PCM_PACKET_SIZE
memset(rt->out_urbs[i].buffer, 0, PCM_PACKET_SIZE);
#define PCM_BUFFER_SIZE (2 * PCM_N_URBS * PCM_PACKET_SIZE)
if (sub->dma_off + PCM_PACKET_SIZE <= pcm_buffer_size) {
memcpy_swahw32(urb->buffer, source, PCM_PACKET_SIZE);
PCM_PACKET_SIZE - len);
sub->dma_off += PCM_PACKET_SIZE;
sub->period_off += PCM_PACKET_SIZE;
memset(out_urb->buffer, 0, PCM_PACKET_SIZE);
urb->buffer = kzalloc(PCM_PACKET_SIZE, GFP_KERNEL);
PCM_PACKET_SIZE, handler, urb);
.period_bytes_min = PCM_PACKET_SIZE,