[PATCH 5.11 426/601] net: phy: lan87xx: fix access to wrong register of LAN87xx

Greg Kroah-Hartman
2021-05-12T17:41:53Z

From: Andre Edich <andre.edich@microchip.com>

[ Upstream commit fdb5cc6ab3b6a1c0122d3644a63ef9dc7a610d35 ]

The function lan87xx_config_aneg_ext was introduced to configure
LAN95xxA but as well writes to undocumented register of LAN87xx.
This fix prevents that access.

The function lan87xx_config_aneg_ext gets more suitable for the new
behavior name.

Reported-by: Måns Rullgård <mans@mansr.com>
Fixes: 05b35e7eb9a1 ("smsc95xx: add phylib support")
Signed-off-by: Andre Edich <andre.edich@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/phy/smsc.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/phy/smsc.c b/drivers/net/phy/smsc.c
index ddb78fb4d6dc..d8cac02a79b9 100644
--- a/drivers/net/phy/smsc.c
+++ b/drivers/net/phy/smsc.c
@@ -185,10 +185,13 @@ static int lan87xx_config_aneg(struct phy_device *phydev)
return genphy_config_aneg(phydev);
}

-static int lan87xx_config_aneg_ext(struct phy_device *phydev)
+static int lan95xx_config_aneg_ext(struct phy_device *phydev)
{
int rc;

+ if (phydev->phy_id != 0x0007c0f0) /* not (LAN9500A or LAN9505A) */
+ return lan87xx_config_aneg(phydev);
+
/* Extend Manual AutoMDIX timer */
rc = phy_read(phydev, PHY_EDPD_CONFIG);
if (rc < 0)
@@ -441,7 +444,7 @@ static struct phy_driver smsc_phy_driver[] = {
.read_status = lan87xx_read_status,
.config_init = smsc_phy_config_init,
.soft_reset = smsc_phy_reset,
- .config_aneg = lan87xx_config_aneg_ext,
+ .config_aneg = lan95xx_config_aneg_ext,

/* IRQ related */
.config_intr = smsc_phy_config_intr,
--
2.30.2