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, -- 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