From patchwork Tue Nov 28 17:38:26 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= X-Patchwork-Id: 13471464 Authentication-Results: smtp.subspace.kernel.org; dkim=none Received: from metis.whiteo.stw.pengutronix.de (metis.whiteo.stw.pengutronix.de [IPv6:2a0a:edc0:2:b01:1d::104]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 288AEDC for ; Tue, 28 Nov 2023 09:38:58 -0800 (PST) Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1r822j-00064Q-Ta; Tue, 28 Nov 2023 18:38:41 +0100 Received: from [2a0a:edc0:0:900:1d::77] (helo=ptz.office.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1r822g-00CECf-AB; Tue, 28 Nov 2023 18:38:38 +0100 Received: from ukl by ptz.office.stw.pengutronix.de with local (Exim 4.94.2) (envelope-from ) id 1r822g-00AIhd-0l; Tue, 28 Nov 2023 18:38:38 +0100 From: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= To: Roger Quadros , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: Siddharth Vadapalli , Ravi Gunasekaran , Jesse Brandeburg , Rob Herring , Yunsheng Lin , Marek Majtyka , linux-omap@vger.kernel.org, netdev@vger.kernel.org, kernel@pengutronix.de Subject: [PATCH net-next v2 2/4] net: ethernet: ti: cpsw: Convert to platform remove callback returning void Date: Tue, 28 Nov 2023 18:38:26 +0100 Message-ID: <20231128173823.867512-3-u.kleine-koenig@pengutronix.de> X-Mailer: git-send-email 2.42.0.586.gbc5204569f7d.dirty In-Reply-To: <20231128173823.867512-1-u.kleine-koenig@pengutronix.de> References: <20231128173823.867512-1-u.kleine-koenig@pengutronix.de> Precedence: bulk X-Mailing-List: linux-omap@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2281; i=u.kleine-koenig@pengutronix.de; h=from:subject; bh=9UcfSFjhUEfd6nnCPak0CK/9KmxcCySOGQOziPhXmLM=; b=owGbwMvMwMXY3/A7olbonx/jabUkhtQ01UlHFQrTnJNlait1GwOeGD+/ptzZuXR/6EfPz56lv DIsFUqdjMYsDIxcDLJiiiz2jWsyrarkIjvX/rsMM4iVCWQKAxenAEykwZ+DoVWofP2PgPcfStm0 InOCrVfvaVxbamzz3X5r4s3W17Vqi+8ryPrqJWiaPdzWr+Olsj8lK8dWbv2MTxLZkfIvdUuTHta Yiop+CuE6ovDH+PihWC/7f+1iwV+v/pj7xO1L9XObSTJbDl6eo3XAfcLhuXe/bG52YOdlCdjX6C 6j9+cjr3yKyJ3cr4ZPXnW4vHuw9UrdzAmiPlO2ywYuSdRyaNvNpeTmNUGJZf1b56Jp/Wv+s8TdS RJ87TC3rX+T5bQax1lF6lxufDMvmBrqXxLSK/zHF8R4LmTBnqg3AZ0TPYXXfkk4qxcYYJuSX8jb c9Vl3oSNQXMWFXukJ7l2/2U9qj5Tx8vgJotFSffnNm4A X-Developer-Key: i=u.kleine-koenig@pengutronix.de; a=openpgp; fpr=0D2511F322BFAB1C1580266BE2DCDD9132669BD6 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: ukl@pengutronix.de X-SA-Exim-Scanned: No (on metis.whiteo.stw.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-omap@vger.kernel.org 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 --- 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 @@ static int cpsw_probe(struct platform_device *pdev) 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 patchwork Tue Nov 28 17:38:27 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= X-Patchwork-Id: 13471462 Authentication-Results: smtp.subspace.kernel.org; dkim=none Received: from metis.whiteo.stw.pengutronix.de (metis.whiteo.stw.pengutronix.de [IPv6:2a0a:edc0:2:b01:1d::104]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E040310A for ; Tue, 28 Nov 2023 09:38:56 -0800 (PST) Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1r822j-00064R-TZ; Tue, 28 Nov 2023 18:38:41 +0100 Received: from [2a0a:edc0:0:900:1d::77] (helo=ptz.office.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1r822g-00CECi-GN; Tue, 28 Nov 2023 18:38:38 +0100 Received: from ukl by ptz.office.stw.pengutronix.de with local (Exim 4.94.2) (envelope-from ) id 1r822g-00AIhh-6n; Tue, 28 Nov 2023 18:38:38 +0100 From: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= To: Roger Quadros , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: Siddharth Vadapalli , Ravi Gunasekaran , Kumar Kartikeya Dwivedi , Stanislav Fomichev , Marek Majtyka , Simon Horman , Rob Herring , Yunsheng Lin , linux-omap@vger.kernel.org, netdev@vger.kernel.org, kernel@pengutronix.de Subject: [PATCH net-next v2 3/4] net: ethernet: ti: cpsw-new: Convert to platform remove callback returning void Date: Tue, 28 Nov 2023 18:38:27 +0100 Message-ID: <20231128173823.867512-4-u.kleine-koenig@pengutronix.de> X-Mailer: git-send-email 2.42.0.586.gbc5204569f7d.dirty In-Reply-To: <20231128173823.867512-1-u.kleine-koenig@pengutronix.de> References: <20231128173823.867512-1-u.kleine-koenig@pengutronix.de> Precedence: bulk X-Mailing-List: linux-omap@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2331; i=u.kleine-koenig@pengutronix.de; h=from:subject; bh=0WluJN1qBPA0owL1Rg+ZIRaCjcfxvLqaIsOTcVcTtsM=; b=owEBbQGS/pANAwAKAY+A+1h9Ev5OAcsmYgBlZiWTKbBB/c3YoRuYx79+9DNd5c6/yLmHeLAvf H8lpS3sdEeJATMEAAEKAB0WIQQ/gaxpOnoeWYmt/tOPgPtYfRL+TgUCZWYlkwAKCRCPgPtYfRL+ TizpCACtv8OLoaE3NfgcnbxFwezaage8NzjgKkVRUSHuN6KvZEExVBlth3G61Qjt4rExjwrCkGx 3njK7Pp4xq4A/qiu67ikVrnQlfdvEvkkAJ1RPjYjm7HfjKv4kmEW2hjKbK8GmIxTqyIOUlJTdON WOUxCGT8K8oumgdrqACvexJulv3Nz7TM/qMjYoQmABAPsW/L9tY41AbkLzOQUWMI6ySBo0Dn/Ew TVvGis3+I9X7lNVgzre8RGSvjz+QTQUDMkd9iMf4noLSchGzy9qDqPSaU1CpZnCjpNv0m3GAKDi 6GJ/W5KwX4kq/0XGv+SeO++XLBo/yyRdHYlLp2WesrnlxnPa X-Developer-Key: i=u.kleine-koenig@pengutronix.de; a=openpgp; fpr=0D2511F322BFAB1C1580266BE2DCDD9132669BD6 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: ukl@pengutronix.de X-SA-Exim-Scanned: No (on metis.whiteo.stw.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-omap@vger.kernel.org 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 --- 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 @@ static int cpsw_probe(struct platform_device *pdev) 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);