From: Linus Walleij <linus.walleij@linaro.org>
Date: Sat, 5 Sep 2020 12:32:33 +0200
Subject: net: dsa: rtl8366: Properly clear member config
Git-commit: 4ddcaf1ebb5e4e99240f29d531ee69d4244fe416
Patch-mainline: 5.9-rc7
References: networking-stable-20_09_24

When removing a port from a VLAN we are just erasing the
member config for the VLAN, which is wrong: other ports
can be using it.

Just mask off the port and only zero out the rest of the
member config once ports using of the VLAN are removed
from it.

Reported-by: Florian Fainelli <f.fainelli@gmail.com>
Fixes: d8652956cf37 ("net: dsa: realtek-smi: Add Realtek SMI driver")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/net/dsa/rtl8366.c |   20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

--- a/drivers/net/dsa/rtl8366.c
+++ b/drivers/net/dsa/rtl8366.c
@@ -439,13 +439,19 @@ int rtl8366_vlan_del(struct dsa_switch *
 				return ret;
 
 			if (vid == vlanmc.vid) {
-				/* clear VLAN member configurations */
-				vlanmc.vid = 0;
-				vlanmc.priority = 0;
-				vlanmc.member = 0;
-				vlanmc.untag = 0;
-				vlanmc.fid = 0;
-
+				/* Remove this port from the VLAN */
+				vlanmc.member &= ~BIT(port);
+				vlanmc.untag &= ~BIT(port);
+				/*
+				 * If no ports are members of this VLAN
+				 * anymore then clear the whole member
+				 * config so it can be reused.
+				 */
+				if (!vlanmc.member && vlanmc.untag) {
+					vlanmc.vid = 0;
+					vlanmc.priority = 0;
+					vlanmc.fid = 0;
+				}
 				ret = smi->ops->set_vlan_mc(smi, i, &vlanmc);
 				if (ret) {
 					dev_err(smi->dev,