linux-kernel - [PATCH 1/2] clk: Don't dereference parent clock if is NULL

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Message-Id: <1423649612-31746-2-git-send-email-javier.martinez@collabora.co.uk>
Date:	Wed, 11 Feb 2015 11:13:30 +0100
From:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
To:	Mike Turquette <mturquette@...aro.org>
Cc:	Stephen Boyd <sboyd@...eaurora.org>,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	Emilio López <emilio@...pez.com.ar>,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Subject: [PATCH 1/2] clk: Don't dereference parent clock if is NULL

The clock passed as an argument to clk_mux_determine_rate_flags() can
not have a parent clock if is either a root clock or an orphan.

In those cases parent is NULL so parent->hw shouldn't be dereferenced.

Fixes: 035a61c314eb3 ("clk: Make clk API return per-user struct clk instances")
Signed-off-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
---
 drivers/clk/clk.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 7f53166af5e6..7bd8893c94d6 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -799,7 +799,7 @@ clk_mux_determine_rate_flags(struct clk_hw *hw, unsigned long rate,
 	/* if NO_REPARENT flag set, pass through to current parent */
 	if (core->flags & CLK_SET_RATE_NO_REPARENT) {
 		parent = core->parent;
-		if (core->flags & CLK_SET_RATE_PARENT)
+		if (core->flags & CLK_SET_RATE_PARENT && parent)
 			best = __clk_determine_rate(parent->hw, rate,
 						    min_rate, max_rate);
 		else if (parent)
-- 
2.1.3

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