Re: [RFC/CFT] cmd640 irqlocking fixes

From: Alan Cox (alan@lxorguk.ukuu.org.uk)
Date: Thu Jul 25 2002 - 09:33:22 EST


On Thu, 2002-07-25 at 13:30, Andre Hedrick wrote:
>
> EEK!
>
> Alan, how are you going to sync to access to the shared HBA registers if
> the lock is decoupled from the main loop? Since there are general
> register mucking abouts during data transfers, iirc the behavors of the
> CMD640B I use for testing. You have me a little close to the edge of my
> seat on concern.

>From inspection I don't believe this is a problem. Also for example they
have not been synchronized for some time on VLB with no apparent
problems. If there are cases where PCI config needs synchronizing here
(which I dont believe is the case) then the caller should be holding the
io_request lock anyway, and seems to

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