From patchwork Sat Apr 9 04:12:43 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Takashi Sakamoto X-Patchwork-Id: 559481 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 78598C433FE for ; Sat, 9 Apr 2022 04:13:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230083AbiDIEPF (ORCPT ); Sat, 9 Apr 2022 00:15:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42086 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238260AbiDIEPD (ORCPT ); Sat, 9 Apr 2022 00:15:03 -0400 Received: from wout1-smtp.messagingengine.com (wout1-smtp.messagingengine.com [64.147.123.24]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6348ED399D; Fri, 8 Apr 2022 21:12:57 -0700 (PDT) Received: from compute4.internal (compute4.nyi.internal [10.202.2.44]) by mailout.west.internal (Postfix) with ESMTP id 953413201FED; Sat, 9 Apr 2022 00:12:56 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute4.internal (MEProxy); Sat, 09 Apr 2022 00:12:57 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sakamocchi.jp; h=cc:cc:content-transfer-encoding:date:date:from:from :in-reply-to:in-reply-to:message-id:mime-version:references :reply-to:sender:subject:subject:to:to; s=fm1; bh=4IOIHeCPahu18m XrSxL18izkRq7PcU2ik7+XDSoutzQ=; b=APB0YY7IuFNdX0tRyjaWJ2ji1+8e4H oe+DmPaIVCp68N7ERJT2afcFSYTrYuGDOV5/CLdJW4R/M2yqPF2jqYvURSR4XweN C4baOJooMG7wKxbmSfOnndIV6q/xlkBey2lGxAoxLFu43NgXGfo4F5k05w+FtjxP iG/hHr6mUYLFpTkEzpTHpV9r6GBdL1mrAPpwVE2W4CfjQzxQAHXclOTTne1JkTTJ aCAj71nK1sD4KUdQYmGXKSZxfNY8tsCMSku5k1wR3Y+J3lC8yWMuqfXLCtoHoqfK fmV6Xl0n8QqZ1WHPQbiZg8lUF2bK9Px2FBNWC+m+seeWxzK6S52dy2IA== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-transfer-encoding:date:date :from:from:in-reply-to:in-reply-to:message-id:mime-version :references:reply-to:sender:subject:subject:to:to:x-me-proxy :x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s=fm3; bh=4IOIHe CPahu18mXrSxL18izkRq7PcU2ik7+XDSoutzQ=; b=TJHeDKptwJcAYqlnKQEKGq 3x48SXXw6MuBE0M7wBwqsuLR8hYZWWKiLx+R527mKqAUcSv+Cqa6dVbiO7Sq2mij HJ0eFsj917POjnfiC9tiUqgUL1RftvVsRB0RJ5oV9VSqdL/CvSMgj/B2VewH2aUd 9pwpM8yw4xZXr4x+YT9yTUr7lQ5BetcFSVYDHW/fto8KmtzAQmLSkJUXHcOgmbDf b3VTXH3I3YgoEpJAtyzXppyN581DkyDSrRe3F4Wre0Sk+YytRS0iQn2JpgOAKfU9 JQPVBlsR8QCKThfUztaqD2Z3yfcRs3ojjWhE+BgpZbGnHBak6dymYUSjJXNcTL2Q == X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvvddrudekuddgjeekucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmne cujfgurhephffvufffkffojghfggfgsedtkeertdertddtnecuhfhrohhmpefvrghkrghs hhhiucfurghkrghmohhtohcuoehoqdhtrghkrghshhhisehsrghkrghmohgttghhihdrjh hpqeenucggtffrrghtthgvrhhnpeevfefffeektefgveegfeelheffhfeujedtjeevtefh keevkedtjeejvddtjefhjeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepmh grihhlfhhrohhmpehoqdhtrghkrghshhhisehsrghkrghmohgttghhihdrjhhp X-ME-Proxy: Received: by mail.messagingengine.com (Postfix) with ESMTPA; Sat, 9 Apr 2022 00:12:54 -0400 (EDT) From: Takashi Sakamoto To: tiwai@suse.de Cc: linux1394-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, alsa-devel@alsa-project.org, Niels Dossche , stable@vger.kernel.org Subject: [PATCH 3/3] firewire: core: extend card->lock in fw_core_handle_bus_reset Date: Sat, 9 Apr 2022 13:12:43 +0900 Message-Id: <20220409041243.603210-4-o-takashi@sakamocchi.jp> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220409041243.603210-1-o-takashi@sakamocchi.jp> References: <20220409041243.603210-1-o-takashi@sakamocchi.jp> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Niels Dossche card->local_node and card->bm_retries are both always accessed under card->lock. fw_core_handle_bus_reset has a check whose condition depends on card->local_node and whose body writes to card->bm_retries. Both of these accesses are not under card->lock. Move the lock acquiring of card->lock to before this check such that these accesses do happen when card->lock is held. fw_destroy_nodes is called inside the check. Since fw_destroy_nodes already acquires card->lock inside its function body, move this out to the callsites of fw_destroy_nodes. Also add a comment to indicate which locking is necessary when calling fw_destroy_nodes. Cc: Signed-off-by: Niels Dossche Signed-off-by: Takashi Sakamoto --- drivers/firewire/core-card.c | 3 +++ drivers/firewire/core-topology.c | 9 +++------ 2 files changed, 6 insertions(+), 6 deletions(-) diff --git a/drivers/firewire/core-card.c b/drivers/firewire/core-card.c index 54be88167c60..f3b3953cac83 100644 --- a/drivers/firewire/core-card.c +++ b/drivers/firewire/core-card.c @@ -668,6 +668,7 @@ EXPORT_SYMBOL_GPL(fw_card_release); void fw_core_remove_card(struct fw_card *card) { struct fw_card_driver dummy_driver = dummy_driver_template; + unsigned long flags; card->driver->update_phy_reg(card, 4, PHY_LINK_ACTIVE | PHY_CONTENDER, 0); @@ -682,7 +683,9 @@ void fw_core_remove_card(struct fw_card *card) dummy_driver.stop_iso = card->driver->stop_iso; card->driver = &dummy_driver; + spin_lock_irqsave(&card->lock, flags); fw_destroy_nodes(card); + spin_unlock_irqrestore(&card->lock, flags); /* Wait for all users, especially device workqueue jobs, to finish. */ fw_card_put(card); diff --git a/drivers/firewire/core-topology.c b/drivers/firewire/core-topology.c index b63d55f5ebd3..f40c81534381 100644 --- a/drivers/firewire/core-topology.c +++ b/drivers/firewire/core-topology.c @@ -375,16 +375,13 @@ static void report_found_node(struct fw_card *card, card->bm_retries = 0; } +/* Must be called with card->lock held */ void fw_destroy_nodes(struct fw_card *card) { - unsigned long flags; - - spin_lock_irqsave(&card->lock, flags); card->color++; if (card->local_node != NULL) for_each_fw_node(card, card->local_node, report_lost_node); card->local_node = NULL; - spin_unlock_irqrestore(&card->lock, flags); } static void move_tree(struct fw_node *node0, struct fw_node *node1, int port) @@ -510,6 +507,8 @@ void fw_core_handle_bus_reset(struct fw_card *card, int node_id, int generation, struct fw_node *local_node; unsigned long flags; + spin_lock_irqsave(&card->lock, flags); + /* * If the selfID buffer is not the immediate successor of the * previously processed one, we cannot reliably compare the @@ -521,8 +520,6 @@ void fw_core_handle_bus_reset(struct fw_card *card, int node_id, int generation, card->bm_retries = 0; } - spin_lock_irqsave(&card->lock, flags); - card->broadcast_channel_allocated = card->broadcast_channel_auto_allocated; card->node_id = node_id; /*