linux-kernel - Re: [PATCH 01/04] PCI: rcar: Register each instance independently

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Date:	Wed, 5 Feb 2014 17:39:13 +0900
From:	Magnus Damm <magnus.damm@...il.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	linux-pci@...r.kernel.org,
	Linux-sh list <linux-sh@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Valentine <valentine.barshak@...entembedded.com>,
	Simon Horman <horms@...ge.net.au>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Ben Dooks <ben.dooks@...ethink.co.uk>
Subject: Re: [PATCH 01/04] PCI: rcar: Register each instance independently

On Wed, Feb 5, 2014 at 5:02 PM, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> On Wed, Feb 5, 2014 at 7:52 AM, Magnus Damm <magnus.damm@...il.com> wrote:
>> +static int rcar_pci_probe(struct platform_device *pdev)
>>  {
>>         struct resource *cfg_res, *mem_res;
>>         struct rcar_pci_priv *priv;
>>         void __iomem *reg;
>> +       struct hw_pci hw;
>>
>>         cfg_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>         reg = devm_ioremap_resource(&pdev->dev, cfg_res);
>> @@ -308,31 +271,26 @@ static int __init rcar_pci_probe(struct
>>         priv->reg = reg;
>>         priv->dev = &pdev->dev;
>>
>> -       return rcar_pci_add_controller(priv);
>> +       memset(&hw, 0, sizeof(hw));
>> +       hw.nr_controllers = 1;
>> +       hw.private_data = (void **)&priv;
>
> This raised a red flag: taking the address of a variable on the stack.
> I know it's correct, as hw.private_data is an array of pointers copied
> by pci_common_init_dev() below.
> But perhaps it's a good idea to turn priv into an array with one element,
> to make this clearer, and avoid the ugly cast?

I simply followed the same style as pci-tegra.c, but I agree that it
can be made prettier. Also, there may be some better way how to
register independent instances, not sure.

Thanks,

/ magnus
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