linux-kernel - Re: [PATCH 07/20] PCI: implement Devres interface to map PCI config space

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Date:   Thu, 2 Mar 2017 21:08:00 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Arnd Bergmann <arnd@...db.de>,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Russell King <linux@...linux.org.uk>,
        Pratyush Anand <pratyush.anand@...il.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Mingkai Hu <mingkai.hu@...escale.com>,
        John Garry <john.garry@...wei.com>,
        Tanmay Inamdar <tinamdar@....com>,
        Murali Karicheri <m-karicheri2@...com>,
        Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>,
        Ray Jui <rjui@...adcom.com>,
        Wenrui Li <wenrui.li@...k-chips.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Minghuan Lian <minghuan.Lian@...escale.com>,
        Jon Mason <jonmason@...adcom.com>,
        Gabriele Paoloni <gabriele.paoloni@...wei.com>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        Michal Simek <michal.simek@...inx.com>,
        Stanimir Varbanov <svarbanov@...sol.com>,
        Zhou Wang <wangzhou1@...ilicon.com>,
        Roy Zang <tie-fei.zang@...escale.com>
Subject: Re: [PATCH 07/20] PCI: implement Devres interface to map PCI config
 space

On Thu, Mar 02, 2017 at 02:24:06PM -0500, Tejun Heo wrote:
> Hello,
> 
> On Thu, Mar 02, 2017 at 02:50:00PM +0200, Andy Shevchenko wrote:
> > > I thought about that and did not do it because here we are remapping
> > > resources that are _not_ PCI bus resources (ie it is not PCI BARs we
> > > are remapping), keeping the devm_* prefix would be more consistent
> > > to the typical device drivers remapping functions pattern (ie a
> > > typical PCI host controller driver would mix devm_ and pcim_ calls
> > > which is a bit hard to parse), that was my rationale.
> > >
> > > I am not too fussed about that either way, I am happy to update it to
> > > pcim_* though, it is Bjorn/Arnd's decision.
> > 
> > I would vote for pcim_*() variant.
> 
> Me too, for brevity.

devm_* is equally brief. Also, all existing pcim_*() functions take a
struct pci_dev * as their first argument, because they operate on the
PCI devices. However in this case the devm_pci_remap_*() functions do
not operate on PCI devices. Rather they operate on the struct device
that represents the PCI host bridge. Therefore I think devm_ is more
appropriate here.

Thierry

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