[ALSA] This patch removes open_mutex from the ad1848-lib as
open and close operations are called only from pcm layer and mutexed there with pcm->open_mutex. Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@perex.cz>
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