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hidraw: Return EPOLLOUT from hidraw_poll

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[ 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>
This commit is contained in:
Fabian Henneke 2019-07-09 13:03:37 +02:00 committed by prashantpaddune
parent ff71eecbaf
commit 1040d4842b
1 changed files with 1 additions and 1 deletions
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2
drivers/hid/hidraw.c
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@ -265,7 +265,7 @@ 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;