linux-kernel - Re: [PATCH] net: mv643xx_eth: use managed devm

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Date:	Wed, 10 Apr 2013 22:41:40 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
CC:	Lennert Buytenhek <buytenh@...tstofly.org>,
	Andrew Lunn <andrew@...n.ch>,
	Jason Cooper <jason@...edaemon.net>,
	Florian Fainelli <florian@...nwrt.org>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: mv643xx_eth: use managed devm_kzalloc

Hello.

On 04/10/2013 09:38 PM, Sebastian Hesselbarth wrote:

> This patch moves shared private data kzalloc to managed devm_kzalloc and
> cleans now unneccessary kfree and error handling.
>
> Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
> ---
> Note that there is also an ioremap call, that could be transferred to
> devm_ioremap_resource. But as long as mv643xx_eth and mvmdio iomem
> resources overlap, this will throw -EBUSY.
>
> Cc: Lennert Buytenhek <buytenh@...tstofly.org>
> Cc: Andrew Lunn <andrew@...n.ch>
> Cc: Jason Cooper <jason@...edaemon.net>
> Cc: Florian Fainelli <florian@...nwrt.org>
> Cc: netdev@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> ---
>   drivers/net/ethernet/marvell/mv643xx_eth.c |   17 ++++-------------
>   1 file changed, 4 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/net/ethernet/marvell/mv643xx_eth.c b/drivers/net/ethernet/marvell/mv643xx_eth.c
> index bbe6104..955baab 100644
> --- a/drivers/net/ethernet/marvell/mv643xx_eth.c
> +++ b/drivers/net/ethernet/marvell/mv643xx_eth.c
> @@ -2547,25 +2547,22 @@ static int mv643xx_eth_shared_probe(struct platform_device *pdev)
>   	struct mv643xx_eth_shared_private *msp;
>   	const struct mbus_dram_target_info *dram;
>   	struct resource *res;
> -	int ret;
>   
>   	if (!mv643xx_eth_version_printed++)
>   		pr_notice("MV-643xx 10/100/1000 ethernet driver version %s\n",
>   			  mv643xx_eth_driver_version);
>   
> -	ret = -EINVAL;
>   	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>   	if (res == NULL)
> -		goto out;
> +		return -EINVAL;
>   
> -	ret = -ENOMEM;
> -	msp = kzalloc(sizeof(*msp), GFP_KERNEL);
> +	msp = devm_kzalloc(&pdev->dev, sizeof(*msp), GFP_KERNEL);
>   	if (msp == NULL)
> -		goto out;
> +		return -ENOMEM;
>   
>   	msp->base = ioremap(res->start, resource_size(res));
>   	if (msp->base == NULL)
> -		goto out_free;
> +		return -EADDRNOTAVAIL;

    -ENOMEM usually.

WBR, Sergei

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