[PATCH 5.12 035/677] PCI: xgene: Fix cfg resource mapping

[Greg Kroah-Hartman]

From: Dejin Zheng <zhengdejin5@xxxxxxxxx>

commit d4707d79fae08c8996a1ba45965a491045a22dda upstream.

In commit e2dcd20b1645 a change was made to use
devm_platform_ioremap_resource_byname() to simplify code and remove
the res variable; this was wrong since the res variable is still needed
and as an outcome the port->cfg_addr gets an erroneous address.

Revert the change going back to original behaviour.

Link: https://lore.kernel.org/r/20210328144118.305074-1-zhengdejin5@xxxxxxxxx
Fixes: e2dcd20b1645a ("PCI: controller: Convert to devm_platform_ioremap_resource_byname()")
Reported-by: dann.frazier@xxxxxxxxxxxxx
Tested-by: dann frazier <dann.frazier@xxxxxxxxxxxxx>
Signed-off-by: Dejin Zheng <zhengdejin5@xxxxxxxxx>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx    # v5.9+
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/pci/controller/pci-xgene.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/pci/controller/pci-xgene.c
+++ b/drivers/pci/controller/pci-xgene.c
@@ -354,7 +354,8 @@ static int xgene_pcie_map_reg(struct xge
 	if (IS_ERR(port->csr_base))
 		return PTR_ERR(port->csr_base);
 
-	port->cfg_base = devm_platform_ioremap_resource_byname(pdev, "cfg");
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
+	port->cfg_base = devm_ioremap_resource(dev, res);
 	if (IS_ERR(port->cfg_base))
 		return PTR_ERR(port->cfg_base);
 	port->cfg_addr = res->start;