Input: uinput - fix returning EPOLLOUT from uinput_poll

holtmann · dtor · commit d4b675e1b527 · 2019-12-04T17:58:15.000-08:00
Always return EPOLLOUT from uinput_poll to allow polling /dev/uinput for writable state. Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Link: https://lore.kernel.org/r/20191204025014.5189-1-marcel@holtmann.org Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c
@@ -695,7 +695,7 @@ static __poll_t uinput_poll(struct file *file, poll_table *wait)
 	if (udev->head != udev->tail)
 		return EPOLLIN | EPOLLRDNORM;
 
-	return 0;
+	return EPOLLOUT | EPOLLWRNORM;
 }
 
 static int uinput_release(struct inode *inode, struct file *file)

Original file line number	Diff line number	Diff line change
`@@ -695,7 +695,7 @@ static __poll_t uinput_poll(struct file file, poll_table wait)`
`695`	`695`	`if (udev->head != udev->tail)`
`696`	`696`	`return EPOLLIN \| EPOLLRDNORM;`
`697`	`697`
`698`		`- return 0;`
	`698`	`+ return EPOLLOUT \| EPOLLWRNORM;`
`699`	`699`	`}`
`700`	`700`
`701`	`701`	`static int uinput_release(struct inode inode, struct file file)`