linux-kernel - [PATCH 3.16 088/133] MIPS: AR7: 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,
        "Paul Gortmaker" <paul.gortmaker@...driver.com>,
        "Mathias Kresin" <dev@...sin.me>,
        "James Hogan" <james.hogan@...tec.com>,
        "Ralf Baechle" <ralf@...ux-mips.org>, linux-mips@...ux-mips.org,
        "Jonas Gorski" <jonas.gorski@...il.com>
Subject: [PATCH 3.16 088/133] MIPS: AR7: 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 585e0e9d02a690c29932b2fc0789835c7b91d448 upstream.

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: 780019ddf02f ("MIPS: AR7: Implement clock API")
Signed-off-by: Jonas Gorski <jonas.gorski@...il.com>
Reported-by: Mathias Kresin <dev@...sin.me>
Cc: Paul Gortmaker <paul.gortmaker@...driver.com>
Cc: James Hogan <james.hogan@...tec.com>
Cc: linux-mips@...ux-mips.org
Cc: linux-kernel@...r.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/16775/
Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/mips/ar7/clock.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/arch/mips/ar7/clock.c
+++ b/arch/mips/ar7/clock.c
@@ -430,6 +430,9 @@ EXPORT_SYMBOL(clk_disable);
 
 unsigned long clk_get_rate(struct clk *clk)
 {
+	if (!clk)
+		return 0;
+
 	return clk->rate;
 }
 EXPORT_SYMBOL(clk_get_rate);