linux-kernel - [PATCH net-next 06/12] net: dpaa2-switch: assign port_priv->mac after dpaa2_mac

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Date:   Tue, 29 Nov 2022 16:12:15 +0200
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     netdev@...r.kernel.org
Cc:     Ioana Ciornei <ioana.ciornei@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 06/12] net: dpaa2-switch: assign port_priv->mac after dpaa2_mac_connect() call

The dpaa2-switch has the exact same locking requirements when connected
to a DPMAC, so it needs port_priv->mac to always point either to NULL,
or to a DPMAC with a fully initialized phylink instance.

Make the same preparatory change in the dpaa2-switch driver as in the
dpaa2-eth one.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 .../ethernet/freescale/dpaa2/dpaa2-switch.c   | 21 +++++++++++--------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c
index 42d3290ccd8b..3b0963d95f67 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-switch.c
@@ -1449,9 +1449,8 @@ static int dpaa2_switch_port_connect_mac(struct ethsw_port_priv *port_priv)
 	err = dpaa2_mac_open(mac);
 	if (err)
 		goto err_free_mac;
-	port_priv->mac = mac;
 
-	if (dpaa2_switch_port_is_type_phy(port_priv)) {
+	if (dpaa2_mac_is_type_phy(mac)) {
 		err = dpaa2_mac_connect(mac);
 		if (err) {
 			netdev_err(port_priv->netdev,
@@ -1461,11 +1460,12 @@ static int dpaa2_switch_port_connect_mac(struct ethsw_port_priv *port_priv)
 		}
 	}
 
+	port_priv->mac = mac;
+
 	return 0;
 
 err_close_mac:
 	dpaa2_mac_close(mac);
-	port_priv->mac = NULL;
 err_free_mac:
 	kfree(mac);
 	return err;
@@ -1473,15 +1473,18 @@ static int dpaa2_switch_port_connect_mac(struct ethsw_port_priv *port_priv)
 
 static void dpaa2_switch_port_disconnect_mac(struct ethsw_port_priv *port_priv)
 {
-	if (dpaa2_switch_port_is_type_phy(port_priv))
-		dpaa2_mac_disconnect(port_priv->mac);
+	struct dpaa2_mac *mac = port_priv->mac;
 
-	if (!dpaa2_switch_port_has_mac(port_priv))
+	port_priv->mac = NULL;
+
+	if (!mac)
 		return;
 
-	dpaa2_mac_close(port_priv->mac);
-	kfree(port_priv->mac);
-	port_priv->mac = NULL;
+	if (dpaa2_mac_is_type_phy(mac))
+		dpaa2_mac_disconnect(mac);
+
+	dpaa2_mac_close(mac);
+	kfree(mac);
 }
 
 static irqreturn_t dpaa2_switch_irq0_handler_thread(int irq_num, void *arg)
-- 
2.34.1