| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.9 01/97] hidraw: Return EPOLLOUT from hidraw_poll | Date | Wed, 22 Jan 2020 10:28:05 +0100 |
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From: Fabian Henneke <fabian.henneke@gmail.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@gmail.com> In-reply-to: <CA+hv5qkyis03CgYTWeWX9cr0my-d2Oe+aZo+mjmWRXgjrGqyrw@mail.gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Sasha Levin <sashal@kernel.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 750c16897130..225456c1a39a 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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