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Subject[PATCH v3 3/5] pci: Create pci_host_bridge before its associated bus in pci_create_root_bus.
Date
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>

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 6e34498..78ccba0 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 +1726,21 @@ 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) {
+ kfree(bridge);
+ return NULL;
+ }
+
b = pci_alloc_bus();
if (!b)
- return NULL;
+ goto err_out;

b->sysdata = sysdata;
b->ops = ops;
@@ -1738,26 +1749,15 @@ 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 +1814,10 @@ 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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