linux-kernel - Re: [PATCH] hidraw: Fix returning EPOLLOUT from hidraw

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Message-ID: <nycvar.YFH.7.76.1912091353020.4603@cbobk.fhfr.pm>
Date:   Mon, 9 Dec 2019 13:53:15 +0100 (CET)
From:   Jiri Kosina <jikos@...nel.org>
To:     Marcel Holtmann <marcel@...tmann.org>
cc:     Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Fabian Henneke <fabian.henneke@...il.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hidraw: Fix returning EPOLLOUT from hidraw_poll

On Wed, 4 Dec 2019, Marcel Holtmann wrote:

> When polling a connected /dev/hidrawX device, it is useful to get the
> EPOLLOUT when writing is possible. Since writing is possible as soon as
> the device is connected, always return it.
> 
> Right now EPOLLOUT is only returned when there are also input reports
> are available. This works if devices start sending reports when
> connected, but some HID devices might need an output report first before
> sending any input reports. This change will allow using EPOLLOUT here as
> well.
> 
> Fixes: 378b80370aa1 ("hidraw: Return EPOLLOUT from hidraw_poll")
> Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
> Cc: stable@...r.kernel.org

Applied, thanks Marcel.

-- 
Jiri Kosina
SUSE Labs