From patchwork Thu Dec 17 23:43:26 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Scally X-Patchwork-Id: 11981021 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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 F2749C35270 for ; Thu, 17 Dec 2020 23:44:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D732F23441 for ; Thu, 17 Dec 2020 23:44:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732278AbgLQXog (ORCPT ); Thu, 17 Dec 2020 18:44:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37316 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732201AbgLQXof (ORCPT ); Thu, 17 Dec 2020 18:44:35 -0500 Received: from mail-wm1-x32c.google.com (mail-wm1-x32c.google.com [IPv6:2a00:1450:4864:20::32c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A8C77C0617A7; Thu, 17 Dec 2020 15:43:54 -0800 (PST) Received: by mail-wm1-x32c.google.com with SMTP id 3so559247wmg.4; Thu, 17 Dec 2020 15:43:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=MGjgXza+FG01h/JQoRfmC2web91PoTk50kjVfFmC+Bk=; b=rrPRKNOXArB8EfEK9dLFvQBlLOialUzkQJzDKZTV7W2AhNCRFWtQCObbaPjbbB5nsC ln0NgkU9Y7P/tfB5lzhCk+pCcfnV87PMdCD26G8/VqFzVbKBLE/NqrmgnDWYF/PdLg4R d7szjyZw2dDGXQXDWt6fsmZUMo5youg442pZ7xrrldIRGMayHn5iCrPA5/hNpLKOGLm6 bMgi1gSnxxG7cu+HbB3qysA7FXl8mUovsvzN+f4wo82V8Zc/76vBKW1Lf0dA8NKbIVTm xblbMBqyX/6trN6Pradf4hZK17t8cpsq4mbJn6gI7o8xnbwHRjcXapOpgoPO2ofLdc6Y FLzg== 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=MGjgXza+FG01h/JQoRfmC2web91PoTk50kjVfFmC+Bk=; b=L3nCnBFJ037RO2Vb9Aubro1Na1r6Tk1X96peKTM+VU5XVZmQRunU1f3POpUFvn/BQM k9goucwAiObhKNp9zoiHzw0JFjrUOrlcySITHyRG9A8FNFXsABKArmrhz8MWXOehIUtx gFPk7Cxe9QBxhKptIxdLu7joPX9UFw/dmTQzjI/NqzpQGOhtfTtJSOkxdJGy2+FFq6Bh ypOA97KAeo0UXpnGG+A4o1er11CfvHC44S89/w+GAnVhZqs4TXXhMTihOTp9bFJY3fy/ QQ24w2neEJZktbcD+yxMxAjrRo/xAo0nfBVeONCDgSFY9/IKs82mXsrC37Ge0zm5rWyQ gSAg== X-Gm-Message-State: AOAM530i4Rog7228j6+y+jixUTglmAcnLppow+tBVkG/zYgg83qp0eMz VTPuQLn+mji6VWvgLsCOws37X8wFdyDG1GW6 X-Google-Smtp-Source: ABdhPJzwmyCMhBM+WTNgZczB1JPvQA344VXaJM58xVEVaqhr6tzOBXfPz9up3q+ofqYPcrGJRCxkOg== X-Received: by 2002:a1c:6a13:: with SMTP id f19mr1586073wmc.10.1608248633449; Thu, 17 Dec 2020 15:43:53 -0800 (PST) Received: from valhalla.home ([2.29.208.56]) by smtp.gmail.com with ESMTPSA id o3sm1873575wrc.93.2020.12.17.15.43.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Dec 2020 15:43:52 -0800 (PST) From: Daniel Scally To: linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, linux-media@vger.kernel.org, devel@acpica.org Cc: rjw@rjwysocki.net, lenb@kernel.org, gregkh@linuxfoundation.org, yong.zhi@intel.com, sakari.ailus@linux.intel.com, bingbu.cao@intel.com, tian.shu.qiu@intel.com, mchehab@kernel.org, robert.moore@intel.com, erik.kaneda@intel.com, pmladek@suse.com, rostedt@goodmis.org, sergey.senozhatsky@gmail.com, andriy.shevchenko@linux.intel.com, linux@rasmusvillemoes.dk, laurent.pinchart+renesas@ideasonboard.com, jacopo+renesas@jmondi.org, kieran.bingham+renesas@ideasonboard.com, linus.walleij@linaro.org, heikki.krogerus@linux.intel.com, kitakar@gmail.com, jorhand@linux.microsoft.com, Laurent Pinchart Subject: [PATCH v2 01/12] software_node: Fix refcounts in software_node_get_next_child() Date: Thu, 17 Dec 2020 23:43:26 +0000 Message-Id: <20201217234337.1983732-2-djrscally@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201217234337.1983732-1-djrscally@gmail.com> References: <20201217234337.1983732-1-djrscally@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org The software_node_get_next_child() function currently does not hold references to the child software_node that it finds or put the ref that is held against the old child - fix that. Fixes: 59abd83672f7 ("drivers: base: Introducing software nodes to the firmware node framework") Reviewed-by: Andy Shevchenko Reviewed-by: Laurent Pinchart Signed-off-by: Daniel Scally Reviewed-by: Sakari Ailus --- Changes in v2: - None drivers/base/swnode.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c index 010828fc785b..615a0c93e116 100644 --- a/drivers/base/swnode.c +++ b/drivers/base/swnode.c @@ -443,14 +443,18 @@ software_node_get_next_child(const struct fwnode_handle *fwnode, struct swnode *c = to_swnode(child); if (!p || list_empty(&p->children) || - (c && list_is_last(&c->entry, &p->children))) + (c && list_is_last(&c->entry, &p->children))) { + fwnode_handle_put(child); return NULL; + } if (c) c = list_next_entry(c, entry); else c = list_first_entry(&p->children, struct swnode, entry); - return &c->fwnode; + + fwnode_handle_put(child); + return fwnode_handle_get(&c->fwnode); } static struct fwnode_handle *