[PATCH] ASoC: soc-pcm: Fix DPCM lockdep warning due to nested stream locks

[Mark Brown]

On Thu, 13 Jan 2022 15:18:58 +0100, Takashi Iwai wrote:
> The recent change for DPCM locking caused spurious lockdep warnings.
> Actually the warnings are false-positive, as those are triggered due
> to the nested stream locks for FE and BE.  Since both locks belong to
> the same lock class, lockdep sees it as if a deadlock.
> 
> For fixing this, we need take PCM stream locks for BE with the nested
> lock primitives.  Since currently snd_pcm_stream_lock*() helper
> assumes only the top-level single locking, a new helper function
> snd_pcm_stream_lock_irqsave_nested() is defined for a single-depth
> nested lock, which is now used in the BE DAI trigger that is always
> performed inside a FE stream lock.
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-linus

Thanks!

[1/1] ASoC: soc-pcm: Fix DPCM lockdep warning due to nested stream locks
      commit: 3c75c0ea5da749bd1efebd1387f2e5011b8c7d78

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

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Thanks,
Mark