modifications

usb isp1761驱动源代码 可编进内核。

issues:
20/07/2005
1. turnaround /timeout when we didnt get the all the data from the device
  solution: resubmit the td for this case
  status: done	

2. abborting the transfer and completing mass storage urbs	
   solution: not to call urb->complete in case of usb_async_unlink flag is set
   status: done

12/08/2005
1. reading/writing always 4 bytes in dma.c 
   solution: read the remaining bytes to be read/written , and if not
	     multiple of 4 then call appropriately read/write calls
   status: done
		
26/08/2005
1. transaction/turnaround clear bit when retrying the td