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 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html