net: ethernet: stmmac: fix altr_tse_pcs function when using a fixed-link

BugLink: https://bugs.launchpad.net/bugs/1969857
[ Upstream commit a6aaa00324240967272b451bfa772547bd576ee6 ]

When using a fixed-link, the altr_tse_pcs driver crashes
due to null-pointer dereference as no phy_device is provided to
tse_pcs_fix_mac_speed function. Fix this by adding a check for
phy_dev before calling the tse_pcs_fix_mac_speed() function.

Also clean up the tse_pcs_fix_mac_speed function a bit. There is
no need to check for splitter_base and sgmii_adapter_base
because the driver will fail if these 2 variables are not
derived from the device tree.

Fixes: fb3bbdb85989 ("net: ethernet: Add TSE PCS support to dwmac-socfpga")
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

diff --git a/drivers/net/ethernet/stmicro/stmmac/altr_tse_pcs.c b/drivers/net/ethernet/stmicro/stmmac/altr_tse_pcs.c
index cd478d2cd871ae46640bff2b0dd06eba384de777..00f6d347eaf75b33ec43c60aea8aca1fcaebdc7a 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/altr_tse_pcs.c
+++ b/drivers/net/ethernet/stmicro/stmmac/altr_tse_pcs.c
@@ -57,10 +57,6 @@
 #define TSE_PCS_USE_SGMII_ENA                          BIT(0)
 #define TSE_PCS_IF_USE_SGMII                           0x03
 
-#define SGMII_ADAPTER_CTRL_REG                         0x00
-#define SGMII_ADAPTER_DISABLE                          0x0001
-#define SGMII_ADAPTER_ENABLE                           0x0000
-
 #define AUTONEGO_LINK_TIMER                            20
 
 static int tse_pcs_reset(void __iomem *base, struct tse_pcs *pcs)
@@ -202,12 +198,8 @@ void tse_pcs_fix_mac_speed(struct tse_pcs *pcs, struct phy_device *phy_dev,
                           unsigned int speed)
 {
        void __iomem *tse_pcs_base = pcs->tse_pcs_base;
-       void __iomem *sgmii_adapter_base = pcs->sgmii_adapter_base;
        u32 val;
 
-       writew(SGMII_ADAPTER_ENABLE,
-              sgmii_adapter_base + SGMII_ADAPTER_CTRL_REG);
-
        pcs->autoneg = phy_dev->autoneg;
 
        if (phy_dev->autoneg == AUTONEG_ENABLE) {

diff --git a/drivers/net/ethernet/stmicro/stmmac/altr_tse_pcs.h b/drivers/net/ethernet/stmicro/stmmac/altr_tse_pcs.h
index 442812c0a4bdccb6d93eb6e754b7800df8fcad7e..694ac25ef426ba2e6a9848b6881b9e3386d32ef6 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/altr_tse_pcs.h
+++ b/drivers/net/ethernet/stmicro/stmmac/altr_tse_pcs.h
@@ -10,6 +10,10 @@
 #include <linux/phy.h>
 #include <linux/timer.h>
 
+#define SGMII_ADAPTER_CTRL_REG         0x00
+#define SGMII_ADAPTER_ENABLE           0x0000
+#define SGMII_ADAPTER_DISABLE          0x0001
+
 struct tse_pcs {
        struct device *dev;
        void __iomem *tse_pcs_base;

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
index b7c2579c963b68a72190a9b43f60dd852614858b..ac9e6c7a33b5540c5a7786c02be445a6e9930793 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
@@ -18,9 +18,6 @@
 
 #include "altr_tse_pcs.h"
 
-#define SGMII_ADAPTER_CTRL_REG                          0x00
-#define SGMII_ADAPTER_DISABLE                           0x0001
-
 #define SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_GMII_MII 0x0
 #define SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RGMII 0x1
 #define SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RMII 0x2
@@ -62,16 +59,14 @@ static void socfpga_dwmac_fix_mac_speed(void *priv, unsigned int speed)
 {
        struct socfpga_dwmac *dwmac = (struct socfpga_dwmac *)priv;
        void __iomem *splitter_base = dwmac->splitter_base;
-       void __iomem *tse_pcs_base = dwmac->pcs.tse_pcs_base;
        void __iomem *sgmii_adapter_base = dwmac->pcs.sgmii_adapter_base;
        struct device *dev = dwmac->dev;
        struct net_device *ndev = dev_get_drvdata(dev);
        struct phy_device *phy_dev = ndev->phydev;
        u32 val;
 
-       if ((tse_pcs_base) && (sgmii_adapter_base))
-               writew(SGMII_ADAPTER_DISABLE,
-                      sgmii_adapter_base + SGMII_ADAPTER_CTRL_REG);
+       writew(SGMII_ADAPTER_DISABLE,
+              sgmii_adapter_base + SGMII_ADAPTER_CTRL_REG);
 
        if (splitter_base) {
                val = readl(splitter_base + EMAC_SPLITTER_CTRL_REG);
@@ -93,7 +88,9 @@ static void socfpga_dwmac_fix_mac_speed(void *priv, unsigned int speed)
                writel(val, splitter_base + EMAC_SPLITTER_CTRL_REG);
        }
 
-       if (tse_pcs_base && sgmii_adapter_base)
+       writew(SGMII_ADAPTER_ENABLE,
+              sgmii_adapter_base + SGMII_ADAPTER_CTRL_REG);
+       if (phy_dev)
                tse_pcs_fix_mac_speed(&dwmac->pcs, phy_dev, speed);
 }