linux-kernel - [PATCH AUTOSEL 6.12 193/486] net: phylink: use pl->link_interface in phylink_expects

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Message-Id: <20250505223922.2682012-193-sashal@kernel.org>
Date: Mon,  5 May 2025 18:34:29 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Choong Yong Liang <yong.liang.choong@...ux.intel.com>,
	Russell King <rmk+kernel@...linux.org.uk>,
	Jakub Kicinski <kuba@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	linux@...linux.org.uk,
	andrew@...n.ch,
	hkallweit1@...il.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	pabeni@...hat.com,
	netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 6.12 193/486] net: phylink: use pl->link_interface in phylink_expects_phy()

From: Choong Yong Liang <yong.liang.choong@...ux.intel.com>

[ Upstream commit b63263555eaafbf9ab1a82f2020bbee872d83759 ]

The phylink_expects_phy() function allows MAC drivers to check if they are
expecting a PHY to attach. The checking condition in phylink_expects_phy()
aims to achieve the same result as the checking condition in
phylink_attach_phy().

However, the checking condition in phylink_expects_phy() uses
pl->link_config.interface, while phylink_attach_phy() uses
pl->link_interface.

Initially, both pl->link_interface and pl->link_config.interface are set
to SGMII, and pl->cfg_link_an_mode is set to MLO_AN_INBAND.

When the interface switches from SGMII to 2500BASE-X,
pl->link_config.interface is updated by phylink_major_config().
At this point, pl->cfg_link_an_mode remains MLO_AN_INBAND, and
pl->link_config.interface is set to 2500BASE-X.
Subsequently, when the STMMAC interface is taken down
administratively and brought back up, it is blocked by
phylink_expects_phy().

Since phylink_expects_phy() and phylink_attach_phy() aim to achieve the
same result, phylink_expects_phy() should check pl->link_interface,
which never changes, instead of pl->link_config.interface, which is
updated by phylink_major_config().

Reviewed-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
Signed-off-by: Choong Yong Liang <yong.liang.choong@...ux.intel.com>
Link: https://patch.msgid.link/20250227121522.1802832-2-yong.liang.choong@linux.intel.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/phy/phylink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/phy/phylink.c b/drivers/net/phy/phylink.c
index 3e9957b6aa148..b78dfcbec936c 100644
--- a/drivers/net/phy/phylink.c
+++ b/drivers/net/phy/phylink.c
@@ -1811,7 +1811,7 @@ bool phylink_expects_phy(struct phylink *pl)
 {
 	if (pl->cfg_link_an_mode == MLO_AN_FIXED ||
 	    (pl->cfg_link_an_mode == MLO_AN_INBAND &&
-	     phy_interface_mode_is_8023z(pl->link_config.interface)))
+	     phy_interface_mode_is_8023z(pl->link_interface)))
 		return false;
 	return true;
 }
-- 
2.39.5