From b5d6bc90c9129279d363ccbc02ad11e7b657c0b4 Mon Sep 17 00:00:00 2001
From: Jaehoon Chung <jh80.chung@samsung.com>
Date: Mon, 22 Jan 2018 11:28:54 +0900
Subject: [PATCH] PCI: exynos: Fix a potential init_clk_resources NULL pointer dereference
Git-commit: b5d6bc90c9129279d363ccbc02ad11e7b657c0b4
Patch-mainline: v4.16-rc1
References: bsc#1051510

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>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 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;
-- 
2.18.0