Re: [PATCH v4 3/3] PCI: endpoint: pci_epf_create: remove goto labels

From: Lorenzo Pieralisi
Date: Wed Feb 28 2018 - 08:34:49 EST


On Wed, Feb 28, 2018 at 02:07:19PM +0100, Rolf Evers-Fischer wrote:
> From: Rolf Evers-Fischer <rolf.evers.fischer@xxxxxxxxx>
>
> 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@xxxxxxxxx>
> ---
> 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
>