PCI: keystone: Don't dereference possible NULL pointer

Check for failure from platform_get_resource() (this check actually happens
inside devm_ioremap_resource()) before dereferencing the pointer returned
from platform_get_resource().

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/pci/host/pci-keystone-dw.c b/drivers/pci/host/pci-keystone-dw.c
index 66d8ea41b972..f34892e0edb4 100644
--- a/drivers/pci/host/pci-keystone-dw.c
+++ b/drivers/pci/host/pci-keystone-dw.c
@@ -496,11 +496,12 @@ int __init ks_dw_pcie_host_init(struct keystone_pcie *ks_pcie,
 
         /* Index 1 is the application reg. space address */
         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-        ks_pcie->app = *res;
         ks_pcie->va_app_base = devm_ioremap_resource(pp->dev, res);
         if (IS_ERR(ks_pcie->va_app_base))
                 return PTR_ERR(ks_pcie->va_app_base);
 
+        ks_pcie->app = *res;
+
         /* Create legacy IRQ domain */
         ks_pcie->legacy_irq_domain =
                         irq_domain_add_linear(ks_pcie->legacy_intc_np,