[Bug 227602] [regression] r304629 broke ralink USB hostap mode with authmode WPA2

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227602

--- Comment #9 from Damjan Jovanovic <damjan.jov at gmail.com> ---
Apparently r304629 was added because qemu needed these back to back DMA jobs
for its emulated XHCI controller (in bug 212021). But qemu is cross platform,
just like my USB dongle. How does Windows get both of them to work? How does
Linux? Other BSDs? Do they all use these back to back DMA jobs, or does only
FreeBSD use them?

Also I can - very rarely - get the WiFi dongle to work even with r304629
applied. It only works 19.67% of the time. Could there be some kind of timing
issue or race condition, that is being exacerbated by r304629? Let me try get a
usbdump of one of these rare cases. I think it should be very revealing.

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