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    SubjectRe: [PATCH 2.6.18-rc4 1/5] ieee1394: sbp2: workaround for write protect bit of Initio firmware

    On Sun, 27 Aug 2006, Stefan Richter wrote:
    > Yet another mode pages related bug of Initio firmwares was seen.
    > INIC-1530 with a firmware by Initio responded with garbage to MODE SENSE
    > (10). Some HDDs were therefore incorrectly marked as write protected:

    Why does sbp2scsi_slave_configure() set "use_10_for_ms" in the first

    Almost all the other SCSI code seems to default to using the 6-byte
    version, and then only uses the 10-byte version if they have some specific
    reason to do so.

    I don't think there really is _ever_ any reason to use the 10-byte version
    if the 6-byte version is expected to work. Is there?


    - scsi_add_lun() only sets the 10-byte MS for things that are
    black-listed to set it (BLIST_USE_10_BYTE_MS)

    In fact, I don't see _anything_ in the source code that actually does
    set that, so as far as I can see, scsi_add_lun() _never_ asks to use
    the 10-byte modesense.

    - libata does set the 10-byte modesense for all SATA devices (but
    scsi_lib.c might clear it if we get a bad status back).

    - USB devices set the 10-byte version _only_ if it's a non-disk device,
    or if the subclass of the device is not SCSI.

    Anyway, it would appear that sbp2 is the odd man out in setting up for a
    10-byte modesense, and then having to have strange magic rules for
    clearing it again.

    Is there _really_ any reason to use the 10-byte version at all in the
    first place?

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      Last update: 2009-11-18 23:46    [W:0.021 / U:32.280 seconds]
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