HelenOS sources

schedule_bulk_intr  414 uspace/drv/bus/usb/xhci/transfers.c 	[USB_TRANSFER_BULK] = schedule_bulk_intr,
schedule_bulk_intr  415 uspace/drv/bus/usb/xhci/transfers.c 	[USB_TRANSFER_INTERRUPT] = schedule_bulk_intr,
HelenOS homepage, sources at GitHub