linux-kernel - Re: [PATCH 2/2] dell-wmi: Process only one event on devices with interface version 0

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Message-ID: <20151228134056.GC7540@eudyptula.hq.kempniu.pl>
Date:	Mon, 28 Dec 2015 14:40:56 +0100
From:	Michał Kępień <kernel@...pniu.pl>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Darren Hart <dvhart@...radead.org>,
	Gabriele Mazzotta <gabriele.mzt@...il.com>,
	Andy Lutomirski <luto@...nel.org>,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] dell-wmi: Process only one event on devices with
 interface version 0

> BIOS/ACPI on devices with WMI interface version 0 does not clear buffer
> before filling it. So next time when BIOS/ACPI send WMI event which is
> smaller as previous then it contains garbage in buffer from previous event.
> 
> BIOS/ACPI on devices with WMI interface version 1 clears buffer and
> sometimes send more events in buffer at one call.

Are the explanations above based on your observations or perhaps some
documentation?

-- 
Best regards,
Michał Kępień
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