linux-kernel - Re: [PATCH v4 6/8] PCI: Rework of_pci_get_host_bridge_resources() to devm_of_pci_get_host_bridge

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Message-ID: <CAHp75VeUbjobse6uLeM4h_xXRUw+YUQUN+EOye67AJy77a5euQ@mail.gmail.com>
Date:   Tue, 15 May 2018 19:48:05 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Jan Kiszka <jan.kiszka@...mens.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-pci@...r.kernel.org,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: Re: [PATCH v4 6/8] PCI: Rework of_pci_get_host_bridge_resources() to devm_of_pci_get_host_bridge_resources()

On Tue, May 15, 2018 at 12:07 PM, Jan Kiszka <jan.kiszka@...mens.com> wrote:
> From: Jan Kiszka <jan.kiszka@...mens.com>
>
> of_pci_get_host_bridge_resources() allocates the resource structures it
> fills dynamically, but none of its callers care to release them so far.
> Rather than requiring everyone to do this explicitly, convert the
> existing function to a managed version.

> -               res = kzalloc(sizeof(struct resource), GFP_KERNEL);
> +               res = devm_kzalloc(dev, sizeof(struct resource), GFP_KERNEL);
>                 if (!res) {
>                         err = -ENOMEM;
> -                       goto parse_failed;
> +                       goto failed;
>                 }
>
>                 err = of_pci_range_to_resource(&range, dev_node, res);
>                 if (err) {
> -                       kfree(res);
> +                       devm_kfree(dev, res);
>                         continue;
>                 }

Can't you rather make it better, i.e.

struct resource tmp;
...

err = of_pci_range_to_resource(&range, dev_node, &tmp);
if (err)
   continue;

res = devm_kmemdump();
if (!res) {
 ret = -ENOMEM;
 goto failed;
}

?

-- 
With Best Regards,
Andy Shevchenko