netdev - Re: [PATCH 2/5] stmmac: pci: use managed resources

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Date:	Wed, 22 Oct 2014 00:55:03 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	netdev@...r.kernel.org,
	Kweh Hock Leong <hock.leong.kweh@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	Vince Bridgers <vbridgers2013@...il.com>
Subject: Re: [PATCH 2/5] stmmac: pci: use managed resources

Hello.

On 10/21/2014 08:35 PM, Andy Shevchenko wrote:

> Migrate pci driver to managed resources to reduce boilerplate error handling
> code.

> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>   drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c | 46 +++++-------------------
>   1 file changed, 8 insertions(+), 38 deletions(-)

> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c
> index 5459a4e..f8d4ce2 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_pci.c
> @@ -65,45 +65,29 @@ static int stmmac_pci_probe(struct pci_dev *pdev,
>   			    const struct pci_device_id *id)
>   {
>   	int ret = 0;
> -	void __iomem *addr = NULL;
>   	struct stmmac_priv *priv = NULL;
> -	int i;
> +	int pci_bar = 0;

    I don't see this variable changing anywhere...

>   	/* Enable pci device */
> -	ret = pci_enable_device(pdev);
> +	ret = pcim_enable_device(pdev);
>   	if (ret) {
>   		pr_err("%s : ERROR: failed to enable %s device\n", __func__,
>   		       pci_name(pdev));
>   		return ret;
>   	}
> -	if (pci_request_regions(pdev, STMMAC_RESOURCE_NAME)) {
> -		pr_err("%s: ERROR: failed to get PCI region\n", __func__);
> -		ret = -ENODEV;
> -		goto err_out_req_reg_failed;
> -	}
> +	ret = pcim_iomap_regions(pdev, BIT(pci_bar), pci_name(pdev));
> +	if (ret)
> +		return ret;
>
> -	/* Get the base address of device */
> -	for (i = 0; i <= 5; i++) {
> -		if (pci_resource_len(pdev, i) == 0)
> -			continue;
> -		addr = pci_iomap(pdev, i, 0);
> -		if (addr == NULL) {
> -			pr_err("%s: ERROR: cannot map register memory aborting",
> -			       __func__);
> -			ret = -EIO;
> -			goto err_out_map_failed;
> -		}
> -		break;
> -	}

    It's not an equivalent change: the old code mapped a first existing BAR, 
you always map BAR0. Are you sure that's what you meant? If so, wouldn't hurt 
to describe this in the changelog...

WBR, Sergei

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