linux-kernel - Re: [PATCH v2 2/5] media: davinci: vpif: Convert to devm

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Date:	Sun, 26 May 2013 18:15:19 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
CC:	Prabhakar Lad <prabhakar.csengg@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	LMML <linux-media@...r.kernel.org>
Subject: Re: [PATCH v2 2/5] media: davinci: vpif: Convert to devm_* api

Hello.

On 26-05-2013 4:49, Laurent Pinchart wrote:

>> From: Lad, Prabhakar <prabhakar.csengg@...il.com>

>> Use devm_ioremap_resource instead of reques_mem_region()/ioremap().
>> This ensures more consistent error values and simplifies error paths.

>> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>
>> ---
>>   drivers/media/platform/davinci/vpif.c |   27 ++++-----------------------
>>   1 files changed, 4 insertions(+), 23 deletions(-)

>> diff --git a/drivers/media/platform/davinci/vpif.c
>> b/drivers/media/platform/davinci/vpif.c index 761c825..164c1b7 100644
>> --- a/drivers/media/platform/davinci/vpif.c
>> +++ b/drivers/media/platform/davinci/vpif.c
[...]
>> @@ -421,23 +419,12 @@ EXPORT_SYMBOL(vpif_channel_getfid);
>>
>>   static int vpif_probe(struct platform_device *pdev)
>>   {
>> -	int status = 0;
>> +	static struct resource	*res;
>>
>>   	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> -	if (!res)
>> -		return -ENOENT;
>> -
>> -	res_len = resource_size(res);
>> -
>> -	res = request_mem_region(res->start, res_len, res->name);
>> -	if (!res)
>> -		return -EBUSY;
>> -
>> -	vpif_base = ioremap(res->start, res_len);
>> -	if (!vpif_base) {
>> -		status = -EBUSY;
>> -		goto fail;
>> -	}
>> +	vpif_base = devm_ioremap_resource(&pdev->dev, res);
>> +	if (IS_ERR(vpif_base))
>> +		return PTR_ERR(vpif_base);

> You're loosing the request_mem_region().

    He's not losing anything, first look at how devm_ioremp_resource() 
is defined.

> You should use devm_request_and_ioremap()

     Already deprecated by now.

> function instead of devm_ioremap_resource(). With
> that change,

> Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

WBR, Sergei

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