linux-kernel - [PATCH 2/2] net: ethernet: ti: am65-cpsw: avoid devm_alloc

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Message-ID: <20240927025301.1312590-2-nico@fluxnic.net>
Date: Thu, 26 Sep 2024 22:53:00 -0400
From: Nicolas Pitre <nico@...xnic.net>
To: "David S. Miller" <davem@...emloft.net>,
	Paolo Abeni <pabeni@...hat.com>
Cc: Nicolas Pitre <npitre@...libre.com>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] net: ethernet: ti: am65-cpsw: avoid devm_alloc_etherdev, fix module removal

From: Nicolas Pitre <npitre@...libre.com>

Usage of devm_alloc_etherdev_mqs() conflicts with
am65_cpsw_nuss_cleanup_ndev() as the same struct net_device instances
get unregistered twice. Switch to alloc_etherdev_mqs() and make sure
am65_cpsw_nuss_cleanup_ndev() unregisters and frees those net_device
instances properly.

With this, it is finally possible to rmmod the driver without oopsing
the kernel.

Signed-off-by: Nicolas Pitre <npitre@...libre.com>
---
 drivers/net/ethernet/ti/am65-cpsw-nuss.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index f6bc8a4dc6..4cb1c187c6 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -2744,10 +2744,9 @@ am65_cpsw_nuss_init_port_ndev(struct am65_cpsw_common *common, u32 port_idx)
 		return 0;
 
 	/* alloc netdev */
-	port->ndev = devm_alloc_etherdev_mqs(common->dev,
-					     sizeof(struct am65_cpsw_ndev_priv),
-					     AM65_CPSW_MAX_QUEUES,
-					     AM65_CPSW_MAX_QUEUES);
+	port->ndev = alloc_etherdev_mqs(sizeof(struct am65_cpsw_ndev_priv),
+					AM65_CPSW_MAX_QUEUES,
+					AM65_CPSW_MAX_QUEUES);
 	if (!port->ndev) {
 		dev_err(dev, "error allocating slave net_device %u\n",
 			port->port_id);
@@ -2858,7 +2857,7 @@ static int am65_cpsw_nuss_init_ndevs(struct am65_cpsw_common *common)
 			return ret;
 	}
 
-	return ret;
+	return 0;
 }
 
 static void am65_cpsw_nuss_cleanup_ndev(struct am65_cpsw_common *common)
@@ -2868,8 +2867,12 @@ static void am65_cpsw_nuss_cleanup_ndev(struct am65_cpsw_common *common)
 
 	for (i = 0; i < common->port_num; i++) {
 		port = &common->ports[i];
-		if (port->ndev && port->ndev->reg_state == NETREG_REGISTERED)
+		if (!port->ndev)
+			continue;
+		if (port->ndev->reg_state == NETREG_REGISTERED)
 			unregister_netdev(port->ndev);
+		free_netdev(port->ndev);
+		port->ndev = NULL;
 	}
 }
 
@@ -3624,6 +3627,7 @@ static int am65_cpsw_nuss_probe(struct platform_device *pdev)
 
 err_free_phylink:
 	am65_cpsw_nuss_phylink_cleanup(common);
+	am65_cpsw_nuss_cleanup_ndev(common);
 	am65_cpts_release(common->cpts);
 err_of_clear:
 	if (common->mdio_dev)
-- 
2.46.1