hi! i've been working on some TX hangs and USB transfer timeouts in rtwn on my RTL8811AU, RTL8192 and RTL8188 USB NICs.
I traced it all down to how USB transfers are being done, and it causes issues with these NICs on XHCI. https://reviews.freebsd.org/D47522 Please test and let me know. I'd like to land it soon! Thanks, -adrian
