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From:   Alexandru Tachici <alexandru.tachici@analog.com>
To:     <linux-kernel@vger.kernel.org>
CC:     <andrew@lunn.ch>, <linux@armlinux.org.uk>, <davem@davemloft.net>,
        <edumazet@google.com>, <kuba@kernel.org>, <pabeni@redhat.com>,
        <netdev@vger.kernel.org>, <lennart@lfdomain.com>
Subject: [net v4 1/1] net: ethernet: adi: adin1110: Fix notifiers
Date:   Thu, 27 Oct 2022 12:56:55 +0300
Message-ID: <20221027095655.89890-2-alexandru.tachici@analog.com>
In-Reply-To: <20221027095655.89890-1-alexandru.tachici@analog.com>
References: <20221027095655.89890-1-alexandru.tachici@analog.com>
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ADIN1110 was registering netdev_notifiers on each device probe.
This leads to warnings/probe failures because of double registration
of the same notifier when to adin1110/2111 devices are connected to
the same system.

Move the registration of netdev_notifiers in module init call,
in this way multiple driver instances can use the same notifiers.

Fixes: bc93e19d088b ("net: ethernet: adi: Add ADIN1110 support")
Signed-off-by: Alexandru Tachici <alexandru.tachici@analog.com>
---
 drivers/net/ethernet/adi/adin1110.c | 38 ++++++++++++++++++++++-------
 1 file changed, 29 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/adi/adin1110.c b/drivers/net/ethernet/adi/adin1110.c
index 1c0015b55993..0805f249fff2 100644
--- a/drivers/net/ethernet/adi/adin1110.c
+++ b/drivers/net/ethernet/adi/adin1110.c
@@ -1528,16 +1528,15 @@ static struct notifier_block adin1110_switchdev_notifier = {
 	.notifier_call = adin1110_switchdev_event,
 };
 
-static void adin1110_unregister_notifiers(void *data)
+static void adin1110_unregister_notifiers(void)
 {
 	unregister_switchdev_blocking_notifier(&adin1110_switchdev_blocking_notifier);
 	unregister_switchdev_notifier(&adin1110_switchdev_notifier);
 	unregister_netdevice_notifier(&adin1110_netdevice_nb);
 }
 
-static int adin1110_setup_notifiers(struct adin1110_priv *priv)
+static int adin1110_setup_notifiers(void)
 {
-	struct device *dev = &priv->spidev->dev;
 	int ret;
 
 	ret = register_netdevice_notifier(&adin1110_netdevice_nb);
@@ -1552,13 +1551,14 @@ static int adin1110_setup_notifiers(struct adin1110_priv *priv)
 	if (ret < 0)
 		goto err_sdev;
 
-	return devm_add_action_or_reset(dev, adin1110_unregister_notifiers, NULL);
+	return 0;
 
 err_sdev:
 	unregister_switchdev_notifier(&adin1110_switchdev_notifier);
 
 err_netdev:
 	unregister_netdevice_notifier(&adin1110_netdevice_nb);
+
 	return ret;
 }
 
@@ -1629,10 +1629,6 @@ static int adin1110_probe_netdevs(struct adin1110_priv *priv)
 	if (ret < 0)
 		return ret;
 
-	ret = adin1110_setup_notifiers(priv);
-	if (ret < 0)
-		return ret;
-
 	for (i = 0; i < priv->cfg->ports_nr; i++) {
 		ret = devm_register_netdev(dev, priv->ports[i]->netdev);
 		if (ret < 0) {
@@ -1709,7 +1705,31 @@ static struct spi_driver adin1110_driver = {
 	.probe = adin1110_probe,
 	.id_table = adin1110_spi_id,
 };
-module_spi_driver(adin1110_driver);
+
+static int __init adin1110_driver_init(void)
+{
+	int ret;
+
+	ret = adin1110_setup_notifiers();
+	if (ret < 0)
+		return ret;
+
+	ret = spi_register_driver(&adin1110_driver);
+	if (ret < 0) {
+		adin1110_unregister_notifiers();
+		return ret;
+	}
+
+	return 0;
+}
+
+static void __exit adin1110_exit(void)
+{
+	adin1110_unregister_notifiers();
+	spi_unregister_driver(&adin1110_driver);
+}
+module_init(adin1110_driver_init);
+module_exit(adin1110_exit);
 
 MODULE_DESCRIPTION("ADIN1110 Network driver");
 MODULE_AUTHOR("Alexandru Tachici <alexandru.tachici@analog.com>");
-- 
2.34.1