On Mon, Aug 15, 2016 at 05:36:45PM +0200, Thierry Reding wrote:
> From: Thierry Reding <treding@xxxxxxxxxx>
>
> Provide a way to allocate driver-specific data along with a PCI host
> bridge structure. The bridge's ->private field points to this data.
>
> Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
> ---
> drivers/pci/probe.c | 9 ++++++---
> include/linux/pci.h | 1 +
> 2 files changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 93583b389058..ecf543014da3 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -521,16 +521,19 @@ static void pci_release_host_bridge_dev(struct device *dev)
> kfree(bridge);
> }
>
> -static struct pci_host_bridge *pci_alloc_host_bridge(void)
> +static struct pci_host_bridge *pci_alloc_host_bridge(size_t priv)
> {
> struct pci_host_bridge *bridge;
>
> - bridge = kzalloc(sizeof(*bridge), GFP_KERNEL);
> + bridge = kzalloc(sizeof(*bridge) + priv, GFP_KERNEL);
> if (!bridge)
> return NULL;
>
> INIT_LIST_HEAD(&bridge->windows);
>
> + if (priv)
> + bridge->private = &bridge[1];
How about making private a zero length array ?
Lorenzo
> +
> return bridge;
> }
>
> @@ -2249,7 +2252,7 @@ static struct pci_bus *pci_create_root_bus_msi(struct device *parent,
> int error;
> struct pci_host_bridge *bridge;
>
> - bridge = pci_alloc_host_bridge();
> + bridge = pci_alloc_host_bridge(0);
> if (!bridge)
> return NULL;
>
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index ccf298fad9e7..3aa7240800c8 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -421,6 +421,7 @@ struct pci_host_bridge {
> resource_size_t start,
> resource_size_t size,
> resource_size_t align);
> + void *private;
> };
>
> #define to_pci_host_bridge(n) container_of(n, struct pci_host_bridge, dev)
> --
> 2.9.0
>
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