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

    Yes, but not really important: 10-byte allows a 16-bit allocation
    length (additional data section), where 6-byte only allows 8-bit.

    However, the mode pages the kernel requests from the device are normally
    <= 256 bytes.

    In general, your intuition is correct. use_10_for_foo is largely meant
    for the subclass of "SCSI" devices which often don't bother to implement
    the 6-byte commands, forcing the software driver to emulate 6-byte.
    use_10_for_foo allows the software driver to eliminate that in-kernel
    emulation code.


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      Last update: 2006-08-28 03:23    [W:0.027 / U:13.740 seconds]
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