linux-kernel - Re: [PATCH 07/16] ARM: integrator: convert PCI to use generic config accesses

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Message-ID: <CACRpkdZSXWrVudiadVjbhQDS_zQrYttaytW-TUoeFUrc=beD1A@mail.gmail.com>
Date:	Mon, 12 Jan 2015 01:05:12 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Rob Herring <robh@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-pci <linux-pci@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Russell King <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 07/16] ARM: integrator: convert PCI to use generic config accesses

On Sat, Jan 10, 2015 at 10:53 PM, Arnd Bergmann <arnd@...db.de> wrote:
> On Saturday 10 January 2015 22:40:22 Linus Walleij wrote:
>> >  static int v3_read_config(struct pci_bus *bus, unsigned int devfn, int where,
>> >                           int size, u32 *val)
>> >  {
>> > -       addr = v3_open_config_window(bus, devfn, where);
>> > +       int ret = pci_generic_config_read(bus, devfn, where, size, val);
>> >         v3_close_config_window();
>> > +       return ret;
>> >  }
>> >
>> >  static int v3_write_config(struct pci_bus *bus, unsigned int devfn, int where,
>> >                            int size, u32 val)
>> >  {
>> > +       int ret = pci_generic_config_write(bus, devfn, where, size, val);
>> >         v3_close_config_window();
>> > -       raw_spin_unlock_irqrestore(&v3_lock, flags);
>> > +       return ret;
>> >  }
>> >
>> >  static struct pci_ops pci_v3_ops = {
>> > +       .map_bus = v3_open_config_window,
>> >         .read   = v3_read_config,
>> >         .write  = v3_write_config,
>>
>> So .map_bus is called before every .read/.write operation I take it.
>>
>> Wouldn't it be proper to call the v3_close_config_window() from a
>> matching .unmap_bus() callback for symmetry?
>
> It would be nicer for integrator but useless for anything else, so
> I'd vote for leaving it the way Rob posted.

OK I buy that, throw in a comment about it in the code if there
is some time for iterating the patch.

Yours,
Linus Walleij
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