Messages in this thread | | | Date | Sun, 27 Aug 2006 21:19:51 -0400 | From | Jeff Garzik <> | Subject | Re: [PATCH 2.6.18-rc4 1/5] ieee1394: sbp2: workaround for write protect bit of Initio firmware |
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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.
Jeff
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