I don't need to treat the (half-)empty Tx and Rx FIFO cases.
I don't need to treat the (half-)empty Tx and Rx FIFO cases.

Only the DMA-challenged host controllers need to, so don't panic!

While at it add some more debug messages when the interrupt returns 0.

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars