[PATCH] PCI: exynos: fix the potential null pointer dereference

[Jaehoon Chung]

Before calling the callback function, it needs to check whether
init_clk_resources is assigned or not.
Otherwise, it can be occurred the NULL pointer dereference when
init_clk_resources is not assigned.

Even though init_clk_resources is assigned now, it needs to prevent the
potential NULL pointer dereference in future.

Signed-off-by: Jaehoon Chung <jh80.chung at samsung.com>
---
 drivers/pci/dwc/pci-exynos.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/dwc/pci-exynos.c b/drivers/pci/dwc/pci-exynos.c
index 56f32aeebd0a..39f08881f9a4 100644
--- 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;
-- 
2.15.1