From: Fabian Henneke <fabian.henneke@gmail.com>
Date: Thu, 18 Jul 2019 20:50:58 +0000 (+0200)
Subject: hiddev: Return EPOLLOUT from hiddev_poll
X-Git-Tag: for-linus-2019-09-27~26^2~5^2
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=c801aff1a57697d79618ea3e84dc8ff79617669d;p=linux-block.git

hiddev: Return EPOLLOUT from hiddev_poll

Always return EPOLLOUT from hiddev_poll when a device is connected.
This is safe since hiddev_write always fails and improves compatibility
with tools like socat.

Signed-off-by: Fabian Henneke <fabian@henneke.me>
In-reply-to: <nycvar.YFH.7.76.1907171333160.5899@cbobk.fhfr.pm>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
---

diff --git a/drivers/hid/usbhid/hiddev.c b/drivers/hid/usbhid/hiddev.c
index 55b72573066b..73a76d9af974 100644
--- a/drivers/hid/usbhid/hiddev.c
+++ b/drivers/hid/usbhid/hiddev.c
@@ -416,7 +416,7 @@ static __poll_t hiddev_poll(struct file *file, poll_table *wait)
 
 	poll_wait(file, &list->hiddev->wait, wait);
 	if (list->head != list->tail)
-		return EPOLLIN | EPOLLRDNORM;
+		return EPOLLIN | EPOLLRDNORM | EPOLLOUT;
 	if (!list->hiddev->exist)
 		return EPOLLERR | EPOLLHUP;
 	return 0;