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Both __snd_pcm_lib_read() and __snd_pcm_write() functions have almost the same code to loop over samples. For simplification, this patch unifies both as the single helper, __snd_pcm_lib_xfer(). Other than that, there should be no functional change by this patch. Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>