linux-kernel - Re: [PATCH 1/7] PCI: tegra: replace devm_request_and_ioremap by devm_ioremap

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Message-ID: <alpine.DEB.2.02.1308191405450.2313@hadrien>
Date:	Mon, 19 Aug 2013 14:07:54 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	Thierry Reding <thierry.reding@...il.com>
cc:	kernel-janitors@...r.kernel.org,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Stephen Warren <swarren@...dotorg.org>,
	linux-tegra@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] PCI: tegra: replace devm_request_and_ioremap by
 devm_ioremap_resource



On Mon, 19 Aug 2013, Thierry Reding wrote:

> On Mon, Aug 19, 2013 at 01:20:35PM +0200, Julia Lawall wrote:
> > From: Julia Lawall <Julia.Lawall@...6.fr>
> >
> > Use devm_ioremap_resource instead of devm_request_and_ioremap.
> >
> > This was done using the semantic patch
> > scripts/coccinelle/api/devm_ioremap_resource.cocci
> >
> > Error-handling code was manually removed from the associated calls to
> > platform_get_resource.
> >
> > Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
> >
> > ---
> > The first block of modified code is followed by a call to
> > devm_request_mem_region for pcie->cs with no associated ioremap.  Should
> > ioremap be used in this case as well?
>
> No. The pcie->cs resource is 256 MiB so it's challenging to map it at
> once. Furthermore it requires a non-linear mapping so we do it on
> demand.

OK, thanks for the explanation.  Is the comment, though, a little
misleading, since the mapping is not done here?

/* request and remap configuration space */

julia
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