linux-kernel - [PATCH 9/9] unicore32: allow NULL clock for clk_get

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Message-Id: <20170718101730.2541-10-jonas.gorski@gmail.com>
Date:   Tue, 18 Jul 2017 12:17:30 +0200
From:   Jonas Gorski <jonas.gorski@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Guan Xuetao <gxt@...c.pku.edu.cn>, linux-kernel@...r.kernel.org
Subject: [PATCH 9/9] unicore32: 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: 64909882862e ("unicore32 additional architecture files: pm related files")
Cc: Guan Xuetao <gxt@...c.pku.edu.cn>
Cc: linux-kernel@...r.kernel.org
Reported-by: Mathias Kresin <dev@...sin.me>
Signed-off-by: Jonas Gorski <jonas.gorski@...il.com>
---
 arch/unicore32/kernel/clock.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/unicore32/kernel/clock.c b/arch/unicore32/kernel/clock.c
index b1ca775f6f6e..d867f34fdb74 100644
--- a/arch/unicore32/kernel/clock.c
+++ b/arch/unicore32/kernel/clock.c
@@ -92,6 +92,9 @@ EXPORT_SYMBOL(clk_disable);
 
 unsigned long clk_get_rate(struct clk *clk)
 {
+	if (!clk)
+		return 0;
+
 	return clk->rate;
 }
 EXPORT_SYMBOL(clk_get_rate);
-- 
2.11.0