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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Meghana Malladi , Jacob Keller , Vadim Fedorenko , Himanshu Mittal , Simon Horman , Byungchul Park , Markus Elfring , linux-arm-kernel@lists.infradead.org X-Mailer: b4 0.14.2 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 --- While addressing an issue in the cpsw driver, I based my fix [1] on the implementation of the emac_ndo_set_rx_mode() function in icssg. During review, Jakub pointed out that the dedicated workqueue for the ndo_set_rx_mode callback might be unnecessary [2]. I subsequently used the system workqueue for this purpose in the cpsw driver, and it performed as expected. Therefore, I believe the same approach can be applied to the icssg driver. This patch aim to remove this dedicated workqueue for icssg drivers. Please note: I do not have access to a board that supports the CSSG PRU Ethernet controller, so this change has only been build-tested. [1] https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=c0b5dc73a38f954e780f93a549b8fe225235c07a [2] https://lore.kernel.org/all/20260127190836.6a420768@kernel.org/ --- Cc: MD Danish Anwar Cc: Roger Quadros Cc: Andrew Lunn Cc: "David S. Miller" Cc: Eric Dumazet Cc: Jakub Kicinski Cc: Paolo Abeni Cc: Meghana Malladi Cc: Jacob Keller Cc: Vadim Fedorenko Cc: Himanshu Mittal Cc: Simon Horman Cc: Byungchul Park Cc: Markus Elfring Cc: linux-arm-kernel@lists.infradead.org --- Changes in v2: - Given the issue identified by the AI [3], squash these two patches into one as suggested by Jakub. - Include the cpsw fix link and the link to Jakub's email in the cover letter, as requested by Meghana. - Link to v1: https://lore.kernel.org/r/20260204-icssg-prueth-workqueue-v1-0-9a892f4b293d@gmail.com [3] https://netdev-ai.bots.linux.dev/ai-review.html?id=02da18ab-455d-4d98-88bb-d8a975623c3f --- drivers/net/ethernet/ti/icssg/icssg_common.c | 1 - drivers/net/ethernet/ti/icssg/icssg_prueth.c | 13 ++++--------- drivers/net/ethernet/ti/icssg/icssg_prueth.h | 1 - drivers/net/ethernet/ti/icssg/icssg_prueth_sr1.c | 9 +-------- 4 files changed, 5 insertions(+), 19 deletions(-) diff --git a/drivers/net/ethernet/ti/icssg/icssg_common.c b/drivers/net/ethernet/ti/icssg/icssg_common.c index 090aa74d3ce7257ae52158b2ff9a2a1239bfcfc8..0cf9dfe0fa362b4ff986b6815952f95b79cb476d 100644 --- a/drivers/net/ethernet/ti/icssg/icssg_common.c +++ b/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; } diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth.c b/drivers/net/ethernet/ti/icssg/icssg_prueth.c index f65041662173c1968f7e70dc4a3d897523f24095..0939994c932f5322eebbaa1b2fe43e20d3dca5ae 100644 --- a/drivers/net/ethernet/ti/icssg/icssg_prueth.c +++ b/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++) { diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth.h b/drivers/net/ethernet/ti/icssg/icssg_prueth.h index 10eadd35665045a98a0c0a639606b7c2691195de..3d94fa5a7ac10992d35fdb63458f8cb6eb3a5a22 100644 --- a/drivers/net/ethernet/ti/icssg/icssg_prueth.h +++ b/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; diff --git a/drivers/net/ethernet/ti/icssg/icssg_prueth_sr1.c b/drivers/net/ethernet/ti/icssg/icssg_prueth_sr1.c index 7bb4f0d850cc72d997e5ead38cf56f1dbc2355a1..b8115ca47082f9676067bb65c6eb3a441290fd7c 100644 --- a/drivers/net/ethernet/ti/icssg/icssg_prueth_sr1.c +++ b/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; --- base-commit: 0f8a890c4524d6e4013ff225e70de2aed7e6d726 change-id: 20260203-icssg-prueth-workqueue-f460eba72132 Best regards, -- Kevin Hao