On Wed, 2013-05-15 at 00:51 +0800, Jiang Liu wrote:
> Enhance PPC architecture specific code to use hotplug-safe iterators
> to walk PCI buses.
I was about to ack it but then I saw:
> diff --git a/arch/powerpc/kernel/pci_64.c b/arch/powerpc/kernel/pci_64.c
> index 51a133a..a41c6dd 100644
> --- a/arch/powerpc/kernel/pci_64.c
> +++ b/arch/powerpc/kernel/pci_64.c
> @@ -208,7 +208,6 @@ long sys_pciconfig_iobase(long which, unsigned long in_bus,
> unsigned long in_devfn)
> {
> struct pci_controller* hose;
> - struct list_head *ln;
> struct pci_bus *bus = NULL;
> struct device_node *hose_node;
>
> @@ -229,18 +228,16 @@ long sys_pciconfig_iobase(long which, unsigned long in_bus,
> /* That syscall isn't quite compatible with PCI domains, but it's
> * used on pre-domains setup. We return the first match
> */
> -
> - for (ln = pci_root_buses.next; ln != &pci_root_buses; ln = ln->next) {
> - bus = pci_bus_b(ln);
> - if (in_bus >= bus->number && in_bus <= bus->busn_res.end)
> + for_each_pci_root_bus(bus)
> + if (in_bus >= bus->number && in_bus <= bus->busn_res.end &&
> + bus->dev.of_node)
> break;
> - bus = NULL;
> - }
> - if (bus == NULL || bus->dev.of_node == NULL)
> + if (bus == NULL)
> return -ENODEV;
You just removed the NULL check for the of_node field...
> hose_node = bus->dev.of_node;
> hose = PCI_DN(hose_node)->phb;
Which is dereferrenced here.
> + pci_bus_put(bus);
On the other hand, the whole thing can probably be using
pci_bus_to_host() instead.... the above code is bitrotted.
> switch (which) {
> case IOBASE_BRIDGE_NUMBER:
Cheeers,
Ben.
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