linux-kernel - Re: [RFC PATCH 2/5] HACK: ASoC: Add card->filter

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <YkWRxWjQSnJ9f281@sirena.org.uk>
Date:   Thu, 31 Mar 2022 12:34:29 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Martin Povišer <povik+lin@...ebit.org>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mark Kettenis <kettenis@...nbsd.org>,
        Hector Martin <marcan@...can.st>,
        Sven Peter <sven@...npeter.dev>
Subject: Re: [RFC PATCH 2/5] HACK: ASoC: Add card->filter_controls hook

On Thu, Mar 31, 2022 at 02:04:46AM +0200, Martin Povišer wrote:

> Add a new ASoC card callback for filtering the kcontrols of the card's
> constituent components. This lets the card take over some of the
> controls, deciding their value instead of leaving it up to userspace.

Define "filter".  What is this trying to accomplish?  As a matter of
policy we don't put use case configuration in the kernel, the goal is to
avoid having to update the kernel when people decide to do new things
with their userspace.

> Also, and here's the HACK: part, move dapm_new_widgets call in front
> of the card's late_probe call. This way all kcontrols should have been
> created (and are safe to use) by the time late_probe is called.

This will break any card that adds new controls, you could add a second
call earlier but deleting the existing call is going to break other
users.

Download attachment "signature.asc" of type "application/pgp-signature" (489 bytes)