linux-kernel - Re: [PATCH v4 3/3] PCI: endpoint: pci_epf

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Date:   Wed, 28 Feb 2018 13:33:23 +0000
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Rolf Evers-Fischer <embedded24@...rs-fischer.de>
Cc:     kishon@...com, bhelgaas@...gle.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, andy.shevchenko@...il.com,
        Rolf Evers-Fischer <rolf.evers.fischer@...iv.com>
Subject: Re: [PATCH v4 3/3] PCI: endpoint: pci_epf_create: remove goto labels

On Wed, Feb 28, 2018 at 02:07:19PM +0100, Rolf Evers-Fischer wrote:
> From: Rolf Evers-Fischer <rolf.evers.fischer@...iv.com>
> 
> Removes the goto labels completely, handles the errors at the
> respective call site and just returns instead of jumping around.
> 
> Signed-off-by: Rolf Evers-Fischer <rolf.evers.fischer@...iv.com>
> ---
>  drivers/pci/endpoint/pci-epf-core.c | 30 +++++++++---------------------
>  1 file changed, 9 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/pci/endpoint/pci-epf-core.c b/drivers/pci/endpoint/pci-epf-core.c
> index 1878a6776519..cf2c4f6590a0 100644
> --- a/drivers/pci/endpoint/pci-epf-core.c
> +++ b/drivers/pci/endpoint/pci-epf-core.c
> @@ -203,16 +203,14 @@ struct pci_epf *pci_epf_create(const char *name)
>  	int len;
>  
>  	epf = kzalloc(sizeof(*epf), GFP_KERNEL);
> -	if (!epf) {
> -		ret = -ENOMEM;
> -		goto err_ret;
> -	}
> +	if (!epf)
> +		return ERR_PTR(-ENOMEM);
>  
>  	len = strchrnul(name, '.') - name;
>  	epf->name = kstrndup(name, len, GFP_KERNEL);
>  	if (!epf->name) {
> -		ret = -ENOMEM;
> -		goto free_epf;
> +		kfree(epf);
> +		return ERR_PTR(-ENOMEM);
>  	}
>  
>  	dev = &epf->dev;
> @@ -221,24 +219,14 @@ struct pci_epf *pci_epf_create(const char *name)
>  	dev->type = &pci_epf_type;
>  
>  	ret = dev_set_name(dev, "%s", name);
> -	if (ret)
> -		goto put_dev;
> -
> -	ret = device_add(dev);
> -	if (ret)
> -		goto put_dev;
> -
> -	return epf;
> +	if (!ret) {
> +		ret = device_add(dev);
> +		if (!ret)
> +			return epf;
> +	}

This is ugly, sorry. I should have been more explicit, I prefer
this construct:

ret = dev_set_name(dev, "%s", name);
if (ret) {
	kfree(epf->name);
	kfree(epf);
	return ERR_PTR(ret);
}

ret = device_add(dev);
if (ret) {
	put_device(dev);
	return ERR_PTR(ret);
}

return epf;

Please send a v5 and let's be done with it.

Thanks,
Lorenzo

> -put_dev:
>  	put_device(dev);
>  	return ERR_PTR(ret);
> -
> -free_epf:
> -	kfree(epf);
> -
> -err_ret:
> -	return ERR_PTR(ret);
>  }
>  EXPORT_SYMBOL_GPL(pci_epf_create);
>  
> -- 
> 2.16.2
>