linux-kernel - [PATCH] clk: mediatek: fixed static checker warning in clk_cpumux_get

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Date:   Tue, 11 Jul 2017 10:43:51 +0800
From:   <sean.wang@...iatek.com>
To:     <sboyd@...eaurora.org>, <dan.carpenter@...cle.com>,
        <linux-mediatek@...ts.infradead.org>, <linux-clk@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>, Sean Wang <sean.wang@...iatek.com>
Subject: [PATCH] clk: mediatek: fixed static checker warning in clk_cpumux_get_parent call

From: Sean Wang <sean.wang@...iatek.com>

Fixed the signedness bug returning '(-22)' on the return type as u8 with
moving the sanity checker into clk_cpumux_set_parent() to ensure always
validity in clk_cpumux_get_parent() got called.

Fixes: commit 1e17de9049da ("clk: mediatek: add missing cpu mux causing Mediatek cpufreq can't work")
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Sean Wang <sean.wang@...iatek.com>
---
 drivers/clk/mediatek/clk-cpumux.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/clk/mediatek/clk-cpumux.c b/drivers/clk/mediatek/clk-cpumux.c
index edd8e69..c6a3a1a 100644
--- a/drivers/clk/mediatek/clk-cpumux.c
+++ b/drivers/clk/mediatek/clk-cpumux.c
@@ -27,7 +27,6 @@ static inline struct mtk_clk_cpumux *to_mtk_clk_cpumux(struct clk_hw *_hw)
 static u8 clk_cpumux_get_parent(struct clk_hw *hw)
 {
 	struct mtk_clk_cpumux *mux = to_mtk_clk_cpumux(hw);
-	int num_parents = clk_hw_get_num_parents(hw);
 	unsigned int val;
 
 	regmap_read(mux->regmap, mux->reg, &val);
@@ -35,17 +34,18 @@ static u8 clk_cpumux_get_parent(struct clk_hw *hw)
 	val >>= mux->shift;
 	val &= mux->mask;
 
-	if (val >= num_parents)
-		return -EINVAL;
-
 	return val;
 }
 
 static int clk_cpumux_set_parent(struct clk_hw *hw, u8 index)
 {
 	struct mtk_clk_cpumux *mux = to_mtk_clk_cpumux(hw);
+	int num_parents = clk_hw_get_num_parents(hw);
 	u32 mask, val;
 
+	if (index >= num_parents)
+		return -EINVAL;
+
 	val = index << mux->shift;
 	mask = mux->mask << mux->shift;
 
-- 
2.7.4