Hi, I developed an custom USB Audio driver. In addition, I am also using the provided USB Audio driver for commercial USB Audio devices. After some testing with the custom USB Audio driver and the provided USB Audio driver, there seem to be a problem with the ALSA memory allocation routine. In file pcm_memory.c function setup_pcm_id, the id is generated using the pcm device ID, stream ID, and substream number. This only guarantee that the memory tag ID is unique for one card. If I have multiple cards, they will not be unique. Am I correct?
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