From:   Ameer Hamza <amhamza.mgc@gmail.com>
To:     kabel@kernel.org, kuba@kernel.org, andrew@lunn.ch
Cc:     vivien.didelot@gmail.com, f.fainelli@gmail.com, olteanv@gmail.com,
        davem@davemloft.net, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, amhamza.mgc@gmail.com
Subject: [PATCH v4] net: dsa: mv88e6xxx: error handling for serdes_power functions
Date:   Thu,  9 Dec 2021 09:07:46 +0500
Message-Id: <20211209040746.9299-1-amhamza.mgc@gmail.com>
In-Reply-To: <20211207140647.6926a3e7@thinkpad>
References: <20211207140647.6926a3e7@thinkpad>
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Added default case to handle undefined cmode scenario in
mv88e6393x_serdes_power() and mv88e6393x_serdes_power() methods.

Addresses-Coverity: 1494644 ("Uninitialized scalar variable")
Fixes: 21635d9203e1c (net: mvpp2: fix XDP rx queues registering)
Reviewed-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Ameer Hamza <amhamza.mgc@gmail.com>
---
Changes in v4:
Added fix tag and synced patch with latest repo
---
 drivers/net/dsa/mv88e6xxx/serdes.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/mv88e6xxx/serdes.c b/drivers/net/dsa/mv88e6xxx/serdes.c
index 55273013bfb5..2b05ead515cd 100644
--- a/drivers/net/dsa/mv88e6xxx/serdes.c
+++ b/drivers/net/dsa/mv88e6xxx/serdes.c
@@ -830,7 +830,7 @@ int mv88e6390_serdes_power(struct mv88e6xxx_chip *chip, int port, int lane,
 			   bool up)
 {
 	u8 cmode = chip->ports[port].cmode;
-	int err = 0;
+	int err;
 
 	switch (cmode) {
 	case MV88E6XXX_PORT_STS_CMODE_SGMII:
@@ -842,6 +842,9 @@ int mv88e6390_serdes_power(struct mv88e6xxx_chip *chip, int port, int lane,
 	case MV88E6XXX_PORT_STS_CMODE_RXAUI:
 		err = mv88e6390_serdes_power_10g(chip, lane, up);
 		break;
+	default:
+		err = -EINVAL;
+		break;
 	}
 
 	if (!err && up)
@@ -1541,6 +1544,9 @@ int mv88e6393x_serdes_power(struct mv88e6xxx_chip *chip, int port, int lane,
 	case MV88E6393X_PORT_STS_CMODE_10GBASER:
 		err = mv88e6390_serdes_power_10g(chip, lane, on);
 		break;
+	default:
+		err = -EINVAL;
+		break;
 	}
 
 	if (err)
-- 
2.25.1