[PATCH 4.18 16/22] PCI: aardvark: Size bridges before resources allocation

[Greg Kroah-Hartman]

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Zachary Zhang <zhangzg@xxxxxxxxxxx>

commit 91a2968e245d6ba616db37001fa1a043078b1a65 upstream.

The PCIE I/O and MEM resource allocation mechanism is that root bus
goes through the following steps:

1. Check PCI bridges' range and computes I/O and Mem base/limits.

2. Sort all subordinate devices I/O and MEM resource requirements and
   allocate the resources and writes/updates subordinate devices'
   requirements to PCI bridges I/O and Mem MEM/limits registers.

Currently, PCI Aardvark driver only handles the second step and lacks
the first step, so there is an I/O and MEM resource allocation failure
when using a PCI switch. This commit fixes that by sizing bridges
before doing the resource allocation.

Fixes: 8c39d710363c1 ("PCI: aardvark: Add Aardvark PCI host controller
driver")
Signed-off-by: Zachary Zhang <zhangzg@xxxxxxxxxxx>
[Thomas: edit commit log.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxx>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/pci/controller/pci-aardvark.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/pci/controller/pci-aardvark.c
+++ b/drivers/pci/controller/pci-aardvark.c
@@ -952,6 +952,7 @@ static int advk_pcie_probe(struct platfo
 
 	bus = bridge->bus;
 
+	pci_bus_size_bridges(bus);
 	pci_bus_assign_resources(bus);
 
 	list_for_each_entry(child, &bus->children, node)