From patchwork Thu Nov 26 11:01:40 2020 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: 333833 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 68256C56202 for ; Thu, 26 Nov 2020 11:02:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 19C4721D1A for ; Thu, 26 Nov 2020 11:02:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729740AbgKZLCE (ORCPT ); Thu, 26 Nov 2020 06:02:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33756 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729663AbgKZLCD (ORCPT ); Thu, 26 Nov 2020 06:02:03 -0500 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 AC41BC0613D4 for ; Thu, 26 Nov 2020 03:02:03 -0800 (PST) Received: from pty.hi.pengutronix.de ([2001:67c:670:100:1d::c5]) by metis.ext.pengutronix.de with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kiF25-0000P7-N2; Thu, 26 Nov 2020 12:01:49 +0100 Received: from ukl by pty.hi.pengutronix.de with local (Exim 4.89) (envelope-from ) id 1kiF23-00052Z-Ke; Thu, 26 Nov 2020 12:01:47 +0100 From: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= To: Russell King , Dmitry Torokhov , Lee Jones , Daniel Thompson , Jingoo Han , Bartlomiej Zolnierkiewicz Cc: linux-arm-kernel@lists.infradead.org, linux-input@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, kernel@pengutronix.de Subject: [PATCH] ARM: locomo: make locomo bus's remove callback return void Date: Thu, 26 Nov 2020 12:01:40 +0100 Message-Id: <20201126110140.2021758-1-u.kleine-koenig@pengutronix.de> X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2001:67c:670:100:1d::c5 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-fbdev@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org The driver core ignores the return value of struct bus_type::remove because there is only little that can be done. To simplify the quest to make this function return void, let struct locomo_driver::remove return void, too. All users already unconditionally return 0, this commit makes it obvious that returning an error code is a bad idea and ensures future users behave accordingly. Signed-off-by: Uwe Kleine-König --- Hello, if desired the change to arch/arm/mach-sa1100/collie.c can be split out of this patch. The change of prototype then doesn't affect this driver any more. There is one locomo-driver that is already now unaffected: drivers/leds/leds-locomo.c. This driver doesn't have a remove callback. Best regards Uwe arch/arm/common/locomo.c | 5 ++--- arch/arm/include/asm/hardware/locomo.h | 2 +- arch/arm/mach-sa1100/collie.c | 6 ------ drivers/input/keyboard/locomokbd.c | 4 +--- drivers/video/backlight/locomolcd.c | 3 +-- 5 files changed, 5 insertions(+), 15 deletions(-) diff --git a/arch/arm/common/locomo.c b/arch/arm/common/locomo.c index 62f241b09fe3..e45f4e4e06b6 100644 --- a/arch/arm/common/locomo.c +++ b/arch/arm/common/locomo.c @@ -838,11 +838,10 @@ static int locomo_bus_remove(struct device *dev) { struct locomo_dev *ldev = LOCOMO_DEV(dev); struct locomo_driver *drv = LOCOMO_DRV(dev->driver); - int ret = 0; if (drv->remove) - ret = drv->remove(ldev); - return ret; + drv->remove(ldev); + return 0; } struct bus_type locomo_bus_type = { diff --git a/arch/arm/include/asm/hardware/locomo.h b/arch/arm/include/asm/hardware/locomo.h index f8712e3c29cf..246a3de25931 100644 --- a/arch/arm/include/asm/hardware/locomo.h +++ b/arch/arm/include/asm/hardware/locomo.h @@ -188,7 +188,7 @@ struct locomo_driver { struct device_driver drv; unsigned int devid; int (*probe)(struct locomo_dev *); - int (*remove)(struct locomo_dev *); + void (*remove)(struct locomo_dev *); }; #define LOCOMO_DRV(_d) container_of((_d), struct locomo_driver, drv) diff --git a/arch/arm/mach-sa1100/collie.c b/arch/arm/mach-sa1100/collie.c index bd3a52fd09ce..f43beb7b25c7 100644 --- a/arch/arm/mach-sa1100/collie.c +++ b/arch/arm/mach-sa1100/collie.c @@ -204,18 +204,12 @@ static int collie_uart_probe(struct locomo_dev *dev) return 0; } -static int collie_uart_remove(struct locomo_dev *dev) -{ - return 0; -} - static struct locomo_driver collie_uart_driver = { .drv = { .name = "collie_uart", }, .devid = LOCOMO_DEVID_UART, .probe = collie_uart_probe, - .remove = collie_uart_remove, }; static int __init collie_uart_init(void) diff --git a/drivers/input/keyboard/locomokbd.c b/drivers/input/keyboard/locomokbd.c index daf6a753ca61..dae053596572 100644 --- a/drivers/input/keyboard/locomokbd.c +++ b/drivers/input/keyboard/locomokbd.c @@ -304,7 +304,7 @@ static int locomokbd_probe(struct locomo_dev *dev) return err; } -static int locomokbd_remove(struct locomo_dev *dev) +static void locomokbd_remove(struct locomo_dev *dev) { struct locomokbd *locomokbd = locomo_get_drvdata(dev); @@ -318,8 +318,6 @@ static int locomokbd_remove(struct locomo_dev *dev) release_mem_region((unsigned long) dev->mapbase, dev->length); kfree(locomokbd); - - return 0; } static struct locomo_driver keyboard_driver = { diff --git a/drivers/video/backlight/locomolcd.c b/drivers/video/backlight/locomolcd.c index 297ee2e1ab0b..0468ea82159f 100644 --- a/drivers/video/backlight/locomolcd.c +++ b/drivers/video/backlight/locomolcd.c @@ -208,7 +208,7 @@ static int locomolcd_probe(struct locomo_dev *ldev) return 0; } -static int locomolcd_remove(struct locomo_dev *dev) +static void locomolcd_remove(struct locomo_dev *dev) { unsigned long flags; @@ -220,7 +220,6 @@ static int locomolcd_remove(struct locomo_dev *dev) local_irq_save(flags); locomolcd_dev = NULL; local_irq_restore(flags); - return 0; } static struct locomo_driver poodle_lcd_driver = {