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Date: Thu, 11 Apr 2002 14:22:17 +0200
From: Martin Dalecki <dalecki@evision-ventures.com>
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To: Bill Davidsen <davidsen@tmr.com>
CC: Baldur Norddahl <bbn-linux-kernel@clansoft.dk>,
        linux-kernel@vger.kernel.org
Subject: Re: More than 10 IDE interfaces
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Bill Davidsen wrote:
> On Thu, 11 Apr 2002, Martin Dalecki wrote:
> 
> 
>>Baldur Norddahl wrote:
>>
>>>Hi,
>>>
>>>I have a machine with the following configuration:
>>>
>>>2 on board IDE interfaces (AMD chipset)
>>>2 Promise Technology UltraDMA100 controllers with each 2 IDE interfaces.
>>>4 Promise Technology UltraDMA133 controllers with each 2 IDE interfaces.
>>>
>>>This adds up to 14 IDE interfaces. And I just discovered that the kernel
>>>only supports 10 IDE interfaces :-(
>>>
>>>So I tried to hack the kernel, and I was partially successfull. I changed
>>>MAX_HWIF from 10 to 14. I made up some major numbers for the extra
>>
>>In your case if should be changed to 15 there is an off by one error here in the
>>interpretation of this constant.

>   Anyway, if you have a moment to hint why an off by one error is not
> biting us on ten drives I'd be interested.

I think simply (not tested) that MAX_HWIF provides only 9 possible interfaces 
right now.

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