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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, 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,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 2CB7EC433E8 for ; Mon, 22 Mar 2021 12:36:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 01121619B9 for ; Mon, 22 Mar 2021 12:36:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231811AbhCVMf6 (ORCPT ); Mon, 22 Mar 2021 08:35:58 -0400 Received: from mail.kernel.org ([198.145.29.99]:55678 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230290AbhCVMdA (ORCPT ); Mon, 22 Mar 2021 08:33:00 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 8C3ED619A8; Mon, 22 Mar 2021 12:32:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1616416380; bh=VdBJmZUaLe0VaDm377AThMdHYlmhbxsnqxyu+AZpJhs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=poqPUtHnARdFHxLPRCFj7zavvXBm3ZuNVla2OopYCJBZXv9tLZ6RLJlgg3YtAq6Jk 8XHDu/AUPad87DJBszg3dg6TKHOJ2YPKUZJRlRfDG1MUfnCIUEXqi0UdBP85l/N42i QWzXRlNPt8ewCrBwkct8Ju9QDY5+9tzLmXUzqWIU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Chiranjeevi Rapolu , Mika Westerberg Subject: [PATCH 5.11 085/120] thunderbolt: Initialize HopID IDAs in tb_switch_alloc() Date: Mon, 22 Mar 2021 13:27:48 +0100 Message-Id: <20210322121932.517724419@linuxfoundation.org> X-Mailer: git-send-email 2.31.0 In-Reply-To: <20210322121929.669628946@linuxfoundation.org> References: <20210322121929.669628946@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mika Westerberg commit 781e14eaa7d168dc07d2a2eea5c55831a5bb46f3 upstream. If there is a failure before the tb_switch_add() is called the switch object is released by tb_switch_release() but at that point HopID IDAs have not yet been initialized. So we see splat like this: BUG: spinlock bad magic on CPU#2, kworker/u8:5/115 ... Workqueue: thunderbolt0 tb_handle_hotplug Call Trace: dump_stack+0x97/0xdc ? spin_bug+0x9a/0xa7 do_raw_spin_lock+0x68/0x98 _raw_spin_lock_irqsave+0x3f/0x5d ida_destroy+0x4f/0x127 tb_switch_release+0x6d/0xfd device_release+0x2c/0x7d kobject_put+0x9b/0xbc tb_handle_hotplug+0x278/0x452 process_one_work+0x1db/0x396 worker_thread+0x216/0x375 kthread+0x14d/0x155 ? pr_cont_work+0x58/0x58 ? kthread_blkcg+0x2e/0x2e ret_from_fork+0x1f/0x40 Fix this by always initializing HopID IDAs in tb_switch_alloc(). Fixes: 0b2863ac3cfd ("thunderbolt: Add functions for allocating and releasing HopIDs") Cc: stable@vger.kernel.org Reported-by: Chiranjeevi Rapolu Signed-off-by: Mika Westerberg Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/switch.c | 18 ++++++++---------- 1 file changed, 8 insertions(+), 10 deletions(-) --- a/drivers/thunderbolt/switch.c +++ b/drivers/thunderbolt/switch.c @@ -762,12 +762,6 @@ static int tb_init_port(struct tb_port * tb_dump_port(port->sw->tb, &port->config); - /* Control port does not need HopID allocation */ - if (port->port) { - ida_init(&port->in_hopids); - ida_init(&port->out_hopids); - } - INIT_LIST_HEAD(&port->list); return 0; @@ -1789,10 +1783,8 @@ static void tb_switch_release(struct dev dma_port_free(sw->dma_port); tb_switch_for_each_port(sw, port) { - if (!port->disabled) { - ida_destroy(&port->in_hopids); - ida_destroy(&port->out_hopids); - } + ida_destroy(&port->in_hopids); + ida_destroy(&port->out_hopids); } kfree(sw->uuid); @@ -1972,6 +1964,12 @@ struct tb_switch *tb_switch_alloc(struct /* minimum setup for tb_find_cap and tb_drom_read to work */ sw->ports[i].sw = sw; sw->ports[i].port = i; + + /* Control port does not need HopID allocation */ + if (i) { + ida_init(&sw->ports[i].in_hopids); + ida_init(&sw->ports[i].out_hopids); + } } ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS);