From: vichy
> hi all:
> I use kernel 3.8.0
> And when I plug in webcam in my platform xhci host, I get below message:
>
> platform-xhci platform-xhci.0: ERROR no room on ep ring, try ring expansion
> platform-xhci platform-xhci.0: ring expansion succeed, now has 4 segments
> platform-xhci platform-xhci.0: ERROR Transfer event TRB DMA ptr not
> part of current TD
>
> under what circumstance the controller will return TRB DMA which is
> not part of TD?
When the event TRB contains a pointer to something other than a data
buffer.
This is true for one of the error events.
Not that they should happen either.
David
> Is it possible to workaround this issue by modifying xhci-mem.c for
> extending segments?
>
> appreciate your help in advance,
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