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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, dann.frazier@canonical.com,
        Dejin Zheng <zhengdejin5@gmail.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Subject: [PATCH 5.10 030/530] PCI: xgene: Fix cfg resource mapping
Date:   Wed, 12 May 2021 16:42:20 +0200
Message-Id: <20210512144820.718490956@linuxfoundation.org>
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From: Dejin Zheng <zhengdejin5@gmail.com>

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@gmail.com
Fixes: e2dcd20b1645a ("PCI: controller: Convert to devm_platform_ioremap_resource_byname()")
Reported-by: dann.frazier@canonical.com
Tested-by: dann frazier <dann.frazier@canonical.com>
Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: stable@vger.kernel.org    # v5.9+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 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
@@ -355,7 +355,8 @@ 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;