linux-kernel - Re: [PATCH 1/7] platform/x86: fujitsu-laptop: do not use kfifo for storing hotkey scancodes

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Date:   Thu, 22 Jun 2017 16:58:09 -0700
From:   Darren Hart <dvhart@...radead.org>
To:     Michał Kępień <kernel@...pniu.pl>
Cc:     Jonathan Woithe <jwoithe@...t42.net>,
        Rafael Wysocki <rjw@...ysocki.net>,
        Andy Shevchenko <andy@...radead.org>,
        platform-driver-x86@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] platform/x86: fujitsu-laptop: do not use kfifo for
 storing hotkey scancodes

On Thu, Jun 22, 2017 at 10:46:19PM +0200, Michał Kępień wrote:
> > The events seen by userspace with the original code would be "A-press",
> > "B-press", "A-release", "B-release".  With the revised code the order of the
> > release events would be reversed compared to the previous behaviour.  That
> > is, unless I've misunderstood how sparse_keymap_report_event() works.
> 
> All you wrote above is correct and this patch does change the order of
> release events sent to userspace when multiple hotkeys are pressed
> simultaneously.  The question is: is it relevant for any practical
> scenario?
> 
> Anyway, I find this matter to be of secondary importance.  The primary
> objective of this patch is to get rid of the kfifo.  If anyone has
> strong feelings about the change in event ordering, I will be happy to
> revert to FIFO in v2.

This all looks reasonable to me, I don't see anything requiring a respin.

-- 
Darren Hart
VMware Open Source Technology Center