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This commit is a preparation to notify parameter change of register DSP to userspace application. A simple queue is added to store encoded data for the change as long as ALSA hwdep character device is opened by application. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20211015080826.34847-11-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>