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Message-Id: <20200116231709.604353412@linuxfoundation.org>
Date: Fri, 17 Jan 2020 00:17:59 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Fabian Henneke <fabian.henneke@...il.com>,
Jiri Kosina <jkosina@...e.cz>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 01/71] hidraw: Return EPOLLOUT from hidraw_poll
From: Fabian Henneke <fabian.henneke@...il.com>
[ Upstream commit 378b80370aa1fe50f9c48a3ac8af3e416e73b89f ]
Always return EPOLLOUT from hidraw_poll when a device is connected.
This is safe since writes are always possible (but will always block).
hidraw does not support non-blocking writes and instead always calls
blocking backend functions on write requests. Hence, so far, a call to
poll never returned EPOLLOUT, which confuses tools like socat.
Signed-off-by: Fabian Henneke <fabian.henneke@...il.com>
In-reply-to: <CA+hv5qkyis03CgYTWeWX9cr0my-d2Oe+aZo+mjmWRXgjrGqyrw@...l.gmail.com>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/hid/hidraw.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c
index 5652bd0ffb4d..1ac82e194818 100644
--- a/drivers/hid/hidraw.c
+++ b/drivers/hid/hidraw.c
@@ -260,7 +260,7 @@ static unsigned int hidraw_poll(struct file *file, poll_table *wait)
poll_wait(file, &list->hidraw->wait, wait);
if (list->head != list->tail)
- return POLLIN | POLLRDNORM;
+ return POLLIN | POLLRDNORM | POLLOUT;
if (!list->hidraw->exist)
return POLLERR | POLLHUP;
return 0;
--
2.20.1
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