PCI: exynos: Fix a potential init_clk_resources NULL pointer dereference

In order to avoid triggering a NULL pointer dereference in
exynos_pcie_probe() a check must be put in place to detect if
the init_clk_resources hook is initialized before calling it.

Add the respective function pointer check in exynos_pcie_probe().

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
[lorenzo.pieralisi@arm.com: rewrote the commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

diff --git a/drivers/pci/dwc/pci-exynos.c b/drivers/pci/dwc/pci-exynos.c
index 56f32ae..39f0888 100644 (file)
--- a/drivers/pci/dwc/pci-exynos.c
+++ b/drivers/pci/dwc/pci-exynos.c
@@ -499,7 +499,8 @@ static int __init exynos_pcie_probe(struct platform_device *pdev)
                        return ret;
        }
 
-       if (ep->ops && ep->ops->get_clk_resources) {
+       if (ep->ops && ep->ops->get_clk_resources &&
+                       ep->ops->init_clk_resources) {
                ret = ep->ops->get_clk_resources(ep);
                if (ret)
                        return ret;