From patchwork Mon Apr 8 19:38:42 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guenter Roeck X-Patchwork-Id: 10890017 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 353F41805 for ; Mon, 8 Apr 2019 19:40:30 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1E89A28595 for ; Mon, 8 Apr 2019 19:40:30 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 126C9285A4; Mon, 8 Apr 2019 19:40:30 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 725D3286FE for ; Mon, 8 Apr 2019 19:40:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729045AbfDHTkE (ORCPT ); Mon, 8 Apr 2019 15:40:04 -0400 Received: from mail-pg1-f193.google.com ([209.85.215.193]:37208 "EHLO mail-pg1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729042AbfDHTkD (ORCPT ); Mon, 8 Apr 2019 15:40:03 -0400 Received: by mail-pg1-f193.google.com with SMTP id e6so7881049pgc.4; Mon, 08 Apr 2019 12:40:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references; bh=7THh9qsnCmidCNLaJzA4Mcp6adtL0OU5E3d8WEfwEdg=; b=hsNB/CZn/LdC5lYgP1F5SKG++4XATZEIpPQ4fS2xvzKgvl81GfVqB7kvW/L/pSXPCz JqWPIjo13jDes7CVn/MwT44NMRNr+CJGrBnTYtVMHBEv+0bhEgY+Gq87zElTQvc1IFcn Z+JH8X+NrqMvoKplyuEXuMmV8v8w22ixmHkxmSAo99vNeOERE0YAiPT+GBM9cFu77vPQ LUU+5WegxsVaaVw/whOpWx+UaGupUOWKSqJFTSfPr63PGWy1xYag7dNChnIl2VUipuXM fizS/f5hHShZeDfobIoRSxBin83trhsX5B2BJV89+PukPcGwfTgwPTctZURt+ccPOh4i 1dqQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :in-reply-to:references; bh=7THh9qsnCmidCNLaJzA4Mcp6adtL0OU5E3d8WEfwEdg=; b=N6sK1MTABBr4/SA3xi+UkYwtGC3avfd+qlDkPguHC2dLOdA6om+LGrbsMeib5TI5Cv 9kXd7nr6dV3kU1HDYSLcTiSuMieBULhZF3F1DMVSka+CCGzveLrQDCNLmUqoWcw3/H+1 //3+tFXkjC4qsCPm26cWhfWG5qJpCwxU73AmUgLVxUTaqdX2tSFS/y3E/xTR5UWSP04T RLnaTAzXeVe9SPF62HQdrIfcfIpndctuX3/ncxKK3LMKWBNgaBlt1SQIjPyIpgehXWtG 6qMD+jtYkaR67niIw4kxPj8z3bVXG8Msnd6aQyQEMNPZrwo7GWf5UFatucYrvgAwrhYR hrsA== X-Gm-Message-State: APjAAAUKqJSIrlbjzfXyCveJuX54ucYPvhzBhkW4CtY6/oRo+LZHG/wy ogUw3IlFWAb3sa2Ths/ZgdQ= X-Google-Smtp-Source: APXvYqyA7yGKHn60b8Hc0KAj6jwBPG5avvELRuvuYKb5+A3mb4iiRg3vs7Kekq0NxmZsmiMpGD/Esw== X-Received: by 2002:a62:12c9:: with SMTP id 70mr32152540pfs.156.1554752402547; Mon, 08 Apr 2019 12:40:02 -0700 (PDT) Received: from localhost ([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id 4sm49326074pgx.68.2019.04.08.12.40.01 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 08 Apr 2019 12:40:01 -0700 (PDT) From: Guenter Roeck To: Wim Van Sebroeck Cc: linux-watchdog@vger.kernel.org, linux-kernel@vger.kernel.org, Guenter Roeck Subject: [PATCH 18/22] watchdog: imgpdc_wdt: Convert to use device managed functions and other improvements Date: Mon, 8 Apr 2019 12:38:42 -0700 Message-Id: <1554752326-13319-19-git-send-email-linux@roeck-us.net> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1554752326-13319-1-git-send-email-linux@roeck-us.net> References: <1554752326-13319-1-git-send-email-linux@roeck-us.net> Sender: linux-watchdog-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Use device managed functions to simplify error handling, reduce source code