greybus: audio: use variable 'is_connected' to maintain module state

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there is race condition between _disconnect() request &
stop_trigger() in case of abrupt module removal.
And sometimes this can lead to deadlock while acquiring
codec_info->lock.
To avoid such situation, atomic variable is used to maintain
codec connected state.
During dai operations (trigger, shutdown, etc.), 'is_connected'
variable is validated to avoid unnecessary lock acquire in
case module already removed.

Signed-off-by: Vaibhav Agarwal <vaibhav.agarwal@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

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Vaibhav Agarwal 2016-01-28 21:15:40 +05:30 • committed by Greg Kroah-Hartman

parent 796fad441c

commit 3994e0b139

3 changed files with 38 additions and 1 deletions

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17

drivers/staging/greybus/audio_codec.c

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10

drivers/staging/greybus/audio_codec.h

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12

drivers/staging/greybus/audio_topology.c

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