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| author | Takashi Iwai <tiwai@suse.de> | 2022-01-19 18:52:48 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2022-01-28 18:59:16 +0300 |
| commit | 3c75c0ea5da749bd1efebd1387f2e5011b8c7d78 (patch) | |
| tree | f3499a08a5f027fb77dfc214addb175289ed69cb /LICENSES | |
| parent | fb25621da5702c104ce0a48de5b174ced09e5b4e (diff) | |
| download | linux-3c75c0ea5da749bd1efebd1387f2e5011b8c7d78.tar.xz | |
ASoC: soc-pcm: Fix DPCM lockdep warning due to nested stream locks
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 to 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.
Fixes: b2ae80663008 ("ASoC: soc-pcm: serialize BE triggers")
Reported-and-tested-by: Hans de Goede <hdegoede@redhat.com>
Reported-and-tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/73018f3c-9769-72ea-0325-b3f8e2381e30@redhat.com
Link: https://lore.kernel.org/alsa-devel/9a0abddd-49e9-872d-2f00-a1697340f786@samsung.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20220119155249.26754-2-tiwai@suse.de
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'LICENSES')
0 files changed, 0 insertions, 0 deletions