[PATCH 02/17] ASoC: soc-dai: don't overwide dai->driver->ops

[broonie at kernel.org]

On Thu, Apr 23, 2020 at 08:14:05AM +0900, Kuninori Morimoto wrote:
> 
> From: Kuninori Morimoto <kuninori.morimoto.gx at renesas.com>
> 
> Current ASoC overwides dai->driver->ops if it was NULL.
> But, it is not good idea, because dai->driver might be reused
> when modprobe/rmmod or bind/unbind, etc.

> This patch checks dai->driver->ops when use DAI callbacks,
> and removes null_dai_ops from ASoC.

This is fine but it's not a correctness issue since we're always filling
the same value in - the big issue with putting stuff in structures is
when you end up using the same struct for two different different things
so you fill different values in.
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