Revision 6c601340 hw/usb/hcd-uhci.c

b/hw/usb/hcd-uhci.c
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    /* Allocate new packet */
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    async = uhci_async_alloc(uhci_queue_get(s, td), addr);
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    if (!async)
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        return TD_RESULT_NEXT_QH;
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    /* valid needs to be large enough to handle 10 frame delay
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     * for initial isochronous requests

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