linux-kernel - [PATCH 3.16 090/133] MIPS: Loongson 2F: allow NULL clock for clk_get

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Date:   Wed, 22 Nov 2017 01:58:13 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, linux-mips@...ux-mips.org,
        "Jonas Gorski" <jonas.gorski@...il.com>,
        "Ralf Baechle" <ralf@...ux-mips.org>,
        "Mathias Kresin" <dev@...sin.me>
Subject: [PATCH 3.16 090/133] MIPS: Loongson 2F: allow NULL clock for
 clk_get_rate

3.16.51-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Jonas Gorski <jonas.gorski@...il.com>

commit 386787b1fcab2dd3d16ca3f46729aaafdef306e3 upstream.

Make the behaviour of clk_get_rate consistent with common clk's
clk_get_rate by accepting NULL clocks as parameter, as some device
drivers rely on this.

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: f8ede0f700f5 ("MIPS: Loongson 2F: Add CPU frequency scaling support")
Reported-by: Mathias Kresin <dev@...sin.me>
Signed-off-by: Jonas Gorski <jonas.gorski@...il.com>
Cc: linux-mips@...ux-mips.org
Cc: linux-kernel@...r.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/16777/
Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
[bwh: Backported to 3.16: adjust filename]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/mips/loongson/lemote-2f/clock.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/arch/mips/loongson/lemote-2f/clock.c
+++ b/arch/mips/loongson/lemote-2f/clock.c
@@ -80,6 +80,9 @@ EXPORT_SYMBOL(clk_disable);
 
 unsigned long clk_get_rate(struct clk *clk)
 {
+	if (!clk)
+		return 0;
+
 	return (unsigned long)clk->rate;
 }
 EXPORT_SYMBOL(clk_get_rate);