netdev - [PATCH net-next 4/4] net: phylink: explicitly invalidate link_state members in mac

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Message-Id: <E1qMoP0-000hhX-BQ@rmk-PC.armlinux.org.uk>
Date: Fri, 21 Jul 2023 12:34:30 +0100
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Daniel Golle <daniel@...rotopia.org>,
	 Ar__n__ __NAL <arinc.unal@...nc9.com>,
	 Frank Wunderlich <frank-w@...lic-files.de>,
	 David Woodhouse <dwmw@...zon.co.uk>
Cc: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Felix Fietkau <nbd@....name>,
	Jakub Kicinski <kuba@...nel.org>,
	John Crispin <john@...ozen.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	Mark Lee <Mark-MC.Lee@...iatek.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	netdev@...r.kernel.org,
	Paolo Abeni <pabeni@...hat.com>,
	Sean Wang <sean.wang@...iatek.com>
Subject: [PATCH net-next 4/4] net: phylink: explicitly invalidate link_state
 members in mac_config

Explicitly invalidate the phylink_link_state structure members in
mac_config that do not contain reliable information for this function,
thereby preventing their future incorrect use.

Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 drivers/net/phy/phylink.c | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index df413fb15088..4f1c8bb199e9 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -1066,17 +1066,24 @@ static void phylink_pcs_poll_start(struct phylink *pl)
 static void phylink_mac_config(struct phylink *pl,
 			       const struct phylink_link_state *state)
 {
+	struct phylink_link_state st = *state;
+
+	/* Stop drivers incorrectly using these */
+	linkmode_zero(st.lp_advertising);
+	st.speed = SPEED_UNKNOWN;
+	st.duplex = DUPLEX_UNKNOWN;
+	st.an_complete = false;
+	st.link = false;
+
 	phylink_dbg(pl,
-		    "%s: mode=%s/%s/%s/%s/%s adv=%*pb pause=%02x link=%u\n",
+		    "%s: mode=%s/%s/%s adv=%*pb pause=%02x\n",
 		    __func__, phylink_an_mode_str(pl->cur_link_an_mode),
-		    phy_modes(state->interface),
-		    phy_speed_to_str(state->speed),
-		    phy_duplex_to_str(state->duplex),
-		    phy_rate_matching_to_str(state->rate_matching),
-		    __ETHTOOL_LINK_MODE_MASK_NBITS, state->advertising,
-		    state->pause, state->link);
-
-	pl->mac_ops->mac_config(pl->config, pl->cur_link_an_mode, state);
+		    phy_modes(st.interface),
+		    phy_rate_matching_to_str(st.rate_matching),
+		    __ETHTOOL_LINK_MODE_MASK_NBITS, st.advertising,
+		    st.pause);
+
+	pl->mac_ops->mac_config(pl->config, pl->cur_link_an_mode, &st);
 }
 
 static void phylink_pcs_an_restart(struct phylink *pl)
-- 
2.30.2