linux-kernel - [PATCH v1] PCI: dwc: fix a warning about variable 'res' is uninitialized

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Message-Id: <20200717133007.23858-1-zhengdejin5@gmail.com>
Date:   Fri, 17 Jul 2020 21:30:07 +0800
From:   Dejin Zheng <zhengdejin5@...il.com>
To:     m-karicheri2@...com, lorenzo.pieralisi@....com, robh@...nel.org,
        bhelgaas@...gle.com, gustavo.pimentel@...opsys.com,
        linux-pci@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Dejin Zheng <zhengdejin5@...il.com>,
        kernel test robot <lkp@...el.com>
Subject: [PATCH v1] PCI: dwc: fix a warning about variable 'res' is uninitialized

The kernel test robot reported a compile warning,

drivers/pci/controller/dwc/pci-keystone.c:1236:18: warning: variable 'res'
is uninitialized when used here [-Wuninitialized]

The commit c59a7d771134b5 ("PCI: dwc: Convert to
devm_platform_ioremap_resource_byname()") did a wrong conversion for
keystone driver. the commit use devm_platform_ioremap_resource_byname()
to replace platform_get_resource_byname() and devm_ioremap_resource().
but the subsequent code needs to use the variable 'res', which is got by
platform_get_resource_byname() for resource "app". so revert it.

Fixes: c59a7d771134b5 ("PCI: dwc: Convert to devm_platform_ioremap_resource_byname()")
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Dejin Zheng <zhengdejin5@...il.com>
---
 drivers/pci/controller/dwc/pci-keystone.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index 5ffc3b40c4f6..00279002102e 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -1228,8 +1228,8 @@ static int __init ks_pcie_probe(struct platform_device *pdev)
 	if (!pci)
 		return -ENOMEM;
 
-	ks_pcie->va_app_base =
-		devm_platform_ioremap_resource_byname(pdev, "app");
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "app");
+	ks_pcie->va_app_base = devm_ioremap_resource(dev, res);
 	if (IS_ERR(ks_pcie->va_app_base))
 		return PTR_ERR(ks_pcie->va_app_base);
 
-- 
2.25.0