PCI: Put pci_dev in device tree as early as possible
We want to put pci_dev structs in the device tree as soon as possible so
for_each_pci_dev() iteration will not miss them, but driver attachment
needs to be delayed until after pci_assign_unassigned_resources() to make
sure all devices have resources assigned first.
This patch moves device registering from pci_bus_add_devices() to
pci_device_add(), which happens earlier, leaving driver attachment in
pci_bus_add_devices().
It also removes unattached child bus handling in pci_bus_add_devices().
That's not needed because child bus via pci_add_new_bus() is already
in parent bus children list.
[bhelgaas: changelog]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 48b35e1..281d90f 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -623,6 +623,7 @@
{
struct pci_bus *child;
int i;
+ int ret;
/*
* Allocate a new bus, and inherit stuff from the parent..
@@ -637,8 +638,7 @@
child->bus_flags = parent->bus_flags;
/* initialize some portions of the bus device, but don't register it
- * now as the parent is not properly set up yet. This device will get
- * registered later in pci_bus_add_devices()
+ * now as the parent is not properly set up yet.
*/
child->dev.class = &pcibus_class;
dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr);
@@ -651,11 +651,14 @@
child->primary = parent->busn_res.start;
child->busn_res.end = 0xff;
- if (!bridge)
- return child;
+ if (!bridge) {
+ child->dev.parent = parent->bridge;
+ goto add_dev;
+ }
child->self = bridge;
child->bridge = get_device(&bridge->dev);
+ child->dev.parent = child->bridge;
pci_set_bus_of_node(child);
pci_set_bus_speed(child);
@@ -666,6 +669,13 @@
}
bridge->subordinate = child;
+add_dev:
+ ret = device_register(&child->dev);
+ WARN_ON(ret < 0);
+
+ /* Create legacy_io and legacy_mem files for this bus */
+ pci_create_legacy_files(child);
+
return child;
}
@@ -1296,6 +1306,8 @@
void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
{
+ int ret;
+
device_initialize(&dev->dev);
dev->dev.release = pci_release_dev;
@@ -1326,6 +1338,17 @@
down_write(&pci_bus_sem);
list_add_tail(&dev->bus_list, &bus->devices);
up_write(&pci_bus_sem);
+
+ pci_fixup_device(pci_fixup_final, dev);
+ ret = pcibios_add_device(dev);
+ WARN_ON(ret < 0);
+
+ /* Notifier could use PCI capabilities */
+ dev->match_driver = false;
+ ret = device_add(&dev->dev);
+ WARN_ON(ret < 0);
+
+ pci_proc_attach_device(dev);
}
struct pci_dev *__ref pci_scan_single_device(struct pci_bus *bus, int devfn)
@@ -1644,13 +1667,13 @@
char bus_addr[64];
char *fmt;
-
b = pci_alloc_bus();
if (!b)
return NULL;
b->sysdata = sysdata;
b->ops = ops;
+ b->number = b->busn_res.start = bus;
b2 = pci_find_bus(pci_domain_nr(b), bus);
if (b2) {
/* If we already got to this bus through a different bridge, ignore it */
@@ -1685,8 +1708,6 @@
/* Create legacy_io and legacy_mem files for this bus */
pci_create_legacy_files(b);
- b->number = b->busn_res.start = bus;
-
if (parent)
dev_info(parent, "PCI host bridge to bus %s\n", dev_name(&b->dev));
else