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

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.