[PATCH v3 2/2] ASoC: soc-pcm: constrain hw_params when DAIs share the same BCLK

[Mark Brown]

On Mon, May 18, 2026 at 02:21:09PM +0800, Troy Mitchell wrote:
> When multiple CPU DAIs on the same sound card share the same physical
> BCLK, add a hw_rule during PCM open that constrains the sample rate so
> the resulting BCLK rate stays consistent across all sharing DAIs.

> +	/*
> +	 * Protect the rtd list traversal.  No nesting: this callback runs
> +	 * from snd_pcm_hw_refine() which does not hold card->mutex.
> +	 */
> +	guard(mutex)(&card->mutex);

We have helpers for acquiring these mutexes which deal with some lockdep
issues using subclasses.  Either use those or provide whatever's needed
to have the equivalent thing in a guard.
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