From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Date: Fri, 16 Jul 2010 06:28:42 +0000 (-0700)
Subject: Input: evdev - signal that device is writable in evdev_poll()
X-Git-Tag: firefly_0821_release~9833^2~1027^2~1^2~9
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c18fb1396eb809dbc16e51da273a1789f9d799bf;p=firefly-linux-kernel-4.4.55.git

Input: evdev - signal that device is writable in evdev_poll()

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
---

diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index 70c0eb52ca96..054edf346e0b 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -403,10 +403,15 @@ static unsigned int evdev_poll(struct file *file, poll_table *wait)
 {
 	struct evdev_client *client = file->private_data;
 	struct evdev *evdev = client->evdev;
+	unsigned int mask;
 
 	poll_wait(file, &evdev->wait, wait);
-	return ((client->head == client->tail) ? 0 : (POLLIN | POLLRDNORM)) |
-		(evdev->exist ? 0 : (POLLHUP | POLLERR));
+
+	mask = evdev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR;
+	if (client->head != client->tail)
+		mask |= POLLIN | POLLRDNORM;
+
+	return mask;
 }
 
 #ifdef CONFIG_COMPAT