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SubjectRe: [PATCH v6 20/30] sparc/PCI: Use pci_scan_host_bridge() for simplicity
On Mon, Mar 09, 2015 at 10:34:17AM +0800, Yijing Wang wrote:
> Now we could use pci_scan_host_bridge() to scan
> pci buses, provide sparc specific pci_host_bridge_ops.
>
> Signed-off-by: Yijing Wang <wangyijing@huawei.com>
> CC: "David S. Miller" <davem@davemloft.net>
> CC: sparclinux@vger.kernel.org
> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
> ---
> arch/sparc/kernel/pci.c | 32 ++++++++++++++++++++++----------
> 1 files changed, 22 insertions(+), 10 deletions(-)
>
> diff --git a/arch/sparc/kernel/pci.c b/arch/sparc/kernel/pci.c
> index 21f804a..7e28f74 100644
> --- a/arch/sparc/kernel/pci.c
> +++ b/arch/sparc/kernel/pci.c
> @@ -650,12 +650,25 @@ static void pci_claim_bus_resources(struct pci_bus *bus)
> pci_claim_bus_resources(child_bus);
> }
>
> +static void pci_host_bridge_of_scan_bus(
> + struct pci_host_bridge *host)
> +{
> + struct pci_pbm_info *pbm = dev_get_drvdata(&host->dev);
> + struct device_node *node = pbm->op->dev.of_node;
> +
> + pci_of_scan_bus(pbm, node, host->bus);
> +}
> +
> +static struct pci_host_bridge_ops phb_ops = {
> + .scan_bus = pci_host_bridge_of_scan_bus,
> +};
> +
> struct pci_bus *pci_scan_one_pbm(struct pci_pbm_info *pbm,
> struct device *parent)
> {
> LIST_HEAD(resources);
> struct device_node *node = pbm->op->dev.of_node;
> - struct pci_bus *bus;
> + struct pci_host_bridge *host;
>
> printk("PCI: Scanning PBM %s\n", node->full_name);
>
> @@ -667,22 +680,21 @@ struct pci_bus *pci_scan_one_pbm(struct pci_pbm_info *pbm,
> pbm->busn.end = pbm->pci_last_busno;
> pbm->busn.flags = IORESOURCE_BUS;
> pci_add_resource(&resources, &pbm->busn);
> - bus = pci_create_root_bus(parent,
> + host = pci_scan_host_bridge(parent,
> PCI_DOMBUS(pbm->index, pbm->pci_first_busno),
> - pbm->pci_ops, pbm, &resources);
> - if (!bus) {
> - printk(KERN_ERR "Failed to create bus for %s\n",
> + pbm->pci_ops, pbm, &resources, &phb_ops);
> + if (!host) {
> + printk(KERN_ERR "Failed to create host bridge for %s\n",
> node->full_name);
> pci_free_resource_list(&resources);
> return NULL;
> }
>

I would keep "bus" and set it here:

bus = host->bus;

That would remove some lines from your patch that really didn't change,
which makes it easier to see what actually *is* changing, namely, you're
removing the pci_of_scan_bus() call because it is now done inside
pci_scan_host_bridge().

> - pci_of_scan_bus(pbm, node, bus);
> - pci_bus_register_of_sysfs(bus);
> + pci_bus_register_of_sysfs(host->bus);
>
> - pci_claim_bus_resources(bus);
> - pci_bus_add_devices(bus);
> - return bus;
> + pci_claim_bus_resources(host->bus);
> + pci_bus_add_devices(host->bus);
> + return host->bus;
> }
>
> void pcibios_fixup_bus(struct pci_bus *pbus)
> --
> 1.7.1
>


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