size, improve readability, and reduce the likelyhood of bugs. Other improvements as listed below. The conversion was done automatically with coccinelle using the following semantic patches. The semantic patches and the scripts used to generate this commit log are available at https://github.com/groeck/coccinelle-patches - Drop assignments to otherwise unused variables - Drop empty remove function - Use devm_add_action_or_reset() for calls to clk_disable_unprepare - Introduce local variable 'struct device *dev' and use it instead of dereferencing it repeatedly - Use devm_watchdog_register_driver() to register watchdog device - Replace shutdown function with call to watchdog_stop_on_reboot() Signed-off-by: Guenter Roeck --- drivers/watchdog/imgpdc_wdt.c | 91 +++++++++++++++++-------------------------- 1 file changed, 36 insertions(+), 55 deletions(-) diff --git a/drivers/watchdog/imgpdc_wdt.c b/drivers/watchdog/imgpdc_wdt.c index 84c9fb905072..0fc31aadeee3 100644 --- a/drivers/watchdog/imgpdc_wdt.c +++ b/drivers/watchdog/imgpdc_wdt.c @@ -178,14 +178,20 @@ static const struct watchdog_ops pdc_wdt_ops = { .restart = pdc_wdt_restart, }; +static void pdc_clk_disable_unprepare(void *data) +{ + clk_disable_unprepare(data); +} + static int pdc_wdt_probe(struct platform_device *pdev) { + struct device *dev = &pdev->dev; u64 div; int ret, val; unsigned long clk_rate; struct pdc_wdt_dev *pdc_wdt; - pdc_wdt = devm_kzalloc(&pdev->dev, sizeof(*pdc_wdt), GFP_KERNEL); + pdc_wdt = devm_kzalloc(dev, sizeof(*pdc_wdt), GFP_KERNEL); if (!pdc_wdt) return -ENOMEM; @@ -193,42 +199,48 @@ static int pdc_wdt_probe(struct platform_device *pdev) if (IS_ERR(pdc_wdt->base)) return PTR_ERR(pdc_wdt->base); - pdc_wdt->sys_clk = devm_clk_get(&pdev->dev, "sys"); + pdc_wdt->sys_clk = devm_clk_get(dev, "sys"); if (IS_ERR(pdc_wdt->sys_clk)) { - dev_err(&pdev->dev, "failed to get the sys clock\n"); + dev_err(dev, "failed to get the sys clock\n"); return PTR_ERR(pdc_wdt->sys_clk); } - pdc_wdt->wdt_clk = devm_clk_get(&pdev->dev, "wdt"); + pdc_wdt->wdt_clk = devm_clk_get(dev, "wdt"); if (IS_ERR(pdc_wdt->wdt_clk)) { - dev_err(&pdev->dev, "failed to get the wdt clock\n"); + dev_err(dev, "failed to get the wdt clock\n"); return PTR_ERR(pdc_wdt->wdt_clk); } ret = clk_prepare_enable(pdc_wdt->sys_clk); if (ret) { - dev_err(&pdev->dev, "could not prepare or enable sys clock\n"); + dev_err(dev, "could not prepare or enable sys clock\n"); return ret; } + ret = devm_add_action_or_reset(dev, pdc_clk_disable_unprepare, + pdc_wdt->sys_clk); + if (ret) + return ret; ret = clk_prepare_enable(pdc_wdt->wdt_clk); if (ret) { - dev_err(&pdev->dev, "could not prepare or enable wdt clock\n"); - goto disable_sys_clk; + dev_err(dev, "could not prepare or enable wdt clock\n"); + return ret; } + ret = devm_add_action_or_reset(dev, pdc_clk_disable_unprepare, + pdc_wdt->wdt_clk); + if (ret) + return ret; /* We use the clock rate to calculate the max timeout */ clk_rate = clk_get_rate(pdc_wdt->wdt_clk); if (clk_rate == 0) { - dev_err(&pdev->dev, "failed