linux-kernel - [PATCH 3.16 074/245] HID: uhid: Fix returning EPOLLOUT from uhid_char

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Date:   Fri, 24 Apr 2020 00:05:01 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Marcel Holtmann" <marcel@...tmann.org>,
        "Jiri Kosina" <jkosina@...e.cz>
Subject: [PATCH 3.16 074/245] HID: uhid: Fix returning EPOLLOUT from
 uhid_char_poll

3.16.83-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Marcel Holtmann <marcel@...tmann.org>

commit be54e7461ffdc5809b67d2aeefc1ddc9a91470c7 upstream.

Always return EPOLLOUT from uhid_char_poll to allow polling /dev/uhid
for writable state.

Fixes: 1f9dec1e0164 ("HID: uhid: allow poll()'ing on uhid devices")
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
[bwh: Backported to 3.16: s/EPOLL/POLL/g]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/hid/uhid.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/hid/uhid.c
+++ b/drivers/hid/uhid.c
@@ -726,7 +726,7 @@ static unsigned int uhid_char_poll(struc
 	if (uhid->head != uhid->tail)
 		return POLLIN | POLLRDNORM;
 
-	return 0;
+	return POLLOUT | POLLWRNORM;
 }
 
 static const struct file_operations uhid_fops = {