On Thu, 21 Apr 2011, yingchun li wrote: > Rajaram > Thank you very much! > I have merge the f_mass_storage from 2.6.34 to my kernel, but > with no lucky, there is still > the transport error. and this time PC get EPROTO after send cmd > 55534243 0b000000 c0000000 8000061a 003f00c0 00000000 00000000 000000 > below is the log from usb-storage(which I rebuilt with debug > messages), usbmon is > almost same with before. > Apr 21 09:47:14 yingchunlipc kernel: [260906.309116] usb-storage: *** > thread awakened. > Apr 21 09:47:14 yingchunlipc kernel: [260906.309119] usb-storage: > Command MODE_SENSE (6 bytes) > Apr 21 09:47:14 yingchunlipc kernel: [260906.309122] usb-storage: 1a > 00 3f 00 c0 00 > Apr 21 09:47:14 yingchunlipc kernel: [260906.309133] usb-storage: Bulk > Command S 0x43425355 T 0xb L 192 F 128 Trg 0 LUN 0 CL 6 > Apr 21 09:47:14 yingchunlipc kernel: [260906.309137] usb-storage: > usb_stor_bulk_transfer_buf: xfer 31 bytes > Apr 21 09:47:14 yingchunlipc kernel: [260906.309195] usb-storage: > Status code 0; transferred 31/31 > Apr 21 09:47:14 yingchunlipc kernel: [260906.309198] usb-storage: -- > transfer complete > Apr 21 09:47:14 yingchunlipc kernel: [260906.309201] usb-storage: Bulk > command transfer result=0 > Apr 21 09:47:14 yingchunlipc kernel: [260906.309205] usb-storage: > usb_stor_bulk_transfer_sglist: xfer 192 bytes, 1 entries > Apr 21 09:47:14 yingchunlipc kernel: [260906.313449] usb-storage: > Status code -71; transferred 0/192 The device crashed and failed to respond to the MODE SENSE command. In your earlier usbmon trace, the device crashed while carrying out the first READ command. If you want to find out what's going wrong, you need to do some debugging on the device rather than on the host. Alan Stern -- 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