to get clock rate\n"); - ret = -EINVAL; - goto disable_wdt_clk; + dev_err(dev, "failed to get clock rate\n"); + return -EINVAL; } if (order_base_2(clk_rate) > PDC_WDT_CONFIG_DELAY_MASK + 1) { - dev_err(&pdev->dev, "invalid clock rate\n"); - ret = -EINVAL; - goto disable_wdt_clk; + dev_err(dev, "invalid clock rate\n"); + return -EINVAL; } if (order_base_2(clk_rate) == 0) @@ -243,10 +255,10 @@ static int pdc_wdt_probe(struct platform_device *pdev) do_div(div, clk_rate); pdc_wdt->wdt_dev.max_timeout = div; pdc_wdt->wdt_dev.timeout = PDC_WDT_DEF_TIMEOUT; - pdc_wdt->wdt_dev.parent = &pdev->dev; + pdc_wdt->wdt_dev.parent = dev; watchdog_set_drvdata(&pdc_wdt->wdt_dev, pdc_wdt); - watchdog_init_timeout(&pdc_wdt->wdt_dev, heartbeat, &pdev->dev); + watchdog_init_timeout(&pdc_wdt->wdt_dev, heartbeat, dev); pdc_wdt_stop(&pdc_wdt->wdt_dev); @@ -257,24 +269,22 @@ static int pdc_wdt_probe(struct platform_device *pdev) case PDC_WDT_TICKLE_STATUS_TICKLE: case PDC_WDT_TICKLE_STATUS_TIMEOUT: pdc_wdt->wdt_dev.bootstatus |= WDIOF_CARDRESET; - dev_info(&pdev->dev, - "watchdog module last reset due to timeout\n"); + dev_info(dev, "watchdog module last reset due to timeout\n"); break; case PDC_WDT_TICKLE_STATUS_HRESET: - dev_info(&pdev->dev, + dev_info(dev, "watchdog module last reset due to hard reset\n"); break; case PDC_WDT_TICKLE_STATUS_SRESET: - dev_info(&pdev->dev, + dev_info(dev, "watchdog module last reset due to soft reset\n"); break; case PDC_WDT_TICKLE_STATUS_USER: - dev_info(&pdev->dev, + dev_info(dev, "watchdog module last reset due to user reset\n"); break; default: - dev_info(&pdev->dev, - "contains an illegal status code (%08x)\n", val); + dev_info(dev, "contains an illegal status code (%08x)\n", val); break; } @@ -283,36 +293,9 @@ static int pdc_wdt_probe(struct platform_device *pdev) platform_set_drvdata(pdev, pdc_wdt); - ret = watchdog_register_device(&pdc_wdt->wdt_dev); - if (ret) - goto disable_wdt_clk; - - return 0; - -disable_wdt_clk: - clk_disable_unprepare(pdc_wdt->wdt_clk); -disable_sys_clk: - clk_disable_unprepare(pdc_wdt->sys_clk); - return ret; -} - -static void pdc_wdt_shutdown(struct platform_device *pdev) -{ - struct pdc_wdt_dev *pdc_wdt = platform_get_drvdata(pdev); - - pdc_wdt_stop(&pdc_wdt->wdt_dev); -} - -static int pdc_wdt_remove(struct platform_device *pdev) -{ - struct pdc_wdt_dev *pdc_wdt = platform_get_drvdata(pdev); - - pdc_wdt_stop(&pdc_wdt->wdt_dev); - watchdog_unregister_device(&pdc_wdt->wdt_dev); - clk_disable_unprepare(pdc_wdt->wdt_clk); - clk_disable_unprepare(pdc_wdt->sys_clk); - - return 0; + watchdog_stop_on_reboot(&pdc_wdt->wdt_dev); + watchdog_stop_on_unregister(&pdc_wdt->wdt_dev); + return devm_watchdog_register_device(dev, &pdc_wdt->wdt_dev); } static const struct of_device_id pdc_wdt_match[] = { @@ -327,8 +310,6 @@ static struct platform_driver pdc_wdt_driver = { .of_match_table = pdc_wdt_match, }, .probe = pdc_wdt_probe, - .remove = pdc_wdt_remove, - .shutdown = pdc_wdt_shutdown, }; module_platform_driver(pdc_wdt_driver);