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Input: evdev - use keyed wakeups 

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@kl.wtf>
Link: https://lore.kernel.org/r/20200410233557.3892-1-kl@kl.wtf
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Kenny Levinsen 2020-04-18 21:26:50 -07:00 committed by Dmitry Torokhov
parent ec4ba6c35b
commit 81b4d1d22c
1 changed files with 4 additions and 3 deletions
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7
drivers/input/evdev.c
View File

@ -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;
}