Re: [PATCH v5 0/2] usbip: Implement SG support

[Christoph Hellwig]

FYI, I think my

   "usb: add a HCD_DMA flag instead of guestimating DMA capabilities"

is the proper core fix for what your patch 1 works around, as the USB
core should not assume DMA capabilities based on the presence of a DMA
mask.