Re: "Transfer event TRB DMA ptr not part of current TD" spam after USB disconnection

["Michał Pecio" <michal.pecio@gmail.com>]

Hi Mathias,

I found that the code which causes my problems was specifically added
by your commit d104d0152a97f ("xhci: fix isoc endpoint dequeue from
advancing too far on transaction error").

Reverting this change removes the disconnection spam on my two NEC
hosts (different boards but same 1033:0194 rev 03 chip IDs). I have no
other hosts available to try at this time.

It also resolves similar spam and subsequent stream lockup on one
particular pair of host adapter and device, which suffers intermittent
transaction errors for reasons currently unknown. With d104d0152a97f
reverted this device loses frames as expected but keeps going.

So this surely looks like the right thing to do with my NEC hosts, but
of course d104d0152a97f was done for a reason, which apparently is that
some (unspecified) other hosts really work differently.

Thanks,
Michal