net: ti: icssg: Remove dedicated workqueue for ndo_set_rx_mode callback

Currently, both the icssg-prueth and icssg-prueth-sr1 drivers create
a dedicated 'emac->cmd_wq' workqueue.

In the icssg-prueth-sr1 driver, this workqueue is not utilized at all.

In the icssg-prueth driver, the workqueue is only used to execute the
actual processing of ndo_set_rx_mode. However, creating a dedicated
workqueue for such a simple use case is unnecessary. To simplify the
code, switch to using the system default workqueue instead.

Signed-off-by: Kevin Hao <haokexin@gmail.com>
Tested-by: Meghana Malladi <m-malladi@ti.com>
Reviewed-by: MD Danish Anwar <danishanwar@ti.com>
Link: https://patch.msgid.link/20260205-icssg-prueth-workqueue-v2-1-cf5cf97efb37@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: haokexin

drivers/net/ethernet/ti/icssg/icssg_common.c

@@ -1720,7 +1720,6 @@ void prueth_netdev_exit(struct prueth *prueth,
 	netif_napi_del(&emac->napi_rx);
 
 	pruss_release_mem_region(prueth->pruss, &emac->dram);
-	destroy_workqueue(emac->cmd_wq);
 	free_netdev(emac->ndev);
 	prueth->emac[mac] = NULL;
 }

drivers/net/ethernet/ti/icssg/icssg_prueth.c

@@ -1099,7 +1099,7 @@ static void emac_ndo_set_rx_mode(struct net_device *ndev)
 {
 	struct prueth_emac *emac = netdev_priv(ndev);
 
-	queue_work(emac->cmd_wq, &emac->rx_mode_work);
+	schedule_work(&emac->rx_mode_work);
 }
 
 static netdev_features_t emac_ndo_fix_features(struct net_device *ndev,
@@ -1451,11 +1451,6 @@ static int prueth_netdev_init(struct prueth *prueth,
 	emac->port_id = port;
 	emac->xdp_prog = NULL;
 	emac->ndev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
-	emac->cmd_wq = create_singlethread_workqueue("icssg_cmd_wq");
-	if (!emac->cmd_wq) {
-		ret = -ENOMEM;
-		goto free_ndev;
-	}
 	INIT_WORK(&emac->rx_mode_work, emac_ndo_set_rx_mode_work);
 
 	INIT_DELAYED_WORK(&emac->stats_work, icssg_stats_work_handler);
@@ -1467,7 +1462,7 @@ static int prueth_netdev_init(struct prueth *prueth,
 	if (ret) {
 		dev_err(prueth->dev, "unable to get DRAM: %d\n", ret);
 		ret = -ENOMEM;
-		goto free_wq;
+		goto free_ndev;
 	}
 
 	emac->tx_ch_num = 1;
@@ -1566,8 +1561,6 @@ static int prueth_netdev_init(struct prueth *prueth,
 
 free:
 	pruss_release_mem_region(prueth->pruss, &emac->dram);
-free_wq:
-	destroy_workqueue(emac->cmd_wq);
 free_ndev:
 	emac->ndev = NULL;
 	prueth->emac[mac] = NULL;
@@ -2236,6 +2229,7 @@ static int prueth_probe(struct platform_device *pdev)
 			prueth->emac[i]->ndev->phydev = NULL;
 		}
 		unregister_netdev(prueth->registered_netdevs[i]);
+		disable_work_sync(&prueth->emac[i]->rx_mode_work);
 	}
 
 netdev_exit:
@@ -2295,6 +2289,7 @@ static void prueth_remove(struct platform_device *pdev)
 		phy_disconnect(prueth->emac[i]->ndev->phydev);
 		prueth->emac[i]->ndev->phydev = NULL;
 		unregister_netdev(prueth->registered_netdevs[i]);
+		disable_work_sync(&prueth->emac[i]->rx_mode_work);
 	}
 
 	for (i = 0; i < PRUETH_NUM_MACS; i++) {

drivers/net/ethernet/ti/icssg/icssg_prueth.h

@@ -236,7 +236,6 @@ struct prueth_emac {
 	/* Mutex to serialize access to firmware command interface */
 	struct mutex cmd_lock;
 	struct work_struct rx_mode_work;
-	struct workqueue_struct	*cmd_wq;
 
 	struct pruss_mem_region dram;
 

drivers/net/ethernet/ti/icssg/icssg_prueth_sr1.c

@@ -783,11 +783,6 @@ static int prueth_netdev_init(struct prueth *prueth,
 	emac->prueth = prueth;
 	emac->ndev = ndev;
 	emac->port_id = port;
-	emac->cmd_wq = create_singlethread_workqueue("icssg_cmd_wq");
-	if (!emac->cmd_wq) {
-		ret = -ENOMEM;
-		goto free_ndev;
-	}
 
 	INIT_DELAYED_WORK(&emac->stats_work, icssg_stats_work_handler);
 
@@ -798,7 +793,7 @@ static int prueth_netdev_init(struct prueth *prueth,
 	if (ret) {
 		dev_err(prueth->dev, "unable to get DRAM: %d\n", ret);
 		ret = -ENOMEM;
-		goto free_wq;
+		goto free_ndev;
 	}
 
 	/* SR1.0 uses a dedicated high priority channel
@@ -883,8 +878,6 @@ static int prueth_netdev_init(struct prueth *prueth,
 
 free:
 	pruss_release_mem_region(prueth->pruss, &emac->dram);
-free_wq:
-	destroy_workqueue(emac->cmd_wq);
 free_ndev:
 	emac->ndev = NULL;
 	prueth->emac[mac] = NULL;