Hi,

Started hacking streams support into qemu, trapped into this one:

[  218.807129] xhci_hcd 0000:00:0f.0: ERROR Transfer event for disabled
endpoint or incorrect stream ring
[  218.808087] xhci_hcd 0000:00:0f.0: @000000003c32d560 38342000
00000000 01000000 01078001

Triggers after xhci emulation stepping over the first link trb for a
stream ring.

I think it's because xhci doesn't manage the trb_address_map radix tree
correctly.  I can only find a single radix_tree_insert() call in the
code, and that one is for the initial segment.  But nobody seems to
update the radix tree when linking the next segment ...

cheers,
  Gerd
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