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struct usb_skel {
     struct usb_device *       udev;                /* the usb device for this device */
     struct usb_interface * interface;           /* the interface for this device */
     struct semaphore       limit_sem;          /* limiting the number of writes in progress */
     unsigned char *          bulk_in_buffer;    /* the buffer to receive data */
     size_t        bulk_in_size;                   /* the size of the receive buffer */
     __u8&nbs


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