switchdev: fix BUG when port driver doesn't support set attr op

Fix a BUG_ON() where CONFIG_NET_SWITCHDEV is set but the driver for a
bridged port does not support switchdev_port_attr_set op.  Don't BUG_ON()
if -EOPNOTSUPP is returned.

Also change BUG_ON() to netdev_err since this is a normal error path and
does not warrant the use of BUG_ON(), which is reserved for unrecoverable
errs.

Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Reported-by: Brenden Blanco <bblanco@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c
index b683e89b4caa..658bc3ac8008 100644
--- a/net/switchdev/switchdev.c
+++ b/net/switchdev/switchdev.c
@@ -103,7 +103,9 @@ static void switchdev_port_attr_set_work(struct work_struct *work)
 
         rtnl_lock();
         err = switchdev_port_attr_set(asw->dev, &asw->attr);
-        BUG_ON(err);
+        if (err && err != -EOPNOTSUPP)
+                netdev_err(asw->dev, "failed (err=%d) to set attribute (id=%d)\n",
+                           err, asw->attr.id);
         rtnl_unlock();
 
         dev_put(asw->dev);