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HID: uhid: Fix returning EPOLLOUT from uhid_char_poll

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commit be54e7461f upstream.

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

Fixes: 1f9dec1e01 ("HID: uhid: allow poll()'ing on uhid devices")
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Cc: stable@vger.kernel.org
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Marcel Holtmann
2019-12-04 03:43:55 +01:00
committed by Greg Kroah-Hartman
parent 2aa4a4c509
commit 4d29a64055
1 changed files with 2 additions and 1 deletions
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3
drivers/hid/uhid.c
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@@ -26,6 +26,7 @@
#include <linux/uhid.h>
#include <linux/wait.h>
#include <linux/uaccess.h>
#include <linux/eventpoll.h>
#define UHID_NAME "uhid"
#define UHID_BUFSIZE 32
@@ -774,7 +775,7 @@ static unsigned int uhid_char_poll(struct file *file, poll_table *wait)
if (uhid->head != uhid->tail)
return POLLIN | POLLRDNORM;
return 0;
return EPOLLOUT | EPOLLWRNORM;
}
static const struct file_operations uhid_fops = {