linux-kernel - Re: [PATCH v3] ACPI: PCI: Release excess memory usage.

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Message-ID: <CAJZ5v0iUG01cMG7hqgAh21qobtC_RJEkppbD0fLPZRYCpe=Caw@mail.gmail.com>
Date: Fri, 9 May 2025 20:50:52 +0200
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Zhe Qiao <qiaozhe@...as.ac.cn>
Cc: rafael@...nel.org, lenb@...nel.org, bhelgaas@...gle.com, will@...nel.org, 
	sunilvl@...tanamicro.com, Markus.Elfring@....de, linux-acpi@...r.kernel.org, 
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] ACPI: PCI: Release excess memory usage.

On Wed, Apr 30, 2025 at 8:06 AM Zhe Qiao <qiaozhe@...as.ac.cn> wrote:
>
> In the pci_acpi_scan_root() function, when creating a PCI bus fails,
> we need to free up the previously allocated memory, which can avoid
> invalid memory usage and save resources.
>
> Fixes: 789befdfa389 ("arm64: PCI: Migrate ACPI related functions to pci-acpi.c")
> Signed-off-by: Zhe Qiao <qiaozhe@...as.ac.cn>

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

and I'm expecting this to go in via PCI.

> ---
> V2 -> V3
>     1. Modify commit description.
>     2. Add release operation for ecam mapping resources.
> ---
>
>  drivers/pci/pci-acpi.c | 23 +++++++++++++----------
>  1 file changed, 13 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
> index af370628e583..e00790ecdc0f 100644
> --- a/drivers/pci/pci-acpi.c
> +++ b/drivers/pci/pci-acpi.c
> @@ -1676,24 +1676,19 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
>                 return NULL;
>
>         root_ops = kzalloc(sizeof(*root_ops), GFP_KERNEL);
> -       if (!root_ops) {
> -               kfree(ri);
> -               return NULL;
> -       }
> +       if (!root_ops)
> +               goto free_ri;
>
>         ri->cfg = pci_acpi_setup_ecam_mapping(root);
> -       if (!ri->cfg) {
> -               kfree(ri);
> -               kfree(root_ops);
> -               return NULL;
> -       }
> +       if (!ri->cfg)
> +               goto free_root_ops;
>
>         root_ops->release_info = pci_acpi_generic_release_info;
>         root_ops->prepare_resources = pci_acpi_root_prepare_resources;
>         root_ops->pci_ops = (struct pci_ops *)&ri->cfg->ops->pci_ops;
>         bus = acpi_pci_root_create(root, root_ops, &ri->common, ri->cfg);
>         if (!bus)
> -               return NULL;
> +               goto free_cfg;
>
>         /* If we must preserve the resource configuration, claim now */
>         host = pci_find_host_bridge(bus);
> @@ -1710,6 +1705,14 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
>                 pcie_bus_configure_settings(child);
>
>         return bus;
> +
> +free_cfg:
> +       pci_ecam_free(ri->cfg);
> +free_root_ops:
> +       kfree(root_ops);
> +free_ri:
> +       kfree(ri);
> +       return NULL;
>  }
>
>  void pcibios_add_bus(struct pci_bus *bus)
> --
> 2.43.0
>