linux-kernel - Re: [PATCH] ARM: davinci: dma: Convert to devm

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Message-ID: <5194DC6A.8080609@cogentembedded.com>
Date:	Thu, 16 May 2013 17:17:30 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Lad Prabhakar <prabhakar.csengg@...il.com>
CC:	Sekhar Nori <nsekhar@...com>,
	DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
	LAK <linux-arm-kernel@...ts.infradead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: davinci: dma: Convert to devm_* api

Hello.

On 16-05-2013 10:58, Lad Prabhakar wrote:

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

> Use devm_ioremap_resource instead of reques_mem_region()/ioremap() and
> devm_request_irq() instead of request_irq().

> This ensures more consistent error values and simplifies error paths.

> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>
> ---
>   NOte:- Boot tested on Logic-PD OMAP-L138 EVM

>   arch/arm/mach-davinci/dma.c |   63 ++++++++++++++++--------------------------
>   1 files changed, 24 insertions(+), 39 deletions(-)

> diff --git a/arch/arm/mach-davinci/dma.c b/arch/arm/mach-davinci/dma.c
> index 45b7c71..aeda496 100644
> --- a/arch/arm/mach-davinci/dma.c
> +++ b/arch/arm/mach-davinci/dma.c
[...]
> @@ -1422,25 +1421,16 @@ static int __init edma_probe(struct platform_device *pdev)
>   			found = 1;
>   		}
>
> -		len[j] = resource_size(r[j]);
> -
> -		r[j] = request_mem_region(r[j]->start, len[j],
> -			dev_name(&pdev->dev));
> -		if (!r[j]) {
> -			status = -EBUSY;
> -			goto fail1;
> -		}
> -
> -		edmacc_regs_base[j] = ioremap(r[j]->start, len[j]);
> -		if (!edmacc_regs_base[j]) {
> +		edmacc_regs_base[j] = devm_ioremap_resource(&pdev->dev, r[j]);
> +		if (IS_ERR(edmacc_regs_base[j])) {
>   			status = -EBUSY;

    And you call that "more consistent error values"? Why not:

			status = PTR_ERR(edmacc_regs_base[j]);

>  		edma_cc[j] = kzalloc(sizeof(struct edma), GFP_KERNEL);

    Maybe it's worth using devm_kzalloc() too?

WBR, Sergei

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