From: 黄涛 <huangtao@rock-chips.com>
Date: Mon, 7 May 2012 12:11:36 +0000 (+0800)
Subject: rk30: clock: clk_get_parent return error when clk invalid
X-Git-Tag: firefly_0821_release~9244
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=fd8103d56ad8b98f28b9a665dd4f3eefd9d90be2;p=firefly-linux-kernel-4.4.55.git

rk30: clock: clk_get_parent return error when clk invalid
---

diff --git a/arch/arm/mach-rk30/clock.c b/arch/arm/mach-rk30/clock.c
index 572e59e2f9ed..6950186b5cf3 100755
--- a/arch/arm/mach-rk30/clock.c
+++ b/arch/arm/mach-rk30/clock.c
@@ -445,6 +445,9 @@ struct clk *rk30_clk_get_parent(struct clk *clk)
 struct clk *clk_get_parent(struct clk *clk)
 #endif
 {
+	if (clk == NULL || IS_ERR(clk)) {
+		return ERR_PTR(-EINVAL);
+	}
 	return clk->parent;
 }