Re: [PATCH] IDE cleanups for 2.6.4-rc1 (2/3)

[Jeff Garzik]

Bartlomiej Zolnierkiewicz wrote:
> [IDE] remove ide_cmd_type_parser() logic
>
> Set ide_task_t fields (command_type, handler and prehandler) directly.
> Remove unused ide_task_t->posthandler and all ide_cmd_type_parser() logic.
>
> ide_cmd_type_parser() was meant to be used for ioctls but
> ended up checking validity of kernel generated requests (doh!).
>
> Rationale for removal:
> - it can't be used for existing ioctls (changes the way they work)
> - kernel shouldn't check validity of (root only) user-space requests
>   (it can and should be done in user-space)
> - it wastes CPU cycles on going through parsers
> - it makes code harder to understand/follow
>   (now info about request is localized)


Without the annoyingly-large 'switch', how do you figure out whether a 
command is non-data, pio-read, pio-write, dma-read, or dma-write?

	Jeff



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