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

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Message-ID: <5165C8E4.7030401@gmail.com>
Date:	Wed, 10 Apr 2013 22:17:40 +0200
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.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

On 04/10/2013 08:41 PM, Sergei Shtylyov wrote:
> 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.

Sergei,

I was looking at the example for devm_request_and_ioremap() in
lib/devres.c. There it is -EADDRNOTAVAIL which is returned on
failing ioremap.

Actually, I was hoping to also use devm_ioremap_resource() for
the above, but that is too early as mv643xx_eth and mvmdio have
overlapping mem resources. Changing this will require some more
step-by-step patches that get also tested on arch/ppc and others
using platform mv643xx_eth.

But, I can send an updated patch with -ENOMEM above if required.

Sebastian
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