From mboxrd@z Thu Jan 1 00:00:00 1970 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=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 EE7B3C4727E for ; Thu, 24 Sep 2020 11:39:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B588C238A1 for ; Thu, 24 Sep 2020 11:39:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=bgdev-pl.20150623.gappssmtp.com header.i=@bgdev-pl.20150623.gappssmtp.com header.b="a7KuNLrw" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727195AbgIXLj0 (ORCPT ); Thu, 24 Sep 2020 07:39:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59630 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727484AbgIXLiv (ORCPT ); Thu, 24 Sep 2020 07:38:51 -0400 Received: from mail-wm1-x344.google.com (mail-wm1-x344.google.com [IPv6:2a00:1450:4864:20::344]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 004C3C0613D3 for ; Thu, 24 Sep 2020 04:38:50 -0700 (PDT) Received: by mail-wm1-x344.google.com with SMTP id e2so3255393wme.1 for ; Thu, 24 Sep 2020 04:38:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bgdev-pl.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=bCsr6AFFHdHhAugFVMGJohC8JN0hd4nL8k90M/6i7xA=; b=a7KuNLrwlM7cvptfMtEqtc5CpObOWJJFH9henQqs6idqfzL5qx7a9wLt2qGL4rT1Qz HutCQ1XrFdOs4pQA/nDIfdY6FMVAIEQsMDZlU5mc/CuxvUbDh/zIlSkAGsP6NFHhhnNd 4p6qhRDO0u8+AeeHYDV1nzUhpue9ar8pyt3JB0SRwKUyE3yfGvNtDXvkGzKkIQnMjJmI BXn0xVBLk0iwWyTAtoRm2eP+V4REcHuv7huXbBX3HW4qyd0PxDCNQAo6QX1K6rz6SS8y TFsyKVS7ba824hLFuu3AlRdnQMNyxc8FI06nsImBXaOtWSfuZWrgZvoGNTJFCAk3LEzO 8tRg== 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=bCsr6AFFHdHhAugFVMGJohC8JN0hd4nL8k90M/6i7xA=; b=rKFheshYvVrcge10V/pIYT4/zBYtt9L+djVRPl8MTP+e12O7ZJVl89hW323F3jjWfx HsfCbB8WtQgnEawVwoksIvdUW03DEaUX1y4YgthGl1fefeukrvPXpScnWjwdiFZkIdF+ YC0tnkZzAFw1N+RRZlWXYozWU2LDdZhcz6LQZhApFpqkqo1lfhiDUeL5u6JUXeAVQYCk 396RJ/K17w51JCOoZpnANjzdJ5zGtGD82WIXAqx43frMnUE27aVwimDN2+gt3o059l29 DCI3ZcrEpB6vr9nVKnUexYnKq/oIdiJYs6m/0vPulU9fTH8yXWgsxOxIDiNuoPuwV2/1 PGRg== X-Gm-Message-State: AOAM532Y8SLDjBHddyy2iUbUYQnpZLWeKEiiHHjTVKcfFvEXhhb/myJr vIoMVBv022O5aL8okSGl1wGFyA== X-Google-Smtp-Source: ABdhPJyE32p6WO+xWXo7rVqwDl6I0AjipMB9OZdrBkbmGOJUcH79pPsUmdL65eiq3Ag6J9S6fIqm7g== X-Received: by 2002:a1c:b608:: with SMTP id g8mr4552385wmf.106.1600947529507; Thu, 24 Sep 2020 04:38:49 -0700 (PDT) Received: from debian-brgl.home (lfbn-nic-1-68-20.w2-15.abo.wanadoo.fr. [2.15.159.20]) by smtp.gmail.com with ESMTPSA id y207sm3390133wmc.17.2020.09.24.04.38.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Sep 2020 04:38:48 -0700 (PDT) From: Bartosz Golaszewski To: Linus Walleij , Jonathan Corbet , Andy Shevchenko , Kent Gibson Cc: linux-gpio@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH 1/9] lib: string_helpers: provide kfree_strarray() Date: Thu, 24 Sep 2020 13:38:34 +0200 Message-Id: <20200924113842.11670-2-brgl@bgdev.pl> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200924113842.11670-1-brgl@bgdev.pl> References: <20200924113842.11670-1-brgl@bgdev.pl> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org From: Bartosz Golaszewski There's a common pattern of dynamically allocating an array of char pointers and then also dynamically allocating each string in this array. Provide a helper for freeing such a string array with one call. Signed-off-by: Bartosz Golaszewski --- include/linux/string_helpers.h | 2 ++ lib/string_helpers.c | 22 ++++++++++++++++++++++ 2 files changed, 24 insertions(+) diff --git a/include/linux/string_helpers.h b/include/linux/string_helpers.h index 86f150c2a6b6..55b25120a1c6 100644 --- a/include/linux/string_helpers.h +++ b/include/linux/string_helpers.h @@ -94,4 +94,6 @@ char *kstrdup_quotable(const char *src, gfp_t gfp); char *kstrdup_quotable_cmdline(struct task_struct *task, gfp_t gfp); char *kstrdup_quotable_file(struct file *file, gfp_t gfp); +void kfree_strarray(char **str_array, size_t num_str); + #endif diff --git a/lib/string_helpers.c b/lib/string_helpers.c index 963050c0283e..56c01ec8a076 100644 --- a/lib/string_helpers.c +++ b/lib/string_helpers.c @@ -649,3 +649,25 @@ char *kstrdup_quotable_file(struct file *file, gfp_t gfp) return pathname; } EXPORT_SYMBOL_GPL(kstrdup_quotable_file); + +/** + * kfree_strarray - free a number of dynamically allocated strings contained + * in an array and the array itself + * + * @str_array: Dynamically allocated array of strings to free. If NULL - the + * function does nothing. + * @num_str: Number of strings (starting from the beginning of the array) to + * free. + * + * Passing a non-null str_array and num_str == 0 as well as NULL str_array and + * num_str == 0 are valid use-cases. + */ +void kfree_strarray(char **str_array, size_t num_str) +{ + unsigned int i; + + for (i = 0; i < num_str; i++) + kfree(str_array[i]); + kfree(str_array); +} +EXPORT_SYMBOL_GPL(kfree_strarray); -- 2.26.1