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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 78C11C64E7B for ; Mon, 30 Nov 2020 16:11:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0D432206D5 for ; Mon, 30 Nov 2020 16:11:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="FrLzipGK" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728638AbgK3QL3 (ORCPT ); Mon, 30 Nov 2020 11:11:29 -0500 Received: from perceval.ideasonboard.com ([213.167.242.64]:59856 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727205AbgK3QL2 (ORCPT ); Mon, 30 Nov 2020 11:11:28 -0500 Received: from pendragon.ideasonboard.com (62-78-145-57.bb.dnainternet.fi [62.78.145.57]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id D6C0CB26; Mon, 30 Nov 2020 17:10:45 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1606752646; bh=YK8bIo43bVkfzz3B1bpargfqeptKw5FDEfrqzzJmCbY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=FrLzipGK6vwnwX+P0ZfknMsGumKtcukKrbGoygj7WmF5kotOnOdlDgh7mNupc+p18 xN/+ssNz4GL2GY0LoQMSVBiUgeKE5tcD22HS4YfTi76glxC3WF3eQ6DNZDrlhxZ8Bd 6F/uuCbZtnIP3nDUeu7+vjXgqfwGItz7MhldDPnA= Date: Mon, 30 Nov 2020 18:10:37 +0200 From: Laurent Pinchart To: Daniel Scally Cc: linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, linux-gpio@vger.kernel.org, linux-i2c@vger.kernel.org, linux-media@vger.kernel.org, devel@acpica.org, rjw@rjwysocki.net, lenb@kernel.org, gregkh@linuxfoundation.org, mika.westerberg@linux.intel.com, andriy.shevchenko@linux.intel.com, linus.walleij@linaro.org, bgolaszewski@baylibre.com, wsa@kernel.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, linux@rasmusvillemoes.dk, kieran.bingham+renesas@ideasonboard.com, jacopo+renesas@jmondi.org, laurent.pinchart+renesas@ideasonboard.com, jorhand@linux.microsoft.com, kitakar@gmail.com, heikki.krogerus@linux.intel.com Subject: Re: [PATCH 03/18] software_node: Fix failure to put() and get() references to children in software_node_get_next_child() Message-ID: <20201130161037.GF14465@pendragon.ideasonboard.com> References: <20201130133129.1024662-1-djrscally@gmail.com> <20201130133129.1024662-4-djrscally@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20201130133129.1024662-4-djrscally@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Daniel, Thank you for the patch. On Mon, Nov 30, 2020 at 01:31:14PM +0000, Daniel Scally wrote: > 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. > > Signed-off-by: Daniel Scally Reviewed-by: Laurent Pinchart > --- > Changes since RFC v3: > > Put reference to previous child. > > 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 * -- Regards, Laurent Pinchart