From: Jonas Gorski <jonas.gorski@gmail.com>
Date: Tue, 18 Jul 2017 10:17:25 +0000 (+0200)
Subject: m68k: allow NULL clock for clk_get_rate
X-Git-Tag: v5.15~10451^2~1
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=94b282267c2f3af725b154c91275ed374c1f11de;p=platform%2Fkernel%2Flinux-starfive.git

m68k: allow NULL clock for clk_get_rate

Make the behaviour of clk_get_rate consistent with common clk's
clk_get_rate by accepting NULL clocks as parameter. Some device
drivers rely on this, and will cause an OOPS otherwise.

Fixes: facdf0ed4f59 ("m68knommu: introduce basic clk infrastructure")
Cc: Greg Ungerer <gerg@linux-m68k.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: linux-m68k@lists.linux-m68k.org
Cc: linux-kernel@vger.kernel.org
Reported-by: Mathias Kresin <dev@kresin.me>
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Signed-off-by: Greg Ungerer <gerg@linux-m68k.org>
---

diff --git a/arch/m68k/coldfire/clk.c b/arch/m68k/coldfire/clk.c
index 1e3c7e9..856069a 100644
--- a/arch/m68k/coldfire/clk.c
+++ b/arch/m68k/coldfire/clk.c
@@ -121,6 +121,9 @@ EXPORT_SYMBOL(clk_put);
 
 unsigned long clk_get_rate(struct clk *clk)
 {
+	if (!clk)
+		return 0;
+
 	return clk->rate;
 }
 EXPORT_SYMBOL(clk_get_rate);