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f8ff2f28ba
We call ack callback whenever appl_ptr gets updated via pcm_lib_apply_appl_ptr(). There are various code paths to call this function. A part of them are for read/write/forward/rewind, where the appl_ptr is always changed and thus the call of ack is mandatory. OTOH, another part of code paths are from the explicit user call, e.g. via SYNC_PTR ioctl. There, we may receive the same appl_ptr value, and in such a case, calling ack is obviously superfluous. This patch adds the check of the given appl_ptr value, and returns immediately if it's no real update. Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>