ALSA: hda - Fix concurrent hash accesses

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The amp and caps hashes aren't protected properly for concurrent
accesses.  Protect them via a new mutex now.

But it can't be so simple as originally thought: since the update of a
hash table entry itself might trigger the power-up sequence which
again accesses the hash table, we can't cover the whole function
simply via mutex.  Thus the update part has to be split from the mutex
and revalidated.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

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This commit is contained in:

Takashi Iwai 2012-05-10 16:11:15 +02:00

parent e3245cddcf

commit c3b6bcc292

2 changed files with 121 additions and 81 deletions

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sound/pci/hda/hda_codec.c

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1

sound/pci/hda/hda_codec.h

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