linux-kernel - Re: [PATCH 3/3] ASoC: fsl_ssi: remove register defaults

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Date:	Mon, 11 Jan 2016 19:23:54 -0600
From:	Timur Tabi <timur@...i.org>
To:	Mark Brown <broonie@...nel.org>
Cc:	"Maciej S. Szmigiero" <mail@...iej.szmigiero.name>,
	Fabio Estevam <festevam@...il.com>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	Nicolin Chen <nicoleotsuka@...il.com>,
	Xiubo Li <Xiubo.Lee@...il.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] ASoC: fsl_ssi: remove register defaults

Mark Brown wrote:
> regcache handles this fine, it's perfectly happy to just go and allocate
> the cache as registers get used (this is why the code that's doing the
> allocation exists...).  What is causing problems here is that the first
> access to the register is happening in interrupt context so we can't do
> a GFP_KERNEL allocation for it.

Considering how small and not-sparse the SSI register space is, would 
using REGCACHE_FLAT be appropriate?