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| author | Takashi Iwai | 2012-05-10 16:11:15 +0200 |
|---|---|---|
| committer | Takashi Iwai | 2012-05-10 16:12:13 +0200 |
| commit | c3b6bcc292da80ea08a979af177538ffdbbae36b (patch) | |
| tree | 42202b40e340567e58feeeeeaf680c58c71d0196 /sound/pci/hda/hda_codec.h | |
| parent | ALSA: hda - Protect SPDIF-related stuff via spdif_mutex (diff) | |
| download | kernel-qcow2-linux-c3b6bcc292da80ea08a979af177538ffdbbae36b.tar.gz kernel-qcow2-linux-c3b6bcc292da80ea08a979af177538ffdbbae36b.tar.xz kernel-qcow2-linux-c3b6bcc292da80ea08a979af177538ffdbbae36b.zip | |
ALSA: hda - Fix concurrent hash accesses
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>
Diffstat (limited to 'sound/pci/hda/hda_codec.h')
| -rw-r--r-- | sound/pci/hda/hda_codec.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sound/pci/hda/hda_codec.h b/sound/pci/hda/hda_codec.h index fce30b42bc46..29a311b05f2d 100644 --- a/sound/pci/hda/hda_codec.h +++ b/sound/pci/hda/hda_codec.h @@ -827,6 +827,7 @@ struct hda_codec { struct mutex spdif_mutex; struct mutex control_mutex; + struct mutex hash_mutex; struct snd_array spdif_out; unsigned int spdif_in_enable; /* SPDIF input enable? */ const hda_nid_t *slave_dig_outs; /* optional digital out slave widgets */ |