Re: [RFC PATCH v2, part 2 01/18] PCI: introduce hotplug-safe PCI bus iterators

[Yinghai Lu <yinghai@kernel.org>]

On Tue, May 14, 2013 at 9:51 AM, Jiang Liu <liuj97@gmail.com> wrote:
> Introduce hotplug-safe PCI bus iterators as below, which hold a
> reference on the returned PCI bus object.
> bool pci_bus_exists(int domain, int busnr);
> struct pci_bus *pci_get_bus(int domain, int busnr);
> struct pci_bus *pci_get_next_bus(struct pci_bus *from);
> struct pci_bus *pci_get_next_root_bus(struct pci_bus *from);
> #define for_each_pci_bus(b) for (b = NULL; (b = pci_get_next_bus(b)); )
> #define for_each_pci_root_bus(b)  \
>                 for (b = NULL; (b = pci_get_next_root_bus(b)); )
>
> The long-term goal is to remove hotplug-unsafe pci_find_bus(),
> pci_find_next_bus() and the global pci_root_buses list.
>
> These new interfaces may be a littler slower than existing interfaces,
> but it should be acceptable because they are not used on hot paths.
>
> Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
> Cc: linux-pci@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org

Acked-by: Yinghai Lu <yinghai@kernel.org>