Commit 378b8037 authored Jul 09, 2019 by Fabian Henneke Committed by Jiri Kosina Aug 05, 2019

hidraw: Return EPOLLOUT from hidraw_poll

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@gmail.com>
In-reply-to: <CA+hv5qkyis03CgYTWeWX9cr0my-d2Oe+aZo+mjmWRXgjrGqyrw@mail.gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

parent 4832a4da

drivers/hid/hidraw.c

+1 −1

Original line number	Original line	Diff line number	Diff line
	@@ -252,7 +252,7 @@ static __poll_t hidraw_poll(struct file file, poll_table wait)

	poll_wait(file, &list->hidraw->wait, wait);		poll_wait(file, &list->hidraw->wait, wait);
	if (list->head != list->tail)		if (list->head != list->tail)
	return EPOLLIN \| EPOLLRDNORM;		return EPOLLIN \| EPOLLRDNORM \| EPOLLOUT;
	if (!list->hidraw->exist)		if (!list->hidraw->exist)
	return EPOLLERR \| EPOLLHUP;		return EPOLLERR \| EPOLLHUP;
	return 0;		return 0;