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    SubjectRe: usb device problem
    Mark Lord napsal(a):
    > Mmm.. okay, a quick glance at the USB storage code revealed one instance:
    >
    > /* Did we transfer less than the minimum amount required? */
    > if (srb->result == SAM_STAT_GOOD &&
    > srb->request_bufflen - srb->resid < srb->underflow)
    > srb->result = (DID_ERROR << 16) | (SUGGEST_RETRY << 24);
    >
    > return;
    >
    > So I suppose this *could* be the driver thinking it had a bad sector,
    > but it really looks like it's guessing. The code also appears to be
    > instrumented for some kind of USB tracing.. If you can figure out how
    > to turn that on, then the trace will probably tell us what is really
    > going on there.
    > Look for a file called "usbmon.txt" in the Documentation/usb/ subdir
    > of your kernel source tree. It describes how to do the tracing.

    Did you want me to do something like this:
    http://www.fi.muni.cz/~xslaby/sklad/usbmon/?M=A

    usb2 means usb bus 2.

    without "a"s commands was:

    [connect the device]
    mount /dev/sdb usb/ [filesystem is vfat]
    dd if=/dev/zero of=usb/zero1 bs=1k count=3
    [wait some time to let system syncing automagically]
    umount usb/
    [disconnect the device]



    with "a" there is only difference in dd command:
    ...
    dd if=/dev/zero of=usb/zero2 bs=1k count=5
    ...

    The first serie is without the error in the latter one appeared (some time after
    `dd', when system syncs):
    sd 6:0:0:0: SCSI error: return code = 0x10070000
    end_request: I/O error, dev sdb, sector 8223
    [same as before]



    I have i386 arch, so 4096 is PAGE_SIZE, when it syncs only one dirty page, it
    seems to be OK, otherwise it's not, if this helps in any way.

    thanks,
    --
    Jiri Slaby www.fi.muni.cz/~xslaby
    \_.-^-._ jirislaby@gmail.com _.-^-._/
    B67499670407CE62ACC8 22A032CC55C339D47A7E
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