On Thu, 28 Mar 2013, victor yeo wrote: > There is a problem with SCSI_READ_10 command if looking at usbmon. I > pasted the usbmon log that starts from SCSI_READ_10. Basically, the > SCSI_READ_10 was received by gadget, processed, sent CSW, followed by > control packets. Then another SCSI_READ_10, sent CSW, followed by > control packets. Then another SCSI_READ_10, but CSW is not received by > host. > > There must be problems in the UDC driver. CSW is sent by the UDC > driver but it is not received by the Linux host. > > Thanks, > victor > > f59e13c0 3246885432 S Bo:2:046:1 -115 31 = 55534243 0c000000 00100000 > 80000a28 00000000 00000008 00000000 000000 > f59e13c0 3246885582 C Bo:2:046:1 0 31 > > f59e15c0 3246885594 S Bi:2:046:1 -115 4096 < > f59e15c0 3247150217 C Bi:2:046:1 -75 0 This is the problem. -75 is -EOVERFLOW; it means the host received a packet that was larger than expected. Since the maxpacket value for a bulk-in endpoint is 512, your UDC must be sending bulk DATA packets with more than 512 bytes. 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
