linux-kernel - Re: Re: [PATCH] regmap: add iopoll-like atomic polling macro

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] [day] [month] [year] [list]

Message-ID: <20200108133608.GB3817@sirena.org.uk>
Date:   Wed, 8 Jan 2020 13:36:08 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Sameer Pujar <spujar@...dia.com>
Cc:     jonathanh@...dia.com, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: Re: Re: [PATCH] regmap: add iopoll-like atomic polling macro

On Wed, Jan 08, 2020 at 10:20:37AM +0530, Sameer Pujar wrote:

> While checking the documentation on snd_soc_dai_ops, it appears trigger() is
> in atomic context.
> This means I cannot use regmap interface (with default configuration) in
> trigger().
> The above issue went away with usage of regmap_read_poll_timeout_atomic()
> and now I think I just got lucky.

It's fine if your regmap is set up to support atomic use (using a flat
or no cache and MMIO) but not for regmaps in general, I'm asking you to
document the fact that it's only usable with some regmaps.

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