linux-kernel - [PATCH 5.4 13/53] lan743x: fix deadlock in lan743x_phy_link_status

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Date:   Mon, 28 Feb 2022 18:24:11 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alessandro B Maurici <abmaurici@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Andrew Lunn <andrew@...n.ch>, Jakub Kicinski <kuba@...nel.org>,
        dann frazier <dann.frazier@...onical.com>
Subject: [PATCH 5.4 13/53] lan743x: fix deadlock in lan743x_phy_link_status_change()

From: Heiner Kallweit <hkallweit1@...il.com>

commit ddb826c2c92d461f290a7bab89e7c28696191875 upstream.

Usage of phy_ethtool_get_link_ksettings() in the link status change
handler isn't needed, and in combination with the referenced change
it results in a deadlock. Simply remove the call and replace it with
direct access to phydev->speed. The duplex argument of
lan743x_phy_update_flowcontrol() isn't used and can be removed.

Fixes: c10a485c3de5 ("phy: phy_ethtool_ksettings_get: Lock the phy for consistency")
Reported-by: Alessandro B Maurici <abmaurici@...il.com>
Tested-by: Alessandro B Maurici <abmaurici@...il.com>
Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
Link: https://lore.kernel.org/r/40e27f76-0ba3-dcef-ee32-a78b9df38b0f@gmail.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
[dannf: adjust context]
Signed-off-by: dann frazier <dann.frazier@...onical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---

---
 drivers/net/ethernet/microchip/lan743x_main.c |   12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

--- a/drivers/net/ethernet/microchip/lan743x_main.c
+++ b/drivers/net/ethernet/microchip/lan743x_main.c
@@ -916,8 +916,7 @@ static int lan743x_phy_reset(struct lan7
 }
 
 static void lan743x_phy_update_flowcontrol(struct lan743x_adapter *adapter,
-					   u8 duplex, u16 local_adv,
-					   u16 remote_adv)
+					   u16 local_adv, u16 remote_adv)
 {
 	struct lan743x_phy *phy = &adapter->phy;
 	u8 cap;
@@ -944,22 +943,17 @@ static void lan743x_phy_link_status_chan
 
 	phy_print_status(phydev);
 	if (phydev->state == PHY_RUNNING) {
-		struct ethtool_link_ksettings ksettings;
 		int remote_advertisement = 0;
 		int local_advertisement = 0;
 
-		memset(&ksettings, 0, sizeof(ksettings));
-		phy_ethtool_get_link_ksettings(netdev, &ksettings);
 		local_advertisement =
 			linkmode_adv_to_mii_adv_t(phydev->advertising);
 		remote_advertisement =
 			linkmode_adv_to_mii_adv_t(phydev->lp_advertising);
 
-		lan743x_phy_update_flowcontrol(adapter,
-					       ksettings.base.duplex,
-					       local_advertisement,
+		lan743x_phy_update_flowcontrol(adapter, local_advertisement,
 					       remote_advertisement);
-		lan743x_ptp_update_latency(adapter, ksettings.base.speed);
+		lan743x_ptp_update_latency(adapter, phydev->speed);
 	}
 }