[PATCH AUTOSEL 5.7 257/388] PCI: dwc: pci-dra7xx: Use devm_platform_ioremap_resource_byname()

Sasha Levin
2020-06-18T02:31:30Z

From: Wei Yongjun <weiyongjun1@huawei.com>

[ Upstream commit c8a119779f5609de8dcd98630f71cc7f1b2e4e8c ]

platform_get_resource() may fail and return NULL, so we had better
check its return value to avoid a NULL pointer dereference a bit later
in the code. Fix it to use devm_platform_ioremap_resource_byname()
instead of calling platform_get_resource_byname() and devm_ioremap().

Link: https://lore.kernel.org/r/20200429015027.134485-1-weiyongjun1@huawei.com
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
[lorenzo.pieralisi@arm.com: commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/pci/controller/dwc/pci-dra7xx.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-dra7xx.c b/drivers/pci/controller/dwc/pci-dra7xx.c
index 3b0e58f2de58..6184ebc9392d 100644
--- a/drivers/pci/controller/dwc/pci-dra7xx.c
+++ b/drivers/pci/controller/dwc/pci-dra7xx.c
@@ -840,7 +840,6 @@ static int __init dra7xx_pcie_probe(struct platform_device *pdev)
struct phy **phy;
struct device_link **link;
void __iomem *base;
- struct resource *res;
struct dw_pcie *pci;
struct dra7xx_pcie *dra7xx;
struct device *dev = &pdev->dev;
@@ -877,10 +876,9 @@ static int __init dra7xx_pcie_probe(struct platform_device *pdev)
return irq;
}

- res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ti_conf");
- base = devm_ioremap(dev, res->start, resource_size(res));
- if (!base)
- return -ENOMEM;
+ base = devm_platform_ioremap_resource_byname(pdev, "ti_conf");
+ if (IS_ERR(base))
+ return PTR_ERR(base);

phy_count = of_property_count_strings(np, "phy-names");
if (phy_count < 0) {
--
2.25.1