net: dsa: Provide unique DSA slave MII bus names

In case we have multiples trees and switches with the same index, we
need to add another discriminating id: the switch tree.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index 15a492261895..a51dfedf0014 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -49,7 +49,8 @@ void dsa_slave_mii_bus_init(struct dsa_switch *ds)
         ds->slave_mii_bus->name = "dsa slave smi";
         ds->slave_mii_bus->read = dsa_slave_phy_read;
         ds->slave_mii_bus->write = dsa_slave_phy_write;
-        snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d", ds->index);
+        snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d.%d",
+                 ds->dst->tree, ds->index);
         ds->slave_mii_bus->parent = ds->dev;
         ds->slave_mii_bus->phy_mask = ~ds->phys_mii_mask;
 }