linux-kernel - [PATCH 3.16 089/133] MIPS: BCM63XX: 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, "Mathias Kresin" <dev@...sin.me>,
        linux-mips@...ux-mips.org, "Jonas Gorski" <jonas.gorski@...il.com>,
        "Ralf Baechle" <ralf@...ux-mips.org>,
        bcm-kernel-feedback-list@...adcom.com,
        "Florian Fainelli" <f.fainelli@...il.com>,
        "James Hogan" <james.hogan@...tec.com>
Subject: [PATCH 3.16 089/133] MIPS: BCM63XX: 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 1b495faec231980b6c719994b24044ccc04ae06c 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: e7300d04bd08 ("MIPS: BCM63xx: Add support for the Broadcom BCM63xx family of SOCs.")
Reported-by: Mathias Kresin <dev@...sin.me>
Signed-off-by: Jonas Gorski <jonas.gorski@...il.com>
Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
Cc: bcm-kernel-feedback-list@...adcom.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/16776/
Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 arch/mips/bcm63xx/clk.c | 3 +++
 1 file changed, 3 insertions(+)

--- a/arch/mips/bcm63xx/clk.c
+++ b/arch/mips/bcm63xx/clk.c
@@ -335,6 +335,9 @@ EXPORT_SYMBOL(clk_disable);
 
 unsigned long clk_get_rate(struct clk *clk)
 {
+	if (!clk)
+		return 0;
+
 	return clk->rate;
 }