linux-kernel - Re: [PATCH v2] HID: usbhid: do not sleep when opening device

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Message-ID: <20200818115906.GA26874@latitude>
Date:   Tue, 18 Aug 2020 13:59:06 +0200
From:   Johannes Hirte <johannes.hirte@...enkhaos.de>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        groeck@...omium.org, Nicolas Boichat <drinkcat@...omium.org>,
        linux-usb@...r.kernel.org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] HID: usbhid: do not sleep when opening device

On 2020 Jun 09, Dmitry Torokhov wrote:
> usbhid tries to give the device 50 milliseconds to drain its queues when
> opening the device, but dies it naively by simply sleeping in open handler,
> which slows down device probing (and thus may affect overall boot time).
> 
> However we do not need to sleep as we can instead mark a point of time in
> the future when we should start processing the events.
> 
> Reported-by: Nicolas Boichat <drinkcat@...omium.org>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> ---
> 

This change breaks various Logitech devices: 
https://bugzilla.kernel.org/show_bug.cgi?id=208935

-- 
Regards,
  Johannes Hirte