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

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Date:	Mon, 19 Aug 2013 14:15:39 +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 02:07:54PM +0200, Julia Lawall wrote:
> >
> >
> > 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 */
>
> Yes, that's misleading. Given that it doesn't really add anything useful
> information either, perhaps I should just remove it.

OK, or maybe something like

/* request configuration space, but remap later, on demand */

To make it clear that something different is intended than the
devm_ioremap_resources that come just before..

julia
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