linux-kernel - [PATCH net] net: pse-pd: tps23881: Fix boolean evaluation for bitmask checks

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Message-Id: <20240923153427.2135263-1-kory.maincent@bootlin.com>
Date: Mon, 23 Sep 2024 17:34:26 +0200
From: Kory Maincent <kory.maincent@...tlin.com>
To: "Kory Maincent (Dent Project)" <kory.maincent@...tlin.com>,
	Jakub Kicinski <kuba@...nel.org>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Kyle Swenson <kyle.swenson@....tech>,
	thomas.petazzoni@...tlin.com,
	Oleksij Rempel <o.rempel@...gutronix.de>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH net] net: pse-pd: tps23881: Fix boolean evaluation for bitmask checks

Fixed potential incorrect boolean evaluation when checking bitmask values.
The existing code assigned the result of bitwise operations directly to
boolean variables, which could lead to unexpected values.
This has been corrected by explicitly converting the results to booleans
using the !! operator.

Fixes: 20e6d190ffe1 ("net: pse-pd: Add TI TPS23881 PSE controller driver")
Signed-off-by: Kory Maincent <kory.maincent@...tlin.com>
---
 drivers/net/pse-pd/tps23881.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/net/pse-pd/tps23881.c b/drivers/net/pse-pd/tps23881.c
index 5c4e88be46ee..1a57c55f8577 100644
--- a/drivers/net/pse-pd/tps23881.c
+++ b/drivers/net/pse-pd/tps23881.c
@@ -139,9 +139,9 @@ static int tps23881_pi_is_enabled(struct pse_controller_dev *pcdev, int id)
 
 	chan = priv->port[id].chan[0];
 	if (chan < 4)
-		enabled = ret & BIT(chan);
+		enabled = !!(ret & BIT(chan));
 	else
-		enabled = ret & BIT(chan + 4);
+		enabled = !!(ret & BIT(chan + 4));
 
 	if (priv->port[id].is_4p) {
 		chan = priv->port[id].chan[1];
@@ -172,11 +172,11 @@ static int tps23881_ethtool_get_status(struct pse_controller_dev *pcdev,
 
 	chan = priv->port[id].chan[0];
 	if (chan < 4) {
-		enabled = ret & BIT(chan);
-		delivering = ret & BIT(chan + 4);
+		enabled = !!(ret & BIT(chan));
+		delivering = !!(ret & BIT(chan + 4));
 	} else {
-		enabled = ret & BIT(chan + 4);
-		delivering = ret & BIT(chan + 8);
+		enabled = !!(ret & BIT(chan + 4));
+		delivering = !!(ret & BIT(chan + 8));
 	}
 
 	if (priv->port[id].is_4p) {
-- 
2.34.1