[alsa-devel] [PATCH] ASoC: rsnd: Protect register accesses with a spinlock instead of a mutex

[Ben Dooks]

On 23/07/14 22:19, Laurent Pinchart wrote:
> The hardware registers are accessed from atomic contexts (the
> rsnd_soc_dai_trigger function, for instance, is called with the PCM
> substream spinlock held). They thus can't be protected by a mutex.
> 
> Protect regmap register accesses with a spinlock instead of a mutex by
> setting the fast_io flag.

I reported this ages ago.

I ended up removing regmap entirely, it just locks the machine
solid and provides no useful functionality for the driver.

-- 
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius