linux-kernel - [PATCH][netdev-next] mdio: mux: fix an incorrect less than zero error check using a u32

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Date:   Mon,  5 Jun 2017 19:08:04 +0100
From:   Colin King <colin.king@...onical.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][netdev-next] mdio: mux: fix an incorrect less than zero error check using a u32

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

The u32 variable v is being checked to see if an error return is
less than zero and this check has no effect because it is unsigned.
Fix this by making v and int (this also matches the type of
cb->bus_number which is assigned to the value in v).

Detected by CoverityScan, CID#1440454 ("Unsigned compared against zero")

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/net/phy/mdio-mux.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/phy/mdio-mux.c b/drivers/net/phy/mdio-mux.c
index 47ded3904050..00755b6a42cf 100644
--- a/drivers/net/phy/mdio-mux.c
+++ b/drivers/net/phy/mdio-mux.c
@@ -133,7 +133,7 @@ int mdio_mux_init(struct device *dev,
 
 	ret_val = -ENODEV;
 	for_each_available_child_of_node(dev->of_node, child_bus_node) {
-		u32 v;
+		int v;
 
 		v = of_mdio_parse_addr(dev, child_bus_node);
 		if (v < 0) {
-- 
2.11.0