openwrt/target/linux/generic/backport-5.4/773-v5.12-net-dsa-move-switchdev-event-implementation-under-th.patch

From 447d290a58bd335d68f665713842365d3d6447df Mon Sep 17 00:00:00 2001
From: Vladimir Oltean <vladimir.oltean@nxp.com>
Date: Wed, 6 Jan 2021 11:51:33 +0200
Subject: [PATCH] net: dsa: move switchdev event implementation under the same
 switch/case statement

We'll need to start listening to SWITCHDEV_FDB_{ADD,DEL}_TO_DEVICE
events even for interfaces where dsa_slave_dev_check returns false, so
we need that check inside the switch-case statement for SWITCHDEV_FDB_*.

This movement also avoids a useless allocation / free of switchdev_work
on the untreated "default event" case.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 net/dsa/slave.c | 35 ++++++++++++++++-------------------
 1 file changed, 16 insertions(+), 19 deletions(-)

--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -1639,31 +1639,29 @@ static int dsa_slave_switchdev_event(str
 	struct dsa_port *dp;
 	int err;
 
-	if (event == SWITCHDEV_PORT_ATTR_SET) {
+	switch (event) {
+	case SWITCHDEV_PORT_ATTR_SET:
 		err = switchdev_handle_port_attr_set(dev, ptr,
 						     dsa_slave_dev_check,
 						     dsa_slave_port_attr_set);
 		return notifier_from_errno(err);
-	}
-
-	if (!dsa_slave_dev_check(dev))
-		return NOTIFY_DONE;
+	case SWITCHDEV_FDB_ADD_TO_DEVICE:
+	case SWITCHDEV_FDB_DEL_TO_DEVICE:
+		if (!dsa_slave_dev_check(dev))
+			return NOTIFY_DONE;
 
-	dp = dsa_slave_to_port(dev);
+		dp = dsa_slave_to_port(dev);
 
-	switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
-	if (!switchdev_work)
-		return NOTIFY_BAD;
-
-	INIT_WORK(&switchdev_work->work,
-		  dsa_slave_switchdev_event_work);
-	switchdev_work->ds = dp->ds;
-	switchdev_work->port = dp->index;
-	switchdev_work->event = event;
+		switchdev_work = kzalloc(sizeof(*switchdev_work), GFP_ATOMIC);
+		if (!switchdev_work)
+			return NOTIFY_BAD;
+
+		INIT_WORK(&switchdev_work->work,
+			  dsa_slave_switchdev_event_work);
+		switchdev_work->ds = dp->ds;
+		switchdev_work->port = dp->index;
+		switchdev_work->event = event;
 
-	switch (event) {
-	case SWITCHDEV_FDB_ADD_TO_DEVICE: /* fall through */
-	case SWITCHDEV_FDB_DEL_TO_DEVICE:
 		fdb_info = ptr;
 
 		if (!fdb_info->added_by_user) {
@@ -1676,13 +1674,12 @@ static int dsa_slave_switchdev_event(str
 		switchdev_work->vid = fdb_info->vid;
 
 		dev_hold(dev);
+		dsa_schedule_work(&switchdev_work->work);
 		break;
 	default:
-		kfree(switchdev_work);
 		return NOTIFY_DONE;
 	}
 
-	dsa_schedule_work(&switchdev_work->work);
 	return NOTIFY_OK;
 }