linux-kernel - Re: PATA_ARTOP reads byte from PCI IO port without mapping it to the right address.

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Message-ID: <20110330202628.5dc8db5f@lxorguk.ukuu.org.uk>
Date:	Wed, 30 Mar 2011 20:26:28 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Daniel Palmer <me@...ielpalmer.co.uk>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: PATA_ARTOP reads byte from PCI IO port without mapping it to
 the right address.

> unsigned long io = pci_resource_start(pdev, 4);           // This 
> returns 0x1400 on my machine

That is the PCI port address.

>                  u8 reg;
> 
>                  ppi[0] = &info_628x;
>                  if (inb(io) & 0x10)                                    
>          // This reads from 0x1400, which isn't were the port actually 
> is in the processors address                                             

This reads from I/O port 0x1400 - your inb logic and I/O port mapping on
the platform is responsible for making that work.

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