PCI: rcar: Fix pci_remap_iospace() failure path

On ARM/ARM64 architectures, PCI IO ports are emulated through memory mapped
IO, by reserving a chunk of virtual address space starting at PCI_IOBASE
and by mapping the PCI host bridges memory address space driving PCI IO
cycles to it.

PCI host bridge drivers that enable downstream PCI IO cycles map the host
bridge memory address responding to PCI IO cycles to the fixed virtual
address space through the pci_remap_iospace() API.

This means that if the pci_remap_iospace() function fails, the
corresponding host bridge PCI IO resource must be considered invalid, in
that there is no way for the kernel to actually drive PCI IO transactions
if the memory addresses responding to PCI IO cycles cannot be mapped into
the CPU virtual address space.

The PCI rcar host bridge driver does not remove the PCI IO resource from
the host bridge resource windows if the pci_remap_iospace() call fails;
this is an actual bug in that the PCI host bridge would consider the PCI IO
resource valid (and possibly assign it to downstream devices) even if the
kernel was not able to map the PCI host bridge memory address driving IO
cycle to the CPU virtual address space (ie pci_remap_iospace() failures).

Fix the PCI host bridge driver pci_remap_iospace() failure path, by
destroying the PCI host bridge PCI IO resources retrieved through firmware
when the pci_remap_iospace() function call fails, therefore preventing the
kernel from adding the respective PCI IO resource to the list of PCI host
bridge valid resources, fixing the issue.

Fixes: 5d2917d4 ("PCI: rcar: Convert to DT resource parsing API")
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: Phil Edworthy <phil.edworthy@renesas.com>
CC: Simon Horman <horms+renesas@verge.net.au>

drivers/pci/host/pcie-rcar.c

@@ -945,7 +945,7 @@ static int rcar_pcie_parse_request_of_pci_ranges(struct rcar_pcie *pci)
 	struct device *dev = pci->dev;
 	struct device_node *np = dev->of_node;
 	resource_size_t iobase;
-	struct resource_entry *win;
+	struct resource_entry *win, *tmp;
 
 	err = of_pci_get_host_bridge_resources(np, 0, 0xff, &pci->resources, &iobase);
 	if (err)
@@ -955,14 +955,17 @@ static int rcar_pcie_parse_request_of_pci_ranges(struct rcar_pcie *pci)
 	if (err)
 		goto out_release_res;
 
-	resource_list_for_each_entry(win, &pci->resources) {
+	resource_list_for_each_entry_safe(win, tmp, &pci->resources) {
 		struct resource *res = win->res;
 
 		if (resource_type(res) == IORESOURCE_IO) {
 			err = pci_remap_iospace(res, iobase);
-			if (err)
+			if (err) {
 				dev_warn(dev, "error %d: failed to map resource %pR\n",
 					 err, res);
+
+				resource_list_destroy_entry(win);
+			}
 		}
 	}