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Subject: Re: [RFC/CFT] cmd640 irqlocking fixes
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Andre Hedrick <andre@linux-ide.org>
Cc: martin@dalecki.de, Vojtech Pavlik <vojtech@suse.cz>,
       William Lee Irwin III <wli@holomorphy.com>,
       linux-kernel@vger.kernel.org
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Date: 25 Jul 2002 15:33:22 +0100
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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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