netdev - [PATCH net] net: sparx5: Fix add vlan when invalid operation

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Message-ID: <20220225101516.mhafzkt3mlgmdafc@wse-c0155>
Date:   Fri, 25 Feb 2022 11:15:16 +0100
From:   Casper Andersson <casper.casan@...il.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        Steen Hegelund <Steen.Hegelund@...rochip.com>,
        UNGLinuxDriver@...rochip.com,
        Bjarni Jonasson <bjarni.jonasson@...rochip.com>
Cc:     netdev@...r.kernel.org
Subject: [PATCH net] net: sparx5: Fix add vlan when invalid operation

Check if operation is valid before changing any
settings in hardware. Otherwise it results in
changes being made despite it not being a valid
operation.

Fixes: 78eab33bb68b ("net: sparx5: add vlan support")

Signed-off-by: Casper Andersson <casper.casan@...il.com>
---
Maybe not obvious from the code changes, but the code is moved down
a couple lines to after check for if it tries to add a second untagged
VLAN to a port. Multiple untagged VLANs on a port is not allowed, but
the changes were made to the hardware anyways.

 .../ethernet/microchip/sparx5/sparx5_vlan.c   | 20 +++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/microchip/sparx5/sparx5_vlan.c b/drivers/net/ethernet/microchip/sparx5/sparx5_vlan.c
index 4ce490a25f33..8e56ffa1c4f7 100644
--- a/drivers/net/ethernet/microchip/sparx5/sparx5_vlan.c
+++ b/drivers/net/ethernet/microchip/sparx5/sparx5_vlan.c
@@ -58,16 +58,6 @@ int sparx5_vlan_vid_add(struct sparx5_port *port, u16 vid, bool pvid,
 	struct sparx5 *sparx5 = port->sparx5;
 	int ret;
 
-	/* Make the port a member of the VLAN */
-	set_bit(port->portno, sparx5->vlan_mask[vid]);
-	ret = sparx5_vlant_set_mask(sparx5, vid);
-	if (ret)
-		return ret;
-
-	/* Default ingress vlan classification */
-	if (pvid)
-		port->pvid = vid;
-
 	/* Untagged egress vlan classification */
 	if (untagged && port->vid != vid) {
 		if (port->vid) {
@@ -79,6 +69,16 @@ int sparx5_vlan_vid_add(struct sparx5_port *port, u16 vid, bool pvid,
 		port->vid = vid;
 	}
 
+	/* Make the port a member of the VLAN */
+	set_bit(port->portno, sparx5->vlan_mask[vid]);
+	ret = sparx5_vlant_set_mask(sparx5, vid);
+	if (ret)
+		return ret;
+
+	/* Default ingress vlan classification */
+	if (pvid)
+		port->pvid = vid;
+
 	sparx5_vlan_port_apply(sparx5, port);
 
 	return 0;
-- 
2.30.2