xhci handling ring expansion

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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?
Is it possible to workaround this issue by modifying xhci-mem.c for
extending segments?

appreciate your help in advance,
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