Some processes, such as systemd, are only polling for EPOLLERR|EPOLLHUP. As evdev uses unkeyed wakeups, such a poll receives many spurious wakeups from uninteresting events. Use keyed wakeups to allow the wakeup target to more efficiently discard these uninteresting events. Signed-off-by: Kenny Levinsen <kl@xxxxxx> --- drivers/input/evdev.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c index d7dd6fcf2db0..f54d3d31f61d 100644 --- a/drivers/input/evdev.c +++ b/drivers/input/evdev.c @@ -282,7 +282,8 @@ static void evdev_pass_values(struct evdev_client *client, spin_unlock(&client->buffer_lock); if (wakeup) - wake_up_interruptible(&evdev->wait); + wake_up_interruptible_poll(&evdev->wait, + EPOLLIN | EPOLLOUT | EPOLLRDNORM | EPOLLWRNORM); } /* @@ -443,7 +444,7 @@ static void evdev_hangup(struct evdev *evdev) kill_fasync(&client->fasync, SIGIO, POLL_HUP); spin_unlock(&evdev->client_lock); - wake_up_interruptible(&evdev->wait); + wake_up_interruptible_poll(&evdev->wait, EPOLLHUP | EPOLLERR); } static int evdev_release(struct inode *inode, struct file *file) @@ -958,7 +959,7 @@ static int evdev_revoke(struct evdev *evdev, struct evdev_client *client, client->revoked = true; evdev_ungrab(evdev, client); input_flush_device(&evdev->handle, file); - wake_up_interruptible(&evdev->wait); + wake_up_interruptible_poll(&evdev->wait, EPOLLHUP | EPOLLERR); return 0; } -- 2.26.0
