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[209.132.180.67]) by mx.google.com with ESMTP id o3si17730638pgi.388.2018.12.05.04.47.37; Wed, 05 Dec 2018 04:47:37 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=NahVgoXu; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727828AbeLEMrg (ORCPT + 31 others); Wed, 5 Dec 2018 07:47:36 -0500 Received: from mail-lj1-f195.google.com ([209.85.208.195]:39748 "EHLO mail-lj1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727182AbeLEMre (ORCPT ); Wed, 5 Dec 2018 07:47:34 -0500 Received: by mail-lj1-f195.google.com with SMTP id t9-v6so18186652ljh.6 for ; Wed, 05 Dec 2018 04:47:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=A4nDgU+7Qud5q5NA5TQ6/b4Bwy+ewSh5xeh7X5HZgf0=; b=NahVgoXu8syEOm7l2/ydfZxU8zJa+ZkG+qgq5mXGJdihaYumr+04Y/ptkVAzrCsGyA BIo4dWjegzgiMXJGC4i7zz7t5KmKRRU6T1sJRc4gGukbdy7+fRW/d6wBrM5PaIX5t3+F Erdne9uWUVQnh24nyFmPvumM0ezY2GmDCQ6HI= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=A4nDgU+7Qud5q5NA5TQ6/b4Bwy+ewSh5xeh7X5HZgf0=; b=lNKKA8j2oPdRNpPqQjJK9EKbC4AmYzN3jBKHLn1D4+Qdw+8wN5vA9IJWszgs39YZeD r3lx/I2KnNYwzhmkl8208VfGmIAoZ9kIMwVGa9SF2xGxRzyflucgxrnJcnwlKDIgIMgd 2/YpRYdzAvPPKdGfEBrbfM7IYKUCDIY9sRbPrYDOIahi9RfSd5s39jBCRzXZ+Zrj64U3 ijAsXkQ2i5XW8X26OgV0euG4ZLNx2vbjwA7YUOloovdd0DdrSgbg2mzQlP1VigZ/tMzc elfJmcqghZ1moGagHLXH/YNywwnwyQibBoEyhPaDYB8qKpACFBI7RUyZxRQ7ScKMMh4m GiTA== X-Gm-Message-State: AA+aEWZGM7zI2MCjKQWLMwp5VJYJ4SC0jZZxm4IYVMrSwdGMaaKnSINb 8+PwBgwTR/WuZy/IMEAMtiJlCg== X-Received: by 2002:a2e:5d12:: with SMTP id r18-v6mr17136640ljb.89.1544014051150; Wed, 05 Dec 2018 04:47:31 -0800 (PST) Received: from genomnajs.ideon.se ([85.235.10.227]) by smtp.gmail.com with ESMTPSA id e19-v6sm3797125ljf.67.2018.12.05.04.47.29 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 05 Dec 2018 04:47:29 -0800 (PST) From: Linus Walleij To: Liam Girdwood , Mark Brown Cc: linux-kernel@vger.kernel.org, Charles Keepax , Bartosz Golaszewski , Marek Szyprowski , Linus Walleij Subject: [PATCH 01/15 v3] regulator: core: Track dangling GPIO descriptors Date: Wed, 5 Dec 2018 13:47:07 +0100 Message-Id: <20181205124721.26624-2-linus.walleij@linaro.org> X-Mailer: git-send-email 2.19.2 In-Reply-To: <20181205124721.26624-1-linus.walleij@linaro.org> References: <20181205124721.26624-1-linus.walleij@linaro.org> MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If a GPIO descriptor is passed to the regulator_register() function inside the config->ena_gpiod callers must be sure that once they call this API the regulator core owns that descriptor and will make sure to issue gpiod_put() on it, no matter whether the call is successful or not. For device tree regulators, the regulator core will automatically set up regulator init data from the device tree when registering a regulator by calling regulator_of_get_init_data() which in turn calls down to the regulator driver's .of_parse_cb() callback. This callback (in drivers such as for max77686) may also choose to fill in the config->ena_gpiod field with a GPIO descriptor. Harden the errorpath of regulator_register() to properly gpiod_put() any passed in cfg->ena_gpiod or any gpiod coming from the device tree on any type of error. Signed-off-by: Linus Walleij --- ChangeLog v1->v3: - Resending. ChangeLog v1->v2: - New patch, just numbering v2 to keep it in line with the patch set it came out of. --- drivers/regulator/core.c | 55 ++++++++++++++++++++++++++++++++-------- 1 file changed, 45 insertions(+), 10 deletions(-) -- 2.19.2 diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 757619878068..79cb090ff22f 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -4868,21 +4868,33 @@ regulator_register(const struct regulator_desc *regulator_desc, struct regulator_config *config = NULL; static atomic_t regulator_no = ATOMIC_INIT(-1); struct regulator_dev *rdev; + bool dangling_cfg_gpiod = false; + bool dangling_of_gpiod = false; struct device *dev; int ret, i; - if (regulator_desc == NULL || cfg == NULL) + if (cfg == NULL) return ERR_PTR(-EINVAL); + if (cfg->ena_gpiod) + dangling_cfg_gpiod = true; + if (regulator_desc == NULL) { + ret = -EINVAL; + goto rinse; + } dev = cfg->dev; WARN_ON(!dev); - if (regulator_desc->name == NULL || regulator_desc->ops == NULL) - return ERR_PTR(-EINVAL); + if (regulator_desc->name == NULL || regulator_desc->ops == NULL) { + ret = -EINVAL; + goto rinse; + } if (regulator_desc->type != REGULATOR_VOLTAGE && - regulator_desc->type != REGULATOR_CURRENT) - return ERR_PTR(-EINVAL); + regulator_desc->type != REGULATOR_CURRENT) { + ret = -EINVAL; + goto rinse; + } /* Only one of each should be implemented */ WARN_ON(regulator_desc->ops->get_voltage && @@ -4893,16 +4905,20 @@ regulator_register(const struct regulator_desc *regulator_desc, /* If we're using selectors we must implement list_voltage. */ if (regulator_desc->ops->get_voltage_sel && !regulator_desc->ops->list_voltage) { - return ERR_PTR(-EINVAL); + ret = -EINVAL; + goto rinse; } if (regulator_desc->ops->set_voltage_sel && !regulator_desc->ops->list_voltage) { - return ERR_PTR(-EINVAL); + ret = -EINVAL; + goto rinse; } rdev = kzalloc(sizeof(struct regulator_dev), GFP_KERNEL); - if (rdev == NULL) - return ERR_PTR(-ENOMEM); + if (rdev == NULL) { + ret = -ENOMEM; + goto rinse; + } /* * Duplicate the config so the driver could override it after @@ -4911,11 +4927,22 @@ regulator_register(const struct regulator_desc *regulator_desc, config = kmemdup(cfg, sizeof(*cfg), GFP_KERNEL); if (config == NULL) { kfree(rdev); - return ERR_PTR(-ENOMEM); + ret = -ENOMEM; + goto rinse; } init_data = regulator_of_get_init_data(dev, regulator_desc, config, &rdev->dev.of_node); + /* + * We need to keep track of any GPIO descriptor coming from the + * device tree until we have handled it over to the core. If the + * config that was passed in to this function DOES NOT contain + * a descriptor, and the config after this call DOES contain + * a descriptor, we definately got one from parsing the device + * tree. + */ + if (!cfg->ena_gpiod && config->ena_gpiod) + dangling_of_gpiod = true; if (!init_data) { init_data = config->init_data; rdev->dev.of_node = of_node_get(config->of_node); @@ -4954,6 +4981,9 @@ regulator_register(const struct regulator_desc *regulator_desc, config->ena_gpio, ret); goto clean; } + /* The regulator core took over the GPIO descriptor */ + dangling_cfg_gpiod = false; + dangling_of_gpiod = false; } /* register with sysfs */ @@ -5039,8 +5069,13 @@ regulator_register(const struct regulator_desc *regulator_desc, regulator_ena_gpio_free(rdev); mutex_unlock(®ulator_list_mutex); clean: + if (dangling_of_gpiod) + gpiod_put(config->ena_gpiod); kfree(rdev); kfree(config); +rinse: + if (dangling_cfg_gpiod) + gpiod_put(cfg->ena_gpiod); return ERR_PTR(ret); } EXPORT_SYMBOL_GPL(regulator_register);