linux-kernel - [PATCH net-next] net: phy: prevent PHYs w/o Clause 22 regs from calling genphy_config

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Date:   Mon, 23 Jul 2018 18:06:15 +0300
From:   Camelia Groza <camelia.groza@....com>
To:     andrew@...n.ch, f.fainelli@...il.com, rmk+kernel@...linux.org.uk,
        davem@...emloft.net
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Camelia Groza <camelia.groza@....com>
Subject: [PATCH net-next] net: phy: prevent PHYs w/o Clause 22 regs from calling genphy_config_aneg

genphy_config_aneg() should be called only by PHYs that implement
the Clause 22 register set. Prevent Clause 45 PHYs that don't implement
the register set from calling the genphy function.

Signed-off-by: Camelia Groza <camelia.groza@....com>
---
 drivers/net/phy/phy.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index efa0a3c..6049652 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -471,8 +471,14 @@ static int phy_config_aneg(struct phy_device *phydev)
 {
 	if (phydev->drv->config_aneg)
 		return phydev->drv->config_aneg(phydev);
-	else
-		return genphy_config_aneg(phydev);
+
+	/* Clause 45 PHYs that don't implement Clause 22 registers are not
+	 * allowed to call genphy_config_aneg()
+	 */
+	if (phydev->is_c45 && !(phydev->c45_ids.devices_in_package & BIT(0)))
+		return -EOPNOTSUPP;
+
+	return genphy_config_aneg(phydev);
 }
 
 /**
-- 
1.9.1