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Date:   Fri, 18 Sep 2020 04:07:30 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     davem@...emloft.net, netdev@...r.kernel.org
Cc:     yangbo.lu@....com, xiaoliang.yang_1@....com,
        UNGLinuxDriver@...rochip.com, claudiu.manoil@....com,
        alexandre.belloni@...tlin.com, andrew@...n.ch,
        vivien.didelot@...il.com, f.fainelli@...il.com, kuba@...nel.org
Subject: [PATCH v2 net 8/8] net: mscc: ocelot: deinitialize only initialized ports

From: Vladimir Oltean <vladimir.oltean@....com>

Currently mscc_ocelot_init_ports() will skip initializing a port when it
doesn't have a phy-handle, so the ocelot->ports[port] pointer will be
NULL. Take this into consideration when tearing down the driver, and add
a new function ocelot_deinit_port() to the switch library, mirror of
ocelot_init_port(), which needs to be called by the driver for all ports
it has initialized.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
Changes in v2:
Patch is new.

 drivers/net/dsa/ocelot/felix.c             |  3 +++
 drivers/net/ethernet/mscc/ocelot.c         | 16 ++++++++--------
 drivers/net/ethernet/mscc/ocelot_vsc7514.c |  2 ++
 include/soc/mscc/ocelot.h                  |  1 +
 4 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/drivers/net/dsa/ocelot/felix.c b/drivers/net/dsa/ocelot/felix.c
index f7b43f8d56ed..64939ee14648 100644
--- a/drivers/net/dsa/ocelot/felix.c
+++ b/drivers/net/dsa/ocelot/felix.c
@@ -624,10 +624,13 @@ static void felix_teardown(struct dsa_switch *ds)
 {
 	struct ocelot *ocelot = ds->priv;
 	struct felix *felix = ocelot_to_felix(ocelot);
+	int port;
 
 	if (felix->info->mdio_bus_free)
 		felix->info->mdio_bus_free(ocelot);
 
+	for (port = 0; port < ocelot->num_phys_ports; port++)
+		ocelot_deinit_port(ocelot, port);
 	ocelot_deinit_timestamp(ocelot);
 	/* stop workqueue thread */
 	ocelot_deinit(ocelot);
diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index 83eb7c325061..8518e1d60da4 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -1550,18 +1550,18 @@ EXPORT_SYMBOL(ocelot_init);
 
 void ocelot_deinit(struct ocelot *ocelot)
 {
-	struct ocelot_port *port;
-	int i;
-
 	cancel_delayed_work(&ocelot->stats_work);
 	destroy_workqueue(ocelot->stats_queue);
 	mutex_destroy(&ocelot->stats_lock);
-
-	for (i = 0; i < ocelot->num_phys_ports; i++) {
-		port = ocelot->ports[i];
-		skb_queue_purge(&port->tx_skbs);
-	}
 }
 EXPORT_SYMBOL(ocelot_deinit);
 
+void ocelot_deinit_port(struct ocelot *ocelot, int port)
+{
+	struct ocelot_port *ocelot_port = ocelot->ports[port];
+
+	skb_queue_purge(&ocelot_port->tx_skbs);
+}
+EXPORT_SYMBOL(ocelot_deinit_port);
+
 MODULE_LICENSE("Dual MIT/GPL");
diff --git a/drivers/net/ethernet/mscc/ocelot_vsc7514.c b/drivers/net/ethernet/mscc/ocelot_vsc7514.c
index 252c49b5f22b..e02fb8bfab63 100644
--- a/drivers/net/ethernet/mscc/ocelot_vsc7514.c
+++ b/drivers/net/ethernet/mscc/ocelot_vsc7514.c
@@ -908,6 +908,8 @@ static void mscc_ocelot_release_ports(struct ocelot *ocelot)
 		if (!ocelot_port)
 			continue;
 
+		ocelot_deinit_port(ocelot, port);
+
 		priv = container_of(ocelot_port, struct ocelot_port_private,
 				    port);
 
diff --git a/include/soc/mscc/ocelot.h b/include/soc/mscc/ocelot.h
index 4521dd602ddc..0ac4e7fba086 100644
--- a/include/soc/mscc/ocelot.h
+++ b/include/soc/mscc/ocelot.h
@@ -678,6 +678,7 @@ void ocelot_configure_cpu(struct ocelot *ocelot, int npi,
 int ocelot_init(struct ocelot *ocelot);
 void ocelot_deinit(struct ocelot *ocelot);
 void ocelot_init_port(struct ocelot *ocelot, int port);
+void ocelot_deinit_port(struct ocelot *ocelot, int port);
 
 /* DSA callbacks */
 void ocelot_port_enable(struct ocelot *ocelot, int port,
-- 
2.25.1

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