From patchwork Mon Apr 17 14:05:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wang Zhang X-Patchwork-Id: 674872 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 4F459C77B7A for ; Mon, 17 Apr 2023 14:17:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229581AbjDQOQ6 (ORCPT ); Mon, 17 Apr 2023 10:16:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42810 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229971AbjDQOQz (ORCPT ); Mon, 17 Apr 2023 10:16:55 -0400 Received: from hust.edu.cn (mail.hust.edu.cn [202.114.0.240]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 878CE59E6; Mon, 17 Apr 2023 07:16:33 -0700 (PDT) Received: from van1shing-pc.localdomain ([10.12.182.0]) (user=silver_code@hust.edu.cn mech=LOGIN bits=0) by mx1.hust.edu.cn with ESMTP id 33HE5WJQ031085-33HE5WJR031085 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Mon, 17 Apr 2023 22:05:34 +0800 From: Wang Zhang To: Peter Korsgaard , Andrew Lunn Cc: hust-os-kernel-patches@googlegroups.com, Wang Zhang , linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2] i2c: ocores: use devm_ managed clks Date: Mon, 17 Apr 2023 22:05:31 +0800 Message-Id: <20230417140531.81853-1-silver_code@hust.edu.cn> X-Mailer: git-send-email 2.34.1 In-Reply-To: <843fab4d-0fdd-4610-91ed-1d8e9accbd25@lunn.ch> References: <843fab4d-0fdd-4610-91ed-1d8e9accbd25@lunn.ch> MIME-Version: 1.0 X-FEAS-AUTH-USER: silver_code@hust.edu.cn Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org Smatch Warns: drivers/i2c/busses/i2c-ocores.c:701 ocores_i2c_probe() warn: missing unwind goto? If any wrong occurs in ocores_i2c_of_probe, the i2c->clk needs to be released. But the function returns directly in line 701 without freeing the clock. Even though we can fix it by freeing the clock manually if platform_get_irq_optional fails, it may not be following the best practice. The original code for this driver contains if (IS_ERR()) checks throughout, explicitly allowing the driver to continue loading even if devm_clk_get() fails. While it is not entirely clear why the original author implemented this behavior, there may have been certain circumstances or issues that were not apparent to us. It's possible that they were trying to work around a bug by employing an unconventional solution.Using `devm_clk_get_enabled()` rather than devm_clk_get() can automatically track the usage of clocks and free them when they are no longer needed or an error occurs. fixing it by changing `ocores_i2c_of_probe` to use `devm_clk_get_enabled()` rather than `devm_clk_get()`, changing `goto err_clk' to direct return and removing `err_clk`. Signed-off-by: Wang Zhang Reviewed-by: Andrew Lunn --- v1->v2: change `ocores_i2c_of_probe` to use `devm_clk_get_enabled()` drivers/i2c/busses/i2c-ocores.c | 62 +++++++++++++-------------------- 1 file changed, 24 insertions(+), 38 deletions(-) diff --git a/drivers/i2c/busses/i2c-ocores.c b/drivers/i2c/busses/i2c-ocores.c index a0af027db04c..1dcb1af1ad13 100644 --- a/drivers/i2c/busses/i2c-ocores.c +++ b/drivers/i2c/busses/i2c-ocores.c @@ -549,28 +549,24 @@ static int ocores_i2c_of_probe(struct platform_device *pdev, &clock_frequency); i2c->bus_clock_khz = 100; - i2c->clk = devm_clk_get(&pdev->dev, NULL); + i2c->clk = devm_clk_get_enabled(&pdev->dev, NULL); - if (!IS_ERR(i2c->clk)) { - int ret = clk_prepare_enable(i2c->clk); - - if (ret) { - dev_err(&pdev->dev, - "clk_prepare_enable failed: %d\n", ret); - return ret; - } - i2c->ip_clock_khz = clk_get_rate(i2c->clk) / 1000; - if (clock_frequency_present) - i2c->bus_clock_khz = clock_frequency / 1000; + if (IS_ERR(i2c->clk)) { + dev_err(&pdev->dev, + "devm_clk_get_enabled failed\n"); + return PTR_ERR(i2c->clk); } + i2c->ip_clock_khz = clk_get_rate(i2c->clk) / 1000; + if (clock_frequency_present) + i2c->bus_clock_khz = clock_frequency / 1000; + if (i2c->ip_clock_khz == 0) { if (of_property_read_u32(np, "opencores,ip-clock-frequency", &val)) { if (!clock_frequency_present) { dev_err(&pdev->dev, "Missing required parameter 'opencores,ip-clock-frequency'\n"); - clk_disable_unprepare(i2c->clk); return -ENODEV; } i2c->ip_clock_khz = clock_frequency / 1000; @@ -675,8 +671,7 @@ static int ocores_i2c_probe(struct platform_device *pdev) default: dev_err(&pdev->dev, "Unsupported I/O width (%d)\n", i2c->reg_io_width); - ret = -EINVAL; - goto err_clk; + return -EINVAL; } } @@ -707,13 +702,13 @@ static int ocores_i2c_probe(struct platform_device *pdev) pdev->name, i2c); if (ret) { dev_err(&pdev->dev, "Cannot claim IRQ\n"); - goto err_clk; + return ret; } } ret = ocores_init(&pdev->dev, i2c); if (ret) - goto err_clk; + return ret; /* hook up driver to tree */ platform_set_drvdata(pdev, i2c); @@ -725,7 +720,7 @@ static int ocores_i2c_probe(struct platform_device *pdev) /* add i2c adapter to i2c tree */ ret = i2c_add_adapter(&i2c->adap); if (ret) - goto err_clk; + return ret; /* add in known devices to the bus */ if (pdata) { @@ -734,10 +729,6 @@ static int ocores_i2c_probe(struct platform_device *pdev) } return 0; - -err_clk: - clk_disable_unprepare(i2c->clk); - return ret; } static int ocores_i2c_remove(struct platform_device *pdev) @@ -752,9 +743,6 @@ static int ocores_i2c_remove(struct platform_device *pdev) /* remove adapter & data */ i2c_del_adapter(&i2c->adap); - if (!IS_ERR(i2c->clk)) - clk_disable_unprepare(i2c->clk); - return 0; } @@ -768,8 +756,7 @@ static int ocores_i2c_suspend(struct device *dev) ctrl &= ~(OCI2C_CTRL_EN | OCI2C_CTRL_IEN); oc_setreg(i2c, OCI2C_CONTROL, ctrl); - if (!IS_ERR(i2c->clk)) - clk_disable_unprepare(i2c->clk); + clk_disable_unprepare(i2c->clk); return 0; } @@ -777,19 +764,18 @@ static int ocores_i2c_resume(struct device *dev) { struct ocores_i2c *i2c = dev_get_drvdata(dev); - if (!IS_ERR(i2c->clk)) { - unsigned long rate; - int ret = clk_prepare_enable(i2c->clk); + unsigned long rate; + int ret = clk_prepare_enable(i2c->clk); - if (ret) { - dev_err(dev, - "clk_prepare_enable failed: %d\n", ret); - return ret; - } - rate = clk_get_rate(i2c->clk) / 1000; - if (rate) - i2c->ip_clock_khz = rate; + if (ret) { + dev_err(dev, + "clk_prepare_enable failed: %d\n", ret); + return ret; } + rate = clk_get_rate(i2c->clk) / 1000; + if (rate) + i2c->ip_clock_khz = rate; + return ocores_init(dev, i2c); }