linux-kernel - Re: [PATCH 1/3] platform: add common resource requesting and mapping helper

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Date:	Wed, 1 Feb 2012 10:22:00 +0800
From:	Barry Song <21cnbao@...il.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Barry Song <Barry.Song@....com>,
	Atsushi Nemoto <anemo@....ocn.ne.jp>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	linux-kernel@...r.kernel.org, workgroup.linux@....com,
	Grant Likely <grant.likely@...retlab.ca>,
	linux-mtd@...ts.infradead.org, Barry Song <Baohua.Song@....com>,
	David Woodhouse <dwmw2@...radead.org>,
	Erik Gilling <konkers@...gle.com>
Subject: Re: [PATCH 1/3] platform: add common resource requesting and mapping helper

Linus,

2012/2/1 Linus Walleij <linus.walleij@...aro.org>:
> On Tue, Jan 31, 2012 at 11:00 AM, Barry Song <Barry.Song@....com> wrote:
>
>> From: Barry Song <Baohua.Song@....com>
>>
>> this patch helps to move the common pattern from
>
> Good idea!
>
>> @@ -44,6 +44,7 @@ extern struct device platform_bus;
>>
>>  extern void arch_setup_pdev_archdata(struct platform_device *);
>>  extern struct resource *platform_get_resource(struct platform_device *, unsigned int, unsigned int);
>> +extern void __iomem *platform_devm_request_and_ioremap(struct platform_device *, unsigned int);
>
> But don't you want a reverse call for the module remove() function?
>
> Like:
>
> extern void __iomem *platform_devm_iounmap_and_free(struct
> platform_device *, unsigned int);

that point is we have the garbage collection mechanism by calling
devm_ function families. everything is undone on driver detach.
so we will not have the free and unmap things.
>
> ?
>
> Yours,
> Linus Walleij

-barry
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