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Commit b8d866ac authored by Vivien Didelot's avatar Vivien Didelot Committed by David S. Miller
Browse files

net: dsa: fix preparation of a port STP update 



Because of the default 0 value of ret in dsa_slave_port_attr_set, a
driver may return -EOPNOTSUPP from the commit phase of a STP state,
which triggers a WARN() from switchdev.

This happened on a 6185 switch which does not support hardware bridging.

Reported-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarVivien Didelot <vivien.didelot@savoirfairelinux.com>
Acked-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 21fdd092

net/dsa/slave.c

+8 −3
Original line number Diff line number Diff line
@@ -453,12 +453,17 @@ static int dsa_slave_port_attr_set(struct net_device *dev, 
				   struct switchdev_attr *attr,

				   struct switchdev_trans *trans)

{

	int ret = 0;

	struct dsa_slave_priv *p = netdev_priv(dev);

	struct dsa_switch *ds = p->parent;

	int ret;



	switch (attr->id) {

	case SWITCHDEV_ATTR_PORT_STP_STATE:

		if (switchdev_trans_ph_commit(trans))

			ret = dsa_slave_stp_update(dev, attr->u.stp_state);

		if (switchdev_trans_ph_prepare(trans))

			ret = ds->drv->port_stp_update ? 0 : -EOPNOTSUPP;

		else

			ret = ds->drv->port_stp_update(ds, p->port,

						       attr->u.stp_state);

		break;

	default:

		ret = -EOPNOTSUPP;