linux-kernel - Re: [alsa-devel] [PATCH] ASoC: mediatek: Use current HW pointer for pointer callback

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Date:	Thu, 03 Dec 2015 12:07:26 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Mark Brown <broonie@...nel.org>
Cc:	Koro Chen <koro.chen@...iatek.com>, lgirdwood@...il.com,
	alsa-devel@...a-project.org, srv_heupstream@...iatek.com,
	s.hauer@...gutronix.de, linux-kernel@...r.kernel.org,
	linux-mediatek@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [alsa-devel] [PATCH] ASoC: mediatek: Use current HW pointer for pointer callback

On Thu, 03 Dec 2015 12:01:58 +0100,
Mark Brown wrote:
> 
> On Thu, Dec 03, 2015 at 10:41:38AM +0100, Takashi Iwai wrote:
> 
> > While reading this patch, I wondered how regmap can be used safely in
> > an irq-disabled context.  Mark, do we have any API for that?
> 
> We can use user supplied locks or spin_lock_irqsave().

I meant how to guarantee to make regmap_read() working in an already
spin-locked context, typically in an irq handler?  regmap_read()
involves with the regcache and it may invoke kmalloc().


Takashi
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