kernel: backport fixes for MediaTek Ethernet driver

Backport patches from net-next which fix possible memory and resource
leaks in the error codepaths of WED initialization.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

target/linux/generic/backport-5.15/728-v6.1-01-net-ethernet-mtk_eth_soc-fix-possible-memory-leak-in.patch

@@ -0,0 +1,73 @@
+From b3d0d98179d62f9d55635a600679c4fa362baf8d Mon Sep 17 00:00:00 2001
+From: Yang Yingliang <yangyingliang@huawei.com>
+Date: Mon, 17 Oct 2022 11:51:54 +0800
+Subject: [PATCH 1/3] net: ethernet: mtk_eth_soc: fix possible memory leak in
+ mtk_probe()
+
+If mtk_wed_add_hw() has been called, mtk_wed_exit() needs be called
+in error path or removing module to free the memory allocated in
+mtk_wed_add_hw().
+
+Fixes: 804775dfc288 ("net: ethernet: mtk_eth_soc: add support for Wireless Ethernet Dispatch (WED)")
+Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/ethernet/mediatek/mtk_eth_soc.c | 17 ++++++++++++-----
+ 1 file changed, 12 insertions(+), 5 deletions(-)
+
+--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
++++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+@@ -4008,19 +4008,23 @@ static int mtk_probe(struct platform_dev
+ 			eth->irq[i] = platform_get_irq(pdev, i);
+ 		if (eth->irq[i] < 0) {
+ 			dev_err(&pdev->dev, "no IRQ%d resource found\n", i);
+-			return -ENXIO;
++			err = -ENXIO;
++			goto err_wed_exit;
+ 		}
+ 	}
+ 	for (i = 0; i < ARRAY_SIZE(eth->clks); i++) {
+ 		eth->clks[i] = devm_clk_get(eth->dev,
+ 					    mtk_clks_source_name[i]);
+ 		if (IS_ERR(eth->clks[i])) {
+-			if (PTR_ERR(eth->clks[i]) == -EPROBE_DEFER)
+-				return -EPROBE_DEFER;
++			if (PTR_ERR(eth->clks[i]) == -EPROBE_DEFER) {
++				err = -EPROBE_DEFER;
++				goto err_wed_exit;
++			}
+ 			if (eth->soc->required_clks & BIT(i)) {
+ 				dev_err(&pdev->dev, "clock %s not found\n",
+ 					mtk_clks_source_name[i]);
+-				return -EINVAL;
++				err = -EINVAL;
++				goto err_wed_exit;
+ 			}
+ 			eth->clks[i] = NULL;
+ 		}
+@@ -4031,7 +4035,7 @@ static int mtk_probe(struct platform_dev
+ 
+ 	err = mtk_hw_init(eth);
+ 	if (err)
+-		return err;
++		goto err_wed_exit;
+ 
+ 	eth->hwlro = MTK_HAS_CAPS(eth->soc->caps, MTK_HWLRO);
+ 
+@@ -4129,6 +4133,8 @@ err_free_dev:
+ 	mtk_free_dev(eth);
+ err_deinit_hw:
+ 	mtk_hw_deinit(eth);
++err_wed_exit:
++	mtk_wed_exit();
+ 
+ 	return err;
+ }
+@@ -4148,6 +4154,7 @@ static int mtk_remove(struct platform_de
+ 		phylink_disconnect_phy(mac->phylink);
+ 	}
+ 
++	mtk_wed_exit();
+ 	mtk_hw_deinit(eth);
+ 
+ 	netif_napi_del(&eth->tx_napi);

target/linux/generic/backport-5.15/728-v6.1-02-net-ethernet-mtk_eth_wed-add-missing-put_device-in-m.patch

