netdev - [PATCH 13/13] net: dsa: lan9303: lan9303_port_mdb

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Date:   Thu, 20 Jul 2017 15:57:28 +0200
From:   Egil Hjelmeland <egil.hjelmeland@...itel.com>
To:     <corbet@....net>, <andrew@...n.ch>,
        <vivien.didelot@...oirfairelinux.com>, <f.fainelli@...il.com>,
        <davem@...emloft.net>, <kernel@...gutronix.de>,
        <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <netdev@...r.kernel.org>
CC:     <egil.hjelmeland@...itel.com>
Subject: [PATCH 13/13] net: dsa: lan9303: lan9303_port_mdb_del remove port 0

Workaround for dsa_switch_mdb_add adding CPU port to group,
but forgetting to remove it:

Remove port 0 if only port 0 is only port left.

Signed-off-by: Egil Hjelmeland <egil.hjelmeland@...itel.com>
---
 drivers/net/dsa/lan9303-core.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/net/dsa/lan9303-core.c b/drivers/net/dsa/lan9303-core.c
index 54646eb38185..61c915eed649 100644
--- a/drivers/net/dsa/lan9303-core.c
+++ b/drivers/net/dsa/lan9303-core.c
@@ -1424,6 +1424,17 @@ static int lan9303_port_mdb_del(
 	if (mdb->vid)
 		return -EOPNOTSUPP;
 	lan9303_alr_del_port(chip, mdb->addr, port);
+
+	{
+		/* Workaround for dsa_switch_mdb_add adding CPU port to
+		 * group, but forgetting to remove it. Remove port 0
+		 * if only port left
+		 **/
+		struct lan9303_alr_cache_entry *entr =
+			lan9303_alr_cache_find_mac(chip, mdb->addr);
+		if (entr && (entr->port_map == BIT(0)))
+			lan9303_alr_del_port(chip, mdb->addr, 0);
+	}
 	return 0;
 }
 
-- 
2.11.0


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