From patchwork Sun Jul 9 16:33:35 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: 700997 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 274C1EB64DD for ; Sun, 9 Jul 2023 16:34:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230313AbjGIQeJ (ORCPT ); Sun, 9 Jul 2023 12:34:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59784 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229534AbjGIQeI (ORCPT ); Sun, 9 Jul 2023 12:34:08 -0400 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0FE61D1 for ; Sun, 9 Jul 2023 09:34:06 -0700 (PDT) Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1qIXM7-0001sl-4H; Sun, 09 Jul 2023 18:33:51 +0200 Received: from [2a0a:edc0:0:900:1d::77] (helo=ptz.office.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.94.2) (envelope-from ) id 1qIXM4-00DE3K-KZ; Sun, 09 Jul 2023 18:33:48 +0200 Received: from ukl by ptz.office.stw.pengutronix.de with local (Exim 4.94.2) (envelope-from ) id 1qIXM3-003ZSr-J6; Sun, 09 Jul 2023 18:33:47 +0200 From: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= To: Chunfeng Yun , Greg Kroah-Hartman Cc: linux-usb@vger.kernel.org, linux-mediatek@lists.infradead.org, kernel@pengutronix.de Subject: [PATCH] usb: mtu3: Convert to platform remove callback returning void Date: Sun, 9 Jul 2023 18:33:35 +0200 Message-Id: <20230709163335.3458886-1-u.kleine-koenig@pengutronix.de> X-Mailer: git-send-email 2.39.2 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2295; i=u.kleine-koenig@pengutronix.de; h=from:subject; bh=/T81r6WMwxUmMRasfxa3EFZ+33Itiuk1lnEmTTIiUEE=; b=owEBbQGS/pANAwAKAY+A+1h9Ev5OAcsmYgBkquFeaWYzHB0WPRXpdx3gj8S2IYC/Tb6hepJB1 5si0hE78zyJATMEAAEKAB0WIQQ/gaxpOnoeWYmt/tOPgPtYfRL+TgUCZKrhXgAKCRCPgPtYfRL+ TtB3CACqUHCt0leatj03pGWzZcvTc7K7duu3YsJl9lvMXFRPBFSuX/URjSb0jT7nr0FfXYKh3/g seOqPRKvDqfdgDZUAZqKBG/O4G/3wwvl0+drPI8zXz9aNs7jF8Wqk0jbB+koZsUyq9rQqA1bE5j ILN/9NZW58jpKMvwRervrT1nttwDo0DIJyBCu92iMLwrovFFF0uQk3kMulHihpY0Ob9K11fpR3V IsdWmfQjOdBSDczX+GdspxQzpy5KViD7JcbIDtKA2yDsgoJPALhuTqIT91UmDHqqcEyevyCTOp5 W6tXo5XsL1Tp8COTPAccBbscIH/oefZlDOube+CCXlr/7lkd 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.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-usb@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@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 (mostly) ignored 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. The function mtu3_remove() can only return a non-zero value if ssusb->dr_mode is neiter USB_DR_MODE_PERIPHERAL nor USB_DR_MODE_HOST nor USB_DR_MODE_OTG. In this case however the probe callback doesn't succeed and so the remove callback isn't called at all. So the code branch resulting in this error path can just be dropped and then mtu3_remove() be converted to return void trivially. Signed-off-by: Uwe Kleine-König --- drivers/usb/mtu3/mtu3_plat.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) base-commit: 1c7873e3364570ec89343ff4877e0f27a7b21a61 diff --git a/drivers/usb/mtu3/mtu3_plat.c b/drivers/usb/mtu3/mtu3_plat.c index 6f264b129243..cc53bfa25b23 100644 --- a/drivers/usb/mtu3/mtu3_plat.c +++ b/drivers/usb/mtu3/mtu3_plat.c @@ -451,7 +451,7 @@ static int mtu3_probe(struct platform_device *pdev) return ret; } -static int mtu3_remove(struct platform_device *pdev) +static void mtu3_remove(struct platform_device *pdev) { struct ssusb_mtk *ssusb = platform_get_drvdata(pdev); @@ -469,8 +469,6 @@ static int mtu3_remove(struct platform_device *pdev) ssusb_gadget_exit(ssusb); ssusb_host_exit(ssusb); break; - default: - return -EINVAL; } ssusb_rscs_exit(ssusb); @@ -478,8 +476,6 @@ static int mtu3_remove(struct platform_device *pdev) pm_runtime_disable(&pdev->dev); pm_runtime_put_noidle(&pdev->dev); pm_runtime_set_suspended(&pdev->dev); - - return 0; } static int resume_ip_and_ports(struct ssusb_mtk *ssusb, pm_message_t msg) @@ -615,7 +611,7 @@ MODULE_DEVICE_TABLE(of, mtu3_of_match); static struct platform_driver mtu3_driver = { .probe = mtu3_probe, - .remove = mtu3_remove, + .remove_new = mtu3_remove, .driver = { .name = MTU3_DRIVER_NAME, .pm = DEV_PM_OPS,