linux-kernel - [PATCH][next] phy: mvebu-cp110-comphy: fix -ve error return against a u32

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Date:   Thu, 31 Aug 2017 17:43:49 +0100
From:   Colin King <colin.king@...onical.com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Antoine Tenart <antoine.tenart@...e-electrons.com>,
        "David S . Miller" <davem@...emloft.net>
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] phy: mvebu-cp110-comphy: fix -ve error return against a u32

From: Colin Ian King <colin.king@...onical.com>

The check to see if the call to mvebu_comphy_get_mux failed is always
false because mux is a u32 and can never be less than zero. Fix this
by making mux an int and casting to u32 on shift later on.

Detected by CoverityScan, CID#1455220 ("Unsigned compared against 0")

Fixes: d0438bd6aa09 ("phy: add the mvebu cp110 comphy driver")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/phy/marvell/phy-mvebu-cp110-comphy.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/phy/marvell/phy-mvebu-cp110-comphy.c b/drivers/phy/marvell/phy-mvebu-cp110-comphy.c
index 73ebad6634a7..7e21b2a977b9 100644
--- a/drivers/phy/marvell/phy-mvebu-cp110-comphy.c
+++ b/drivers/phy/marvell/phy-mvebu-cp110-comphy.c
@@ -468,8 +468,8 @@ static int mvebu_comphy_power_on(struct phy *phy)
 {
 	struct mvebu_comphy_lane *lane = phy_get_drvdata(phy);
 	struct mvebu_comphy_priv *priv = lane->priv;
-	int ret;
-	u32 mux, val;
+	int ret, mux;
+	u32 val;
 
 	mux = mvebu_comphy_get_mux(lane->id, lane->port, lane->mode);
 	if (mux < 0)
@@ -477,7 +477,7 @@ static int mvebu_comphy_power_on(struct phy *phy)
 
 	regmap_read(priv->regmap, MVEBU_COMPHY_SELECTOR, &val);
 	val &= ~(0xf << MVEBU_COMPHY_SELECTOR_PHY(lane->id));
-	val |= mux << MVEBU_COMPHY_SELECTOR_PHY(lane->id);
+	val |= (u32)mux << MVEBU_COMPHY_SELECTOR_PHY(lane->id);
 	regmap_write(priv->regmap, MVEBU_COMPHY_SELECTOR, val);
 
 	switch (lane->mode) {
-- 
2.14.1