[PATCH net-next v3 7/7] net: phy: smsc: Cope with hot-removal in interrupt handler

From: Lukas Wunner <lukas@wunner.de>
To: "David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	Eric Dumazet <edumazet@google.com>
Cc: netdev@vger.kernel.org, linux-usb@vger.kernel.org,
	Steve Glendinning <steve.glendinning@shawell.net>,
	UNGLinuxDriver@microchip.com, Oliver Neukum <oneukum@suse.com>,
	Andre Edich <andre.edich@microchip.com>,
	Oleksij Rempel <linux@rempel-privat.de>,
	Martyn Welch <martyn.welch@collabora.com>,
	Gabriel Hojda <ghojda@yo2urs.ro>,
	Christoph Fritz <chf.fritz@googlemail.com>,
	Lino Sanfilippo <LinoSanfilippo@gmx.de>,
	Philipp Rosenberger <p.rosenberger@kunbus.com>,
	Heiner Kallweit <hkallweit1@gmail.com>,
	Andrew Lunn <andrew@lunn.ch>,
	Russell King <linux@armlinux.org.uk>,
	Ferry Toth <fntoth@gmail.com>
Subject: [PATCH net-next v3 7/7] net: phy: smsc: Cope with hot-removal in interrupt handler
Date: Thu, 12 May 2022 10:42:07 +0200	[thread overview]
Message-ID: <4a90661372af73e056f7b243df9c039945715a3b.1652343655.git.lukas@wunner.de> (raw)
In-Reply-To: <cover.1652343655.git.lukas@wunner.de>

If reading the Interrupt Source Flag register fails with -ENODEV, then
the PHY has been hot-removed and the correct response is to bail out
instead of throwing a WARN splat and attempting to suspend the PHY.
The PHY should be stopped in due course anyway as the kernel
asynchronously tears down the device.

Tested-by: Oleksij Rempel <o.rempel@pengutronix.de> # LAN9514/9512/9500
Tested-by: Ferry Toth <fntoth@gmail.com> # LAN9514
Signed-off-by: Lukas Wunner <lukas@wunner.de>
---
 drivers/net/phy/smsc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/smsc.c b/drivers/net/phy/smsc.c
index e0eadea4b4b5..1b54684b68a0 100644
--- a/drivers/net/phy/smsc.c
+++ b/drivers/net/phy/smsc.c
@@ -91,7 +91,9 @@ static irqreturn_t smsc_phy_handle_interrupt(struct phy_device *phydev)
 
 	irq_status = phy_read(phydev, MII_LAN83C185_ISF);
 	if (irq_status < 0) {
-		phy_error(phydev);
+		if (irq_status != -ENODEV)
+			phy_error(phydev);
+
 		return IRQ_NONE;
 	}
 
-- 
2.35.2

