netdev - [PATCH net-next] phylink: avoid attaching more than one PHY

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Message-Id: <E1eRni1-0006jr-Q8@rmk-PC.armlinux.org.uk>
Date:   Wed, 20 Dec 2017 23:23:33 +0000
From:   Russell King <rmk+kernel@...linux.org.uk>
To:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org
Subject: [PATCH net-next] phylink: avoid attaching more than one PHY

Attaching more than one PHY to phylink is bad news, as we store a
pointer to the PHY in a single location. Error out if more than one
PHY is attempted to be attached.

Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
---
 drivers/net/phy/phylink.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index db5d5726ced9..82166a26f5c6 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -726,6 +726,9 @@ int phylink_connect_phy(struct phylink *pl, struct phy_device *phy)
 		     phy_interface_mode_is_8023z(pl->link_interface))))
 		return -EINVAL;
 
+	if (pl->phydev)
+		return -EBUSY;
+
 	/* Use PHY device/driver interface */
 	if (pl->link_interface == PHY_INTERFACE_MODE_NA) {
 		pl->link_interface = phy->interface;
-- 
2.7.4