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net: dsa: qca8k: fix kernel panic with legacy mdio mapping 

When the mdio legacy mapping is used the mii_bus priv registered by DSA
refer to the dsa switch struct instead of the qca8k_priv struct and
causes a kernel panic. Create dedicated function when the internal
dedicated mdio driver is used to properly handle the 2 different
implementation.

Fixes: 759bafb8a3 ("net: dsa: qca8k: add support for internal phy and internal mdio")
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ansuel Smith 2021-09-11 17:50:09 +02:00 committed by David S. Miller
parent 08dad2f4d5
commit ce062a0adb
1 changed files with 22 additions and 8 deletions
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30
drivers/net/dsa/qca8k.c
View File

@ -643,10 +643,8 @@ qca8k_mdio_busy_wait(struct mii_bus *bus, u32 reg, u32 mask)
}
static int
qca8k_mdio_write(struct mii_bus *salve_bus, int phy, int regnum, u16 data)
qca8k_mdio_write(struct mii_bus *bus, int phy, int regnum, u16 data)
{
struct qca8k_priv *priv = salve_bus->priv;
struct mii_bus *bus = priv->bus;
u16 r1, r2, page;
u32 val;
int ret;
@ -682,10 +680,8 @@ exit:
}
static int
qca8k_mdio_read(struct mii_bus *salve_bus, int phy, int regnum)
qca8k_mdio_read(struct mii_bus *bus, int phy, int regnum)
{
struct qca8k_priv *priv = salve_bus->priv;
struct mii_bus *bus = priv->bus;
u16 r1, r2, page;
u32 val;
int ret;
@ -726,6 +722,24 @@ exit:
return ret;
}
static int
qca8k_internal_mdio_write(struct mii_bus *slave_bus, int phy, int regnum, u16 data)
{
struct qca8k_priv *priv = slave_bus->priv;
struct mii_bus *bus = priv->bus;
return qca8k_mdio_write(bus, phy, regnum, data);
}
static int
qca8k_internal_mdio_read(struct mii_bus *slave_bus, int phy, int regnum)
{
struct qca8k_priv *priv = slave_bus->priv;
struct mii_bus *bus = priv->bus;
return qca8k_mdio_read(bus, phy, regnum);
}
static int
qca8k_phy_write(struct dsa_switch *ds, int port, int regnum, u16 data)
{
@ -775,8 +789,8 @@ qca8k_mdio_register(struct qca8k_priv *priv, struct device_node *mdio)
bus->priv = (void *)priv;
bus->name = "qca8k slave mii";
bus->read = qca8k_mdio_read;
bus->write = qca8k_mdio_write;
bus->read = qca8k_internal_mdio_read;
bus->write = qca8k_internal_mdio_write;
snprintf(bus->id, MII_BUS_ID_SIZE, "qca8k-%d",
ds->index);