Re: [PATCH v6 3/6] pci: Create pci_host_bridge before its associated bus in pci_create_root_bus.

Grant Likely
2014-03-08T05:31:54Z

On Wed, 5 Mar 2014 11:48:54 +0000, Liviu Dudau <Liviu.Dudau@arm.com> wrote:
> Before commit 7b5436635800 the pci_host_bridge was created before the root bus.
> As that commit has added a needless dependency on the bus for pci_alloc_host_bridge()
> the creation order has been changed for no good reason. Revert the order of
> creation as we are going to depend on the pci_host_bridge structure to retrieve the
> domain number of the root bus.
>
> Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
> Tested-by: Tanmay Inamdar <tinamdar@apm.com>

Acked-by: Grant Likely <grant.likely@linaro.org>

> ---
> drivers/pci/probe.c | 36 ++++++++++++++++++------------------
> 1 file changed, 18 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 6e34498..fd11c12 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -505,7 +505,7 @@ static void pci_release_host_bridge_dev(struct device *dev)
> kfree(bridge);
> }
>
> -static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b)
> +static struct pci_host_bridge *pci_alloc_host_bridge(void)
> {
> struct pci_host_bridge *bridge;
>
> @@ -514,7 +514,6 @@ static struct pci_host_bridge *pci_alloc_host_bridge(struct pci_bus *b)
> return NULL;
>
> INIT_LIST_HEAD(&bridge->windows);
> - bridge->bus = b;
> return bridge;
> }
>
> @@ -1727,9 +1726,19 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
> char bus_addr[64];
> char *fmt;
>
> + bridge = pci_alloc_host_bridge();
> + if (!bridge)
> + return NULL;
> +
> + bridge->dev.parent = parent;
> + bridge->dev.release = pci_release_host_bridge_dev;
> + error = pcibios_root_bridge_prepare(bridge);
> + if (error)
> + goto err_out;
> +
> b = pci_alloc_bus();
> if (!b)
> - return NULL;
> + goto err_out;
>
> b->sysdata = sysdata;
> b->ops = ops;
> @@ -1738,26 +1747,15 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
> if (b2) {
> /* If we already got to this bus through a different bridge, ignore it */
> dev_dbg(&b2->dev, "bus already known\n");
> - goto err_out;
> + goto err_bus_out;
> }
>
> - bridge = pci_alloc_host_bridge(b);
> - if (!bridge)
> - goto err_out;
> -
> - bridge->dev.parent = parent;
> - bridge->dev.release = pci_release_host_bridge_dev;
> + bridge->bus = b;
> dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus);
> - error = pcibios_root_bridge_prepare(bridge);
> - if (error) {
> - kfree(bridge);
> - goto err_out;
> - }
> -
> error = device_register(&bridge->dev);
> if (error) {
> put_device(&bridge->dev);
> - goto err_out;
> + goto err_bus_out;
> }
> b->bridge = get_device(&bridge->dev);
> device_enable_async_suspend(b->bridge);
> @@ -1814,8 +1812,10 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
> class_dev_reg_err:
> put_device(&bridge->dev);
> device_unregister(&bridge->dev);
> -err_out:
> +err_bus_out:
> kfree(b);
> +err_out:
> + kfree(bridge);
> return NULL;
> }
>
> --
> 1.9.0
>
>
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