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Currently, critical section is protected by mutex in functions of fireworks_stream.c. Callers increments/decrements substreams counter before calling the functions. Moving mutex to the callers code allows to change type of the substream counter from atomic_t to unsigned int. This commit is a preparation for obsoleting usage of atomic_t for substream counter. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>