Scsi - Index of

1076 return USB_STOR_TRANSPORT_NO_SENSE;
1077 }
1078
1079 /* command good -- note that data could be short */
1080 return USB_STOR_TRANSPORT_GOOD;
1081
1082 case US_BULK_STAT_FAIL:
1083 /* command failed */
1084 return USB_STOR_TRANSPORT_FAILED;
1085
1086 case US_BULK_STAT_PHASE:
1087 /* phase error -- note that a transport reset will be
1088 * invoked by the invoke_transport() function
1089 */
1090 return USB_STOR_TRANSPORT_ERROR;
1091 }
1092
1093 /* we should never get here, but if we do, we're in trouble */
1094 return USB_STOR_TRANSPORT_ERROR;
1095 }
154
看傻了吧,这个函数也不是好惹的.但正是这个函数掀开了我们bulk 传输的新篇章.
迷雾重重的 Bulk 传输(三)
在usb_stor_Bulk_transport()中, 古人一针见血的为我们指出了这个函数中调用的第一个最重要的
函数,那就是usb_stor_bulk_transfer_buf().仍然是来自drivers/usb/stroage/transport.c.
409 /*
410 * Transfer one buffer via bulk pipe, without timeouts, but allowing early
411 * termination. Return codes are USB_STOR_XFER_xxx. If the bulk pipe
412 * stalls during the transfer, the halt is automatically cleared.
413 */
414 int usb_stor_bulk_transfer_buf(struct us_data *us, unsigned int pipe,
415 void *buf, unsigned int length, unsigned int *act_len)
416 {
417 int result;
418
419 US_DEBUGP("%s: xfer %u bytes\n", __FUNCTION__, length);
420
421 /* fill and submit the URB */
422 usb_fill_bulk_urb(us->current_urb, us->pusb_dev, pipe, buf, length,
423 usb_stor_blocking_completion, NULL);
424 result = usb_stor_msg_common(us, 0);
425