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
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Thanks, Mark