netdev - [PATCH net-next 2/2] net: dsa: mv88e6xxx: Return -ENODEV when C22/C45 not supported

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Message-Id: <20240203-unify-c22-c45-scan-error-handling-v1-2-8aa9fa3c4fca@lunn.ch>
Date: Sat, 03 Feb 2024 14:52:49 -0600
From: Andrew Lunn <andrew@...n.ch>
To: Heiner Kallweit <hkallweit1@...il.com>, 
 Russell King <linux@...linux.org.uk>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Florian Fainelli <f.fainelli@...il.com>, 
 Vladimir Oltean <olteanv@...il.com>
Cc: netdev@...r.kernel.org, Tim Menninger <tmenninger@...estorage.com>, 
 Andrew Lunn <andrew@...n.ch>
Subject: [PATCH net-next 2/2] net: dsa: mv88e6xxx: Return -ENODEV when
 C22/C45 not supported

MDIO bus drivers can return -ENODEV when they know the bus does not
have a device at the given address, e.g. because of hardware
limitation. One such limitation is that the bus does not support C22
or C45 at all. This is more efficient than returning 0xffff, since it
immediately stops the probing on the given address, where as further
reads can be made when 0xffff is returned.

Signed-off-by: Andrew Lunn <andrew@...n.ch>
---
 drivers/net/dsa/mv88e6xxx/chip.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 6eec2e4aa031..ce4e4bdf475d 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -3633,7 +3633,7 @@ static int mv88e6xxx_mdio_read(struct mii_bus *bus, int phy, int reg)
 	int err;

 	if (!chip->info->ops->phy_read)
-		return -EOPNOTSUPP;
+		return -ENODEV;

 	mv88e6xxx_reg_lock(chip);
 	err = chip->info->ops->phy_read(chip, bus, phy, reg, &val);
@@ -3659,7 +3659,7 @@ static int mv88e6xxx_mdio_read_c45(struct mii_bus *bus, int phy, int devad,
 	int err;

 	if (!chip->info->ops->phy_read_c45)
-		return 0xffff;
+		return -ENODEV;

 	mv88e6xxx_reg_lock(chip);
 	err = chip->info->ops->phy_read_c45(chip, bus, phy, devad, reg, &val);

-- 
2.43.0