[PATCH 5.14 111/151] net: dsa: fix spurious error message when unoffloaded port leaves bridge

[Greg Kroah-Hartman]

From: Alvin Šipraga <alsi@xxxxxxxxxxxxxxx>

commit 43a4b4dbd48c9006ef64df3a12acf33bdfe11c61 upstream.

Flip the sign of a return value check, thereby suppressing the following
spurious error:

  port 2 failed to notify DSA_NOTIFIER_BRIDGE_LEAVE: -EOPNOTSUPP

... which is emitted when removing an unoffloaded DSA switch port from a
bridge.

Fixes: d371b7c92d19 ("net: dsa: Unset vlan_filtering when ports leave the bridge")
Signed-off-by: Alvin Šipraga <alsi@xxxxxxxxxxxxxxx>
Reviewed-by: Vladimir Oltean <olteanv@xxxxxxxxx>
Reviewed-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
Link: https://lore.kernel.org/r/20211012112730.3429157-1-alvin@xxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/dsa/switch.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/dsa/switch.c
+++ b/net/dsa/switch.c
@@ -148,7 +148,7 @@ static int dsa_switch_bridge_leave(struc
 		if (extack._msg)
 			dev_err(ds->dev, "port %d: %s\n", info->port,
 				extack._msg);
-		if (err && err != EOPNOTSUPP)
+		if (err && err != -EOPNOTSUPP)
 			return err;
 	}
 	return 0;