On Mon, 24 Jan 2011, Jasper Mackenzie wrote: > Thanks Alan, > >> I have a MP3/MP4/Etc. media player (http://www.dse.co.nz/dse.shop/4d3c841a01d07c462741c0a87f3b06b5/Product/View/A5148) which when plugged in is mostly detected as a usb_storage device, with size and capacity detected. Unfortunatley after that I get the reset high speed USB device using ehci_hcd and device descriptor read/64, error -110 errors. > >> http://pastebin.com/Y4fxZ8qb The device mounts fine in badVista using the standard usbblk driver. > >> > >> The device is similar to a Coby device MP815 which claims to be an MTP device. None of the mtp tools work as the usb subsystem seems to be locked up whilst the MP3 player is plugged in. > >> > > > > The log shows that your device is buggy (it uses the wrong tag in a CSW > > packet after an error). The patch below should work around the bug. > > Let me know how it works. > > > > Alan Stern > > > > > > Index: usb-2.6/drivers/usb/storage/unusual_devs.h > > =================================================================== > > --- usb-2.6.orig/drivers/usb/storage/unusual_devs.h > > +++ usb-2.6/drivers/usb/storage/unusual_devs.h > > @@ -1872,6 +1872,12 @@ UNUSUAL_DEV( 0x1908, 0x3335, 0x0200, 0x0 > > US_SC_DEVICE, US_PR_DEVICE, NULL, > > US_FL_NO_READ_DISC_INFO ), > > > > +UNUSUAL_DEV( 0x1e74, 0x4621, 0x0000, 0x0000, > > + "Coby Electronics", > > + "MP3 Player", > > + US_SC_DEVICE, US_PR_DEVICE, NULL, > > + US_FL_BULK_IGNORE_TAG ), > > + > > UNUSUAL_DEV( 0x2116, 0x0320, 0x0001, 0x0001, > > "ST", > > "2A", > > > The patch did the trick. The device is detected and can be mounted. It is very slow tho: > hdparm -tT /dev/sdb > > /dev/sdb: > Timing cached reads: 114 MB in 2.00 seconds = 57.00 MB/sec > Timing buffered disk reads: 4 MB in 3.89 seconds = 1.03 MB/sec > > With the following appearing in the kernel log:[ 272.338030] sd 2:0:0:0: [sdb] Unhandled error code > [ 272.338034] sd 2:0:0:0: [sdb] Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK > [ 272.338038] sd 2:0:0:0: [sdb] CDB: Read(10): 28 00 00 00 20 00 00 00 f0 00 > [ 272.338046] end_request: I/O error, dev sdb, sector 8192 > > Is there anything that can be done about this? Maybe. But I'd have to see a debugging log or a usbmon trace (see Documentation/usb/usbmon.txt) to figure out the cause of the error. 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
