tree 8026a505f9b4509e8f2a43431ea61f0b2bffa4c6
parent 1465d06a6d8580e73ae65f8590392df58c5ed2fd
author Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> 1632511456 -0500
committer Takashi Iwai <tiwai@suse.de> 1632817346 +0200

ALSA: hda: hdac_ext_stream: fix potential locking issues

The code for hdac_ext_stream seems inherited from hdac_stream, and
similar locking issues are present: the use of the bus->reg_lock
spinlock is inconsistent, with only writes to specific fields being
protected.

Apply similar fix as in hdac_stream by protecting all accesses to
'link_locked' and 'decoupled' fields, with a new helper
snd_hdac_ext_stream_decouple_locked() added to simplify code
changes.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20210924192417.169243-4-pierre-louis.bossart@linux.intel.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>