diff options
| -rw-r--r-- | drivers/net/dsa/qca/qca8k-8xxx.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/net/dsa/qca/qca8k-8xxx.c b/drivers/net/dsa/qca/qca8k-8xxx.c index b3f798866899..1e94ba1031ec 100644 --- a/drivers/net/dsa/qca/qca8k-8xxx.c +++ b/drivers/net/dsa/qca/qca8k-8xxx.c @@ -544,6 +544,15 @@ qca8k_phy_eth_command(struct qca8k_priv *priv, bool read, int phy, goto err_read_skb; } + /* It seems that accessing the switch's internal PHYs via management + * packets still uses the MDIO bus within the switch internally, and + * these accesses can conflict with external MDIO accesses to other + * devices on the MDIO bus. + * We therefore need to lock the MDIO bus onto which the switch is + * connected. + */ + mutex_lock(&priv->bus->mdio_lock); + /* Actually start the request: * 1. Send mdio master packet * 2. Busy Wait for mdio master command @@ -556,6 +565,7 @@ qca8k_phy_eth_command(struct qca8k_priv *priv, bool read, int phy, mgmt_master = priv->mgmt_master; if (!mgmt_master) { mutex_unlock(&mgmt_eth_data->mutex); + mutex_unlock(&priv->bus->mdio_lock); ret = -EINVAL; goto err_mgmt_master; } @@ -643,6 +653,7 @@ exit: QCA8K_ETHERNET_TIMEOUT); mutex_unlock(&mgmt_eth_data->mutex); + mutex_unlock(&priv->bus->mdio_lock); return ret; |