Subject: [PATCH AUTOSEL 5.18 134/159] net: phy: micrel: Allow probing without .driver_data

From: Sasha Levin <[email-masked]>
Date: Mon, 30 May 2022 09:23:59 -0400

From: Fabio Estevam <[email-masked]>

[ 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 <[email-masked]>
Reviewed-by: Andrew Lunn <[email-masked]>
Link: https://lore.kernel.org/r/[email-masked]
Signed-off-by: Jakub Kicinski <[email-masked]>
Signed-off-by: Sasha Levin <[email-masked]>
---
 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 cd9aa353b653..48c7d715a9e3 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -497,7 +497,7 @@ 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;
@@ -513,10 +513,10 @@ 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);
@@ -1514,7 +1514,7 @@ 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)
@@ -1535,7 +1535,8 @@ 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