linux-kernel - Re: [PATCH] /drivers/char sx.c ioremap -> pci

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Date:	Fri, 24 Aug 2007 21:34:39 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	Jiri Slaby <jirislaby@...il.com>, postfail@...hmail.com,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] /drivers/char sx.c ioremap -> pci_ioremap api

On Fri, 24 Aug 2007 22:03:42 +0200
Jiri Slaby <jirislaby@...il.com> wrote:

> Alan Cox napsal(a):
> > ase, 0x80);
> >> remove also the hwbase var.
> >>
> >>> +	rebase = pci_iomap(pdev, 0, 0x80);
> >>>   	t = readl(rebase + CNTRL_REG_OFFSET);
> > 
> > Switch to ioread* if you are using the iomap interface. Its not a trivial
> 
> Why, if you know it's surely a mem region (and thus you rely on it and do
> ioremap)? There are many places in the kernel, where this approach is used, e.g.
> libata piix.

Every single one of them is wrong. The encoding of iomap values is
platform dependant. Fixed in my tree.
> 
> > conversion and its slower and bulkier - the original ioremap was much
> > better
> 
> at least get rid of the reading the hwbase address from pci conf space, use
> pci_resource_start instead.

Agreed entirely
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