From: Jiri Kosina <jkosina@suse.cz>
Date: Fri, 10 Jan 2020 14:32:51 +0000 (+0100)
Subject: HID: hidraw, uhid: Always report EPOLLOUT
X-Git-Tag: v3.16.83~77
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2cd104ae7ab56c3ec2c9fa08239392532bc43e72;p=thirdparty%2Fkernel%2Fstable.git

HID: hidraw, uhid: Always report EPOLLOUT

commit 9e635c2851df6caee651e589fbf937b637973c91 upstream.

hidraw and uhid device nodes are always available for writing so we should
always report EPOLLOUT and EPOLLWRNORM bits, not only in the cases when
there is nothing to read.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Fixes: be54e7461ffdc ("HID: uhid: Fix returning EPOLLOUT from uhid_char_poll")
Fixes: 9f3b61dc1dd7b ("HID: hidraw: Fix returning EPOLLOUT from hidraw_poll")
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
[bwh: Backported to 3.16:
 - Use unsigned int type instead of __poll_t
 - s/EPOLL/POLL/g]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c
index e60d9c88bd35e..ef9e196b54a53 100644
--- a/drivers/hid/hidraw.c
+++ b/drivers/hid/hidraw.c
@@ -262,13 +262,14 @@ out:
 static unsigned int hidraw_poll(struct file *file, poll_table *wait)
 {
 	struct hidraw_list *list = file->private_data;
+	unsigned int mask = POLLOUT | POLLWRNORM; /* hidraw is always writable */
 
 	poll_wait(file, &list->hidraw->wait, wait);
 	if (list->head != list->tail)
-		return POLLIN | POLLRDNORM;
+		mask |= POLLIN | POLLRDNORM;
 	if (!list->hidraw->exist)
-		return POLLERR | POLLHUP;
-	return POLLOUT | POLLWRNORM;
+		mask |= POLLERR | POLLHUP;
+	return mask;
 }
 
 static int hidraw_open(struct inode *inode, struct file *file)
diff --git a/drivers/hid/uhid.c b/drivers/hid/uhid.c
index 796b498993eb9..f4063d7884693 100644
--- a/drivers/hid/uhid.c
+++ b/drivers/hid/uhid.c
@@ -720,13 +720,14 @@ unlock:
 static unsigned int uhid_char_poll(struct file *file, poll_table *wait)
 {
 	struct uhid_device *uhid = file->private_data;
+	unsigned int mask = POLLOUT | POLLWRNORM; /* uhid is always writable */
 
 	poll_wait(file, &uhid->waitq, wait);
 
 	if (uhid->head != uhid->tail)
-		return POLLIN | POLLRDNORM;
+		mask |= POLLIN | POLLRDNORM;
 
-	return POLLOUT | POLLWRNORM;
+	return mask;
 }
 
 static const struct file_operations uhid_fops = {