net: ethernet: mtk_eth_soc: fix memory leak in error path

In mtk_ppe_init(), when dmam_alloc_coherent() or devm_kzalloc() failed,
the rhashtable ppe->l2_flows isn't destroyed. Fix it.

In mtk_probe(), when mtk_ppe_init() or mtk_eth_offload_init() or
register_netdev() failed, have the same problem. Fix it.

Fixes: 33fc42de ("net: ethernet: mtk_eth_soc: support creating mac address based offload entries")
Signed-off-by: Yan Cangang <nalanzeyu@gmail.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/mediatek/mtk_eth_soc.c

@@ -4147,13 +4147,13 @@ static int mtk_probe(struct platform_device *pdev)
 						   eth->soc->offload_version, i);
 			if (!eth->ppe[i]) {
 				err = -ENOMEM;
-				goto err_deinit_mdio;
+				goto err_deinit_ppe;
 			}
 		}
 
 		err = mtk_eth_offload_init(eth);
 		if (err)
-			goto err_deinit_mdio;
+			goto err_deinit_ppe;
 	}
 
 	for (i = 0; i < MTK_MAX_DEVS; i++) {
@@ -4163,7 +4163,7 @@ static int mtk_probe(struct platform_device *pdev)
 		err = register_netdev(eth->netdev[i]);
 		if (err) {
 			dev_err(eth->dev, "error bringing up device\n");
-			goto err_deinit_mdio;
+			goto err_deinit_ppe;
 		} else
 			netif_info(eth, probe, eth->netdev[i],
 				   "mediatek frame engine at 0x%08lx, irq %d\n",
@@ -4181,7 +4181,8 @@ static int mtk_probe(struct platform_device *pdev)
 
 	return 0;
 
-err_deinit_mdio:
+err_deinit_ppe:
+	mtk_ppe_deinit(eth);
 	mtk_mdio_cleanup(eth);
 err_free_dev:
 	mtk_free_dev(eth);

drivers/net/ethernet/mediatek/mtk_ppe.c

@@ -737,7 +737,7 @@ struct mtk_ppe *mtk_ppe_init(struct mtk_eth *eth, void __iomem *base,
 				  MTK_PPE_ENTRIES * soc->foe_entry_size,
 				  &ppe->foe_phys, GFP_KERNEL);
 	if (!foe)
-		return NULL;
+		goto err_free_l2_flows;
 
 	ppe->foe_table = foe;
 
@@ -745,11 +745,26 @@ struct mtk_ppe *mtk_ppe_init(struct mtk_eth *eth, void __iomem *base,
 			sizeof(*ppe->foe_flow);
 	ppe->foe_flow = devm_kzalloc(dev, foe_flow_size, GFP_KERNEL);
 	if (!ppe->foe_flow)
-		return NULL;
+		goto err_free_l2_flows;
 
 	mtk_ppe_debugfs_init(ppe, index);
 
 	return ppe;
+
+err_free_l2_flows:
+	rhashtable_destroy(&ppe->l2_flows);
+	return NULL;
+}
+
+void mtk_ppe_deinit(struct mtk_eth *eth)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(eth->ppe); i++) {
+		if (!eth->ppe[i])
+			return;
+		rhashtable_destroy(&eth->ppe[i]->l2_flows);
+	}
 }
 
 static void mtk_ppe_init_foe_table(struct mtk_ppe *ppe)

drivers/net/ethernet/mediatek/mtk_ppe.h

@@ -304,6 +304,7 @@ struct mtk_ppe {
 
 struct mtk_ppe *mtk_ppe_init(struct mtk_eth *eth, void __iomem *base,
 			     int version, int index);
+void mtk_ppe_deinit(struct mtk_eth *eth);
 void mtk_ppe_start(struct mtk_ppe *ppe);
 int mtk_ppe_stop(struct mtk_ppe *ppe);