use full RCU API
RT guys alerted me to the fact that in their tree spinlocks
are preemptible and it is better to use full RCU API
(rcu_read_lock()/rcu_read_unlock()) to be safe.
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/joydev.c b/drivers/input/joydev.c
index f306c97..2b201f9 100644
--- a/drivers/input/joydev.c
+++ b/drivers/input/joydev.c
@@ -149,8 +149,10 @@
event.time = jiffies_to_msecs(jiffies);
+ rcu_read_lock();
list_for_each_entry_rcu(client, &joydev->client_list, node)
joydev_pass_event(client, &event);
+ rcu_read_unlock();
wake_up_interruptible(&joydev->wait);
}
@@ -178,12 +180,7 @@
spin_lock(&joydev->client_lock);
list_add_tail_rcu(&client->node, &joydev->client_list);
spin_unlock(&joydev->client_lock);
- /*
- * We don't use synchronize_rcu() here because read-side
- * critical section is protected by a spinlock (dev->event_lock)
- * instead of rcu_read_lock().
- */
- synchronize_sched();
+ synchronize_rcu();
}
static void joydev_detach_client(struct joydev *joydev,
@@ -192,7 +189,7 @@
spin_lock(&joydev->client_lock);
list_del_rcu(&client->node);
spin_unlock(&joydev->client_lock);
- synchronize_sched();
+ synchronize_rcu();
}
static int joydev_open_device(struct joydev *joydev)