On Thu, Aug 9, 2012 at 11:11 PM, Taku Izumi <izumi.taku@xxxxxxxxxxxxxx> wrote:
> From: Yinghai Lu <yinghai@xxxxxxxxxx>
>
> x86, PCI: Fix non acpi path pci_sysdata leaking with release_fn
>
> Non acpi path, or root is not probed from acpi, during root bus removal
> will get warning about leaking from pci_scan_bus_on_node.
>
> Fix it with setting pci_host_bridge release function.
>
> Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
> Signed-off-by: Taku Izumi <izumi.taku@xxxxxxxxxxxxxx>
>
> ---
> arch/x86/pci/common.c | 17 +++++++++++------
> 1 file changed, 11 insertions(+), 6 deletions(-)
>
> Index: Bjorn-next-0808/arch/x86/pci/common.c
> ===================================================================
> --- Bjorn-next-0808.orig/arch/x86/pci/common.c
> +++ Bjorn-next-0808/arch/x86/pci/common.c
> @@ -634,17 +634,19 @@ int pci_ext_cfg_avail(struct pci_dev *de
> return 0;
> }
>
> +static void release_pci_sysdata(struct pci_host_bridge *bridge)
> +{
> + struct pci_sysdata *sd = bridge->release_data;
> +
> + kfree(sd);
> +}
> +
> struct pci_bus * __devinit pci_scan_bus_on_node(int busno, struct pci_ops *ops, int node)
> {
> LIST_HEAD(resources);
> struct pci_bus *bus = NULL;
> struct pci_sysdata *sd;
>
> - /*
> - * Allocate per-root-bus (not per bus) arch-specific data.
> - * TODO: leak; this memory is never freed.
> - * It's arguable whether it's worth the trouble to care.
> - */
> sd = kzalloc(sizeof(*sd), GFP_KERNEL);
> if (!sd) {
> printk(KERN_ERR "PCI: OOM, skipping PCI bus %02x\n", busno);
> @@ -654,7 +656,10 @@ struct pci_bus * __devinit pci_scan_bus_
> x86_pci_root_bus_resources(busno, &resources);
> printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busno);
> bus = pci_scan_root_bus(NULL, busno, ops, sd, &resources);
> - if (!bus) {
> + if (bus)
> + pci_set_host_bridge_release(to_pci_host_bridge(bus->bridge),
> + release_pci_sysdata, sd);
> + else {
> pci_free_resource_list(&resources);
> kfree(sd);
> }
>
The patch itself is OK, but as far as I know, there's no mechanism for
removing a non-ACPI host bridge, so I don't think the release function
will ever be used, will it?
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