On Tue, 29 Aug 2023 23:06:37 +0200, Wesley Cheng wrote: > -/* > - * hw_params callback > - * > - * allocate a buffer and set the given audio format. > - * > - * so far we use a physically linear buffer although packetize transfer > - * doesn't need a continuous area. > - * if sg buffer is supported on the later version of alsa, we'll follow > - * that. > - */ > -static int snd_usb_hw_params(struct snd_pcm_substream *substream, > - struct snd_pcm_hw_params *hw_params) > +int snd_usb_attach_endpoints(struct snd_usb_substream *subs, > + struct snd_pcm_hw_params *hw_params) This doesn't only "attach" endpoints, but it does more other things that are needed for PCM hw_params procedure. I'd rather keep hw_params in the function name instead of creating completely different one. Ditto for hw_free. thanks, Takashi