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SubjectRe: [PATCH] 2.5.15 IDE 62
>And then you make sure that nobody EVER uses any other lock than the queue

Except that some controllers are perfectly safe to use both channels
at the same time, except when dealing with rare and sensible operations
(like changing channel settings) where a common set of registers is
shared between channels.

The controller driver in this case will want a lock per channel queue
and an internal lock to protect access to these shared registers. But
that lock can (and has to be) hidden in the controller driver.


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