The usbd_open_pipe_intr(9) man page discusses the usbd_callback type and the usbd_transfer(9) man page mentions the associated interrupt context in which (presumably) that callback executes.
Are there any particular restrictions that apply while running from within that interrupt context?In particular, I'm wondering if it's safe to invoke add_true_randomness(9) from
within that interrupt context. In addition to the specific answer, pointers to docs/references are welcome. Devin