@@ -0,0 +1,47 @@
+From 9d4f20a476ca57e4c9246eb1fa2a61bea2354720 Mon Sep 17 00:00:00 2001
+From: Yang Yingliang <yangyingliang@huawei.com>
+Date: Mon, 17 Oct 2022 11:51:55 +0800
+Subject: [PATCH 2/3] net: ethernet: mtk_eth_wed: add missing put_device() in
+ mtk_wed_add_hw()
+
+After calling get_device() in mtk_wed_add_hw(), in error path, put_device()
+needs be called.
+
+Fixes: 804775dfc288 ("net: ethernet: mtk_eth_soc: add support for Wireless Ethernet Dispatch (WED)")
+Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/ethernet/mediatek/mtk_wed.c | 10 ++++++++--
+ 1 file changed, 8 insertions(+), 2 deletions(-)
+
+--- a/drivers/net/ethernet/mediatek/mtk_wed.c
++++ b/drivers/net/ethernet/mediatek/mtk_wed.c
+@@ -1084,11 +1084,11 @@ void mtk_wed_add_hw(struct device_node *
+ 	get_device(&pdev->dev);
+ 	irq = platform_get_irq(pdev, 0);
+ 	if (irq < 0)
+-		return;
++		goto err_put_device;
+ 
+ 	regs = syscon_regmap_lookup_by_phandle(np, NULL);
+ 	if (IS_ERR(regs))
+-		return;
++		goto err_put_device;
+ 
+ 	rcu_assign_pointer(mtk_soc_wed_ops, &wed_ops);
+ 
+@@ -1131,8 +1131,14 @@ void mtk_wed_add_hw(struct device_node *
+ 
+ 	hw_list[index] = hw;
+ 
++	mutex_unlock(&hw_lock);
++
++	return;
++
+ unlock:
+ 	mutex_unlock(&hw_lock);
++err_put_device:
++	put_device(&pdev->dev);
+ }
+ 
+ void mtk_wed_exit(void)

target/linux/generic/backport-5.15/728-v6.1-03-net-ethernet-mtk_eth_wed-add-missing-of_node_put.patch

@@ -0,0 +1,43 @@
+From e0bb4659e235770e6f53b3692e958591f49448f5 Mon Sep 17 00:00:00 2001
+From: Yang Yingliang <yangyingliang@huawei.com>
+Date: Mon, 17 Oct 2022 11:51:56 +0800
+Subject: [PATCH 3/3] net: ethernet: mtk_eth_wed: add missing of_node_put()
+
+The device_node pointer returned by of_parse_phandle() with refcount
+incremented, when finish using it, the refcount need be decreased.
+
+Fixes: 804775dfc288 ("net: ethernet: mtk_eth_soc: add support for Wireless Ethernet Dispatch (WED)")
+Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/ethernet/mediatek/mtk_wed.c | 5 ++++-
+ 1 file changed, 4 insertions(+), 1 deletion(-)
+
+--- a/drivers/net/ethernet/mediatek/mtk_wed.c
++++ b/drivers/net/ethernet/mediatek/mtk_wed.c
+@@ -1079,7 +1079,7 @@ void mtk_wed_add_hw(struct device_node *
+ 
+ 	pdev = of_find_device_by_node(np);
+ 	if (!pdev)
+-		return;
++		goto err_of_node_put;
+ 
+ 	get_device(&pdev->dev);
+ 	irq = platform_get_irq(pdev, 0);
+@@ -1139,6 +1139,8 @@ unlock:
+ 	mutex_unlock(&hw_lock);
+ err_put_device:
+ 	put_device(&pdev->dev);
++err_of_node_put:
++	of_node_put(np);
+ }
+ 
+ void mtk_wed_exit(void)
+@@ -1159,6 +1161,7 @@ void mtk_wed_exit(void)
+ 		hw_list[i] = NULL;
+ 		debugfs_remove(hw->debugfs_dir);
+ 		put_device(hw->dev);
++		of_node_put(hw->node);
+ 		kfree(hw);
+ 	}
+ }

target/linux/generic/pending-5.15/702-net-ethernet-mtk_eth_soc-enable-threaded-NAPI.patch

@@ -30,7 +30,7 @@ Signed-off-by: Felix Fietkau <nbd@nbd.name>
  	}
  
  	return IRQ_HANDLED;
-@@ -4114,6 +4114,8 @@ static int mtk_probe(struct platform_dev
+@@ -4118,6 +4118,8 @@ static int mtk_probe(struct platform_dev
  	 * for NAPI to work
  	 */
  	init_dummy_netdev(&eth->dummy_dev);