From 7234dc5ccba6e57b6b6ad19f7078e57afc40c9db Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= Date: Tue, 28 Nov 2023 18:38:25 +0100 Subject: [PATCH 1/4] net: ethernet: ti: am65-cpsw: Convert to platform remove callback returning void MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The .remove() callback for a platform driver returns an int which makes many driver authors wrongly assume it's possible to do error handling by returning an error code. However the value returned is ignored (apart from emitting a warning) and this typically results in resource leaks. To improve here there is a quest to make the remove callback return void. In the first step of this quest all drivers are converted to .remove_new(), which already returns void. Eventually after all drivers are converted, .remove_new() will be renamed to .remove(). Replace the error path returning a non-zero value by an error message and a comment that there is more to do. With that this patch results in no change of behaviour in this driver apart from improving the error message. Signed-off-by: Uwe Kleine-König Reviewed-by: Roger Quadros Signed-off-by: Paolo Abeni --- drivers/net/ethernet/ti/am65-cpsw-nuss.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c index 7992a76ed4d8..7651f90f51f2 100644 --- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c +++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c @@ -3028,7 +3028,7 @@ err_pm_clear: return ret; } -static int am65_cpsw_nuss_remove(struct platform_device *pdev) +static void am65_cpsw_nuss_remove(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct am65_cpsw_common *common; @@ -3037,8 +3037,14 @@ static int am65_cpsw_nuss_remove(struct platform_device *pdev) common = dev_get_drvdata(dev); ret = pm_runtime_resume_and_get(&pdev->dev); - if (ret < 0) - return ret; + if (ret < 0) { + /* Note, if this error path is taken, we're leaking some + * resources. + */ + dev_err(&pdev->dev, "Failed to resume device (%pe)\n", + ERR_PTR(ret)); + return; + } am65_cpsw_unregister_devlink(common); am65_cpsw_unregister_notifiers(common); @@ -3056,7 +3062,6 @@ static int am65_cpsw_nuss_remove(struct platform_device *pdev) pm_runtime_put_sync(&pdev->dev); pm_runtime_disable(&pdev->dev); - return 0; } static int am65_cpsw_nuss_suspend(struct device *dev) @@ -3156,7 +3161,7 @@ static struct platform_driver am65_cpsw_nuss_driver = { .pm = &am65_cpsw_nuss_dev_pm_ops, }, .probe = am65_cpsw_nuss_probe, - .remove = am65_cpsw_nuss_remove, + .remove_new = am65_cpsw_nuss_remove, }; module_platform_driver(am65_cpsw_nuss_driver); From 7ac3f867a35833a228b1bd9645a1581c808a5900 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= Date: Tue, 28 Nov 2023 18:38:26 +0100 Subject: [PATCH 2/4] net: ethernet: ti: cpsw: Convert to platform remove callback returning void MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The .remove() callback for a platform driver returns an int which makes many driver authors wrongly assume it's possible to do error handling by returning an error code. However the value returned is ignored (apart from emitting a warning) and this typically results in resource leaks. To improve here there is a quest to make the remove callback return void. In the first step of this quest all drivers are converted to .remove_new(), which already returns void. Eventually after all drivers are converted, .remove_new() will be renamed to .remove(). Replace the error path returning a non-zero value by an error message and a comment that there is more to do. With that this patch results in no change of behaviour in this driver apart from improving the error message. Signed-off-by: Uwe Kleine-König Reviewed-by: Roger Quadros Signed-off-by: Paolo Abeni --- drivers/net/ethernet/ti/cpsw.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c index ca4d4548f85e..ea85c6dd5484 100644 --- a/drivers/net/ethernet/ti/cpsw.c +++ b/drivers/net/ethernet/ti/cpsw.c @@ -1722,14 +1722,20 @@ clean_runtime_disable_ret: return ret; } -static int cpsw_remove(struct platform_device *pdev) +static void cpsw_remove(struct platform_device *pdev) { struct cpsw_common *cpsw = platform_get_drvdata(pdev); int i, ret; ret = pm_runtime_resume_and_get(&pdev->dev); - if (ret < 0) - return ret; + if (ret < 0) { + /* Note, if this error path is taken, we're leaking some + * resources. + */ + dev_err(&pdev->dev, "Failed to resume device (%pe)\n", + ERR_PTR(ret)); + return; + } for (i = 0; i < cpsw->data.slaves; i++) if (cpsw->slaves[i].ndev) @@ -1740,7 +1746,6 @@ static int cpsw_remove(struct platform_device *pdev) cpsw_remove_dt(pdev); pm_runtime_put_sync(&pdev->dev); pm_runtime_disable(&pdev->dev); - return 0; } #ifdef CONFIG_PM_SLEEP @@ -1795,7 +1800,7 @@ static struct platform_driver cpsw_driver = { .of_match_table = cpsw_of_mtable, }, .probe = cpsw_probe, - .remove = cpsw_remove, + .remove_new = cpsw_remove, }; module_platform_driver(cpsw_driver); From a76772e2fd83e97a8d1bd363e986fc842ad31446 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= Date: Tue, 28 Nov 2023 18:38:27 +0100 Subject: [PATCH 3/4] net: ethernet: ti: cpsw-new: Convert to platform remove callback returning void MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The .remove() callback for a platform driver returns an int which makes many driver authors wrongly assume it's possible to do error handling by returning an error code. However the value returned is ignored (apart from emitting a warning) and this typically results in resource leaks. To improve here there is a quest to make the remove callback return void. In the first step of this quest all drivers are converted to .remove_new(), which already returns void. Eventually after all drivers are converted, .remove_new() will be renamed to .remove(). Replace the error path returning a non-zero value by an error message and a comment that there is more to do. With that this patch results in no change of behaviour in this driver apart from improving the error message. Signed-off-by: Uwe Kleine-König Reviewed-by: Roger Quadros Signed-off-by: Paolo Abeni --- drivers/net/ethernet/ti/cpsw_new.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/ti/cpsw_new.c b/drivers/net/ethernet/ti/cpsw_new.c index 0e4f526b1753..498c50c6d1a7 100644 --- a/drivers/net/ethernet/ti/cpsw_new.c +++ b/drivers/net/ethernet/ti/cpsw_new.c @@ -2037,14 +2037,20 @@ clean_dt_ret: return ret; } -static int cpsw_remove(struct platform_device *pdev) +static void cpsw_remove(struct platform_device *pdev) { struct cpsw_common *cpsw = platform_get_drvdata(pdev); int ret; ret = pm_runtime_resume_and_get(&pdev->dev); - if (ret < 0) - return ret; + if (ret < 0) { + /* Note, if this error path is taken, we're leaking some + * resources. + */ + dev_err(&pdev->dev, "Failed to resume device (%pe)\n", + ERR_PTR(ret)); + return; + } cpsw_unregister_notifiers(cpsw); cpsw_unregister_devlink(cpsw); @@ -2055,7 +2061,6 @@ static int cpsw_remove(struct platform_device *pdev) cpsw_remove_dt(cpsw); pm_runtime_put_sync(&pdev->dev); pm_runtime_disable(&pdev->dev); - return 0; } static int __maybe_unused cpsw_suspend(struct device *dev) @@ -2116,7 +2121,7 @@ static struct platform_driver cpsw_driver = { .of_match_table = cpsw_of_mtable, }, .probe = cpsw_probe, - .remove = cpsw_remove, + .remove_new = cpsw_remove, }; module_platform_driver(cpsw_driver); From 7ec1bb2ce64ba9528b1f67bf489dd5f6147d1f64 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= Date: Tue, 28 Nov 2023 18:38:28 +0100 Subject: [PATCH 4/4] net: ethernet: ezchip: Convert to platform remove callback returning void MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The .remove() callback for a platform driver returns an int which makes many driver authors wrongly assume it's possible to do error handling by returning an error code. However the value returned is ignored (apart from emitting a warning) and this typically results in resource leaks. To improve here there is a quest to make the remove callback return void. In the first step of this quest all drivers are converted to .remove_new(), which already returns void. Eventually after all drivers are converted, .remove_new() will be renamed to .remove(). Trivially convert this driver from always returning zero in the remove callback to the void returning variant. Signed-off-by: Uwe Kleine-König Signed-off-by: Paolo Abeni --- drivers/net/ethernet/ezchip/nps_enet.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/ezchip/nps_enet.c b/drivers/net/ethernet/ezchip/nps_enet.c index 4d7184d46824..07c2b701b5fa 100644 --- a/drivers/net/ethernet/ezchip/nps_enet.c +++ b/drivers/net/ethernet/ezchip/nps_enet.c @@ -633,7 +633,7 @@ out_netdev: return err; } -static s32 nps_enet_remove(struct platform_device *pdev) +static void nps_enet_remove(struct platform_device *pdev) { struct net_device *ndev = platform_get_drvdata(pdev); struct nps_enet_priv *priv = netdev_priv(ndev); @@ -641,8 +641,6 @@ static s32 nps_enet_remove(struct platform_device *pdev) unregister_netdev(ndev); netif_napi_del(&priv->napi); free_netdev(ndev); - - return 0; } static const struct of_device_id nps_enet_dt_ids[] = { @@ -653,7 +651,7 @@ MODULE_DEVICE_TABLE(of, nps_enet_dt_ids); static struct platform_driver nps_enet_driver = { .probe = nps_enet_probe, - .remove = nps_enet_remove, + .remove_new = nps_enet_remove, .driver = { .name = DRV_NAME, .of_match_table = nps_enet_dt_ids,