linux-kernel - Re: [PATCH 3/3] sdhci-pltfm: Do not print errors in case of an extended iomem size

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Date:	Mon, 03 May 2010 08:01:00 +0200
From:	Richard Röjfors 
	<richard.rojfors@...agicore.com>
To:	Anton Vorontsov <avorontsov@...sta.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	David Vrabel <david.vrabel@....com>,
	Pierre Ossman <pierre@...man.eu>, Ben Dooks <ben@...tec.co.uk>,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] sdhci-pltfm: Do not print errors in case of an extended
 iomem size

On 04/23/2010 08:25 PM, Anton Vorontsov wrote:
> On Wed, Mar 17, 2010 at 07:02:52AM +0100, Richard Röjfors wrote:
>> On 3/16/10 7:34 PM, Anton Vorontsov wrote:
>>> Some hosts have an extended SDHCI iomem size, so the driver should
>>> only print errors if the iomem size is less than 0x100.
>>
>> With this change you allow a bigger resource than we really need.
>> I think you should also change request_mem_region and ioremap to only
>> request and map the actual needed size. (0x100)
>
> Sorry for the delayed response.
>
> Why do you think that mapping more than "needed" is a bad thing?
> Looking into the PCI driver, it just maps the whole PCI BAR (which
> makes sense, since later SDHCI spec might easily introduce an
> extended address space, so hardcoding 0x100 isn't very good).
>
> There is another case when mapping the whole SDHCI mem space
> might be convenient: if the platform code will want to use
> the ioremapped region inside the platform hooks.

That's a good reason.

Acked-by: Richard Röjfors <richard.rojfors@...agicore.com>

>
> Thanks!
>
>>> Signed-off-by: Anton Vorontsov<avorontsov@...mvista.com>
>>> ---
>>>   drivers/mmc/host/sdhci-pltfm.c |    2 +-
>>>   1 files changed, 1 insertions(+), 1 deletions(-)
>>>
>>> diff --git a/drivers/mmc/host/sdhci-pltfm.c b/drivers/mmc/host/sdhci-pltfm.c
>>> index 217b911..b6ee0d7 100644
>>> --- a/drivers/mmc/host/sdhci-pltfm.c
>>> +++ b/drivers/mmc/host/sdhci-pltfm.c
>>> @@ -61,7 +61,7 @@ static int __devinit sdhci_pltfm_probe(struct platform_device *pdev)
>>>   		goto err;
>>>   	}
>>>
>>> -	if (resource_size(iomem) != 0x100)
>>> +	if (resource_size(iomem)<  0x100)
>>>   		dev_err(&pdev->dev, "Invalid iomem size. You may "
>>>   			"experience problems.\n");
>>>
>>
>
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