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PCI: Assign resources for hot-added host bridge more aggressively 

When hot-adding an ACPI host bridge, use
pci_assign_unassigned_root_bus_resources() instead of
pci_assign_unassigned_bus_resources().

The former is more aggressive and will release and reassign existing
resources if necessary.  This is safe at hot-add time because no drivers
are bound to devices below the new host bridge yet.

[bhelgaas: changelog, split __init changes out for reviewability]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Yinghai Lu 2013-07-22 14:37:18 -07:00 committed by Bjorn Helgaas
parent ff35147cf1
commit 39772038ea
3 changed files with 3 additions and 2 deletions
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2
drivers/acpi/pci_root.c
View File

@ -526,7 +526,7 @@ static int acpi_pci_root_add(struct acpi_device *device,
if (system_state != SYSTEM_BOOTING) {
pcibios_resource_survey_bus(root->bus);
pci_assign_unassigned_bus_resources(root->bus);
pci_assign_unassigned_root_bus_resources(root->bus);
}
pci_bus_add_devices(root->bus);

2
drivers/pci/setup-bus.c
View File

@ -1395,7 +1395,7 @@ static enum enable_type pci_realloc_detect(struct pci_bus *bus,
* second and later try will clear small leaf bridge res
* will stop till to the max deepth if can not find good one
*/
static void pci_assign_unassigned_root_bus_resources(struct pci_bus *bus)
void pci_assign_unassigned_root_bus_resources(struct pci_bus *bus)
{
LIST_HEAD(realloc_head); /* list of resources that
want additional resources */

1
include/linux/pci.h
View File

@ -1003,6 +1003,7 @@ int pci_claim_resource(struct pci_dev *, int);
void pci_assign_unassigned_resources(void);
void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge);
void pci_assign_unassigned_bus_resources(struct pci_bus *bus);
void pci_assign_unassigned_root_bus_resources(struct pci_bus *bus);
void pdev_enable_device(struct pci_dev *);
int pci_enable_resources(struct pci_dev *, int mask);
void pci_fixup_irqs(u8 (*)(struct pci_dev *, u8 *),