6.6-stable review patch. If anyone has any objections, please let me know.
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From: Choong Yong Liang yong.liang.choong@linux.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@armlinux.org.uk Signed-off-by: Choong Yong Liang yong.liang.choong@linux.intel.com Link: https://patch.msgid.link/20250227121522.1802832-2-yong.liang.choong@linux.in... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.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 b5f012619e42d..800e8b9eb4532 100644 --- a/drivers/net/phy/phylink.c +++ b/drivers/net/phy/phylink.c @@ -1718,7 +1718,7 @@ 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; }