[PATCH v2] PCI: mvebu: Fix duplicate resource requests

[Rob Herring]

With commit 669cbc708122 ("PCI: Move DT resource setup into
devm_pci_alloc_host_bridge()"), the DT 'ranges' is parsed and populated
into resources when the host bridge is allocated. The resources are
requested as well, but that happens a 2nd time for the mvebu driver in
mvebu_pcie_parse_request_resources(). We should only be requesting the
additional resources added in mvebu_pcie_parse_request_resources().
These are not added by default because the use custom properties rather
than standard DT address translation.

Also, the bus ranges was also populated by default, so we can remove
it from mvebu_pci_host_probe().

Fixes: 669cbc708122 ("PCI: Move DT resource setup into devm_pci_alloc_host_bridge()")
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=209729
Reported-by: vtolkm at googlemail.com
Cc: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
Cc: Jason Cooper <jason at lakedaemon.net>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi at arm.com>
Cc: Bjorn Helgaas <bhelgaas at google.com>
Cc: Russell King <linux at armlinux.org.uk>
Cc: linux-pci at vger.kernel.org
Cc: linux-arm-kernel at lists.infradead.org
Signed-off-by: Rob Herring <robh at kernel.org>
---
v2:
 - Fix copy-n-paste error with ioport_resource
---
 drivers/pci/controller/pci-mvebu.c | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
index c39978b750ec..653c0b3d2912 100644
--- a/drivers/pci/controller/pci-mvebu.c
+++ b/drivers/pci/controller/pci-mvebu.c
@@ -960,25 +960,16 @@ static void mvebu_pcie_powerdown(struct mvebu_pcie_port *port)
 }
 
 /*
- * We can't use devm_of_pci_get_host_bridge_resources() because we
- * need to parse our special DT properties encoding the MEM and IO
- * apertures.
+ * devm_of_pci_get_host_bridge_resources() only sets up translateable resources,
+ * so we need extra resource setup parsing our special DT properties encoding
+ * the MEM and IO apertures.
  */
 static int mvebu_pcie_parse_request_resources(struct mvebu_pcie *pcie)
 {
 	struct device *dev = &pcie->pdev->dev;
-	struct device_node *np = dev->of_node;
 	struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
 	int ret;
 
-	/* Get the bus range */
-	ret = of_pci_parse_bus_range(np, &pcie->busn);
-	if (ret) {
-		dev_err(dev, "failed to parse bus-range property: %d\n", ret);
-		return ret;
-	}
-	pci_add_resource(&bridge->windows, &pcie->busn);
-
 	/* Get the PCIe memory aperture */
 	mvebu_mbus_get_pcie_mem_aperture(&pcie->mem);
 	if (resource_size(&pcie->mem) == 0) {
@@ -988,6 +979,9 @@ static int mvebu_pcie_parse_request_resources(struct mvebu_pcie *pcie)
 
 	pcie->mem.name = "PCI MEM";
 	pci_add_resource(&bridge->windows, &pcie->mem);
+	ret = devm_request_resource(dev, &iomem_resource, &pcie->mem);
+	if (ret)
+		return ret;
 
 	/* Get the PCIe IO aperture */
 	mvebu_mbus_get_pcie_io_aperture(&pcie->io);
@@ -1001,9 +995,12 @@ static int mvebu_pcie_parse_request_resources(struct mvebu_pcie *pcie)
 		pcie->realio.name = "PCI I/O";
 
 		pci_add_resource(&bridge->windows, &pcie->realio);
+		ret = devm_request_resource(dev, &ioport_resource, &pcie->realio);
+		if (ret)
+			return ret;
 	}
 
-	return devm_request_pci_bus_resources(dev, &bridge->windows);
+	return 0;
 }
 
 /*
-- 
2.25.1