[PATCH 4.14 031/218] net: phy: micrel: Allow probing without .driver_data

From: Greg Kroah-Hartman
Date: Mon Jun 13 2022 - 06:41:41 EST


From: Fabio Estevam <festevam@xxxxxxx>

[ Upstream commit f2ef6f7539c68c6bd6c32323d8845ee102b7c450 ]

Currently, if the .probe element is present in the phy_driver structure
and the .driver_data is not, a NULL pointer dereference happens.

Allow passing .probe without .driver_data by inserting NULL checks
for priv->type.

Signed-off-by: Fabio Estevam <festevam@xxxxxxx>
Reviewed-by: Andrew Lunn <andrew@xxxxxxx>
Link: https://lore.kernel.org/r/20220513114613.762810-1-festevam@xxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/net/phy/micrel.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index 755aa6741292..6f15cd5d4e7a 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -285,7 +285,7 @@ static int kszphy_config_reset(struct phy_device *phydev)
}
}

- if (priv->led_mode >= 0)
+ if (priv->type && priv->led_mode >= 0)
kszphy_setup_led(phydev, priv->type->led_mode_reg, priv->led_mode);

return 0;
@@ -301,10 +301,10 @@ static int kszphy_config_init(struct phy_device *phydev)

type = priv->type;

- if (type->has_broadcast_disable)
+ if (type && type->has_broadcast_disable)
kszphy_broadcast_disable(phydev);

- if (type->has_nand_tree_disable)
+ if (type && type->has_nand_tree_disable)
kszphy_nand_tree_disable(phydev);

return kszphy_config_reset(phydev);
@@ -764,7 +764,7 @@ static int kszphy_probe(struct phy_device *phydev)

priv->type = type;

- if (type->led_mode_reg) {
+ if (type && type->led_mode_reg) {
ret = of_property_read_u32(np, "micrel,led-mode",
&priv->led_mode);
if (ret)
@@ -785,7 +785,8 @@ static int kszphy_probe(struct phy_device *phydev)
unsigned long rate = clk_get_rate(clk);
bool rmii_ref_clk_sel_25_mhz;

- priv->rmii_ref_clk_sel = type->has_rmii_ref_clk_sel;
+ if (type)
+ priv->rmii_ref_clk_sel = type->has_rmii_ref_clk_sel;
rmii_ref_clk_sel_25_mhz = of_property_read_bool(np,
"micrel,rmii-reference-clock-select-25-mhz");

--
2.35.1