From patchwork Tue Oct 29 02:09:40 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: mtk25126 X-Patchwork-Id: 13854342 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5DA41D5B840 for ; Tue, 29 Oct 2024 02:12:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type: Content-Transfer-Encoding:MIME-Version:Message-ID:Date:Subject:CC:To:From: Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender :Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=9zxNMXwPCBjYW69Zb32ChS7Lih5KnlHYyLjDjWcKxkQ=; b=Dn/+6hJQrBmzoOiPmfcKIb7/Qv Ywc4ojY3ONZGsmnx7jQQblyJt6CPNAAWOXA6Aybz1Y/gz7JPKKrnrG6/PUQ0uaXnY62OpJNWTK4Ly QdwVjkMRI/QIUeMmOIZDj+2eC3OMk7JdoucTucwMSWdt9tbTg2tElTHny/u4kd0LZ2wIbMHjEjtmL +UXczobcGzkxyOYQJ+2ngGremE8eQ/QrTagD0bfT1eggaGaKdrvuLv78/+4X5ezSnwT00J2+oTx7y WDHNoLINo535O2RHfgc8tjLow7fKiJjL55wd3uRNc6RFKQBgdXd9qHlr92/NEUip40aq+ttll6InG rprHiO6A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1t5bic-0000000Cwj2-13cs; Tue, 29 Oct 2024 02:12:26 +0000 Received: from mailgw02.mediatek.com ([216.200.240.185]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1t5bgt-0000000CwCU-3dSM; Tue, 29 Oct 2024 02:10:41 +0000 X-UUID: f9439e9e959a11ef9048ed6ed365623b-20241028 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:Content-Transfer-Encoding:MIME-Version:Message-ID:Date:Subject:CC:To:From; bh=9zxNMXwPCBjYW69Zb32ChS7Lih5KnlHYyLjDjWcKxkQ=; b=QEaj7KydGUhLAKlkeeb1fbsfSA3lBfm6BfmCH/sp8PpzkR+FR3vR8Et9DqlIBq18YzI7vdiybWL1fMi6FtfaSHhxsR7kJu1fMZ44XC/YZXhPHhrmeXgGd/nYhYTucPlaqAWaL7g04ahVMne3Tj6iumjCX4L+GOhXqTJY9TOIgew=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.42,REQID:55f55fb6-9703-40cd-a3b6-d36e9342fc1a,IP:0,U RL:0,TC:0,Content:-20,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTIO N:release,TS:-20 X-CID-META: VersionHash:b0fcdc3,CLOUDID:29d95548-ca13-40ea-8070-fa012edab362,B ulkID:nil,BulkQuantity:0,Recheck:0,SF:102,TC:nil,Content:1,EDM:-3,IP:nil,U RL:11|1,File:nil,RT:nil,Bulk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OSA:0,AV:0,LES :1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0,ARC:0 X-CID-BVR: 0 X-CID-BAS: 0,_,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR,TF_CID_SPAM_ULN X-UUID: f9439e9e959a11ef9048ed6ed365623b-20241028 Received: from mtkmbs14n1.mediatek.inc [(172.21.101.75)] by mailgw02.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 433074756; Mon, 28 Oct 2024 19:10:31 -0700 Received: from mtkmbs11n2.mediatek.inc (172.21.101.187) by MTKMBS09N2.mediatek.inc (172.21.101.94) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Mon, 28 Oct 2024 19:10:28 -0700 Received: from mbjsdccf07.gcn.mediatek.inc (10.15.20.246) by mtkmbs11n2.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.26 via Frontend Transport; Tue, 29 Oct 2024 10:10:27 +0800 From: mtk25126 To: Alexandre Belloni , Matthias Brugger , AngeloGioacchino Del Regno CC: , , , , , , , , mtk25126 Subject: [PATCH] i3c: Remove redundant lock in i3c_device_uevent Date: Tue, 29 Oct 2024 10:09:40 +0800 Message-ID: <20241029020950.31053-1-defa.li@mediatek.com> X-Mailer: git-send-email 2.45.2 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241028_191039_978655_12EA3514 X-CRM114-Status: GOOD ( 10.25 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org We encountered the following lockdep warning. The i3c_master_register function recursively acquires &i3cbus->lock twice, which may cause a deadlock. Remove the logic of obtaining i3cbus->lock when using the i3c_device_uevent function to obtain the i3c_device_info structure. ============================================ WARNING: possible recursive locking detected 6.11.0-mainline -------------------------------------------- init/1 is trying to acquire lock: f1ffff80a6a40dc0 (&i3cbus->lock){++++}-{3:3}, at: i3c_bus_normaluse_lock but task is already holding lock: f1ffff80a6a40dc0 (&i3cbus->lock){++++}-{3:3}, at: i3c_master_register other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&i3cbus->lock); lock(&i3cbus->lock); *** DEADLOCK *** May be due to missing lock nesting notation 2 locks held by init/1: #0: fcffff809b6798f8 (&dev->mutex){....}-{3:3}, at: __driver_attach #1: f1ffff80a6a40dc0 (&i3cbus->lock){++++}-{3:3}, at: i3c_master_register stack backtrace: CPU: 6 UID: 0 PID: 1 Comm: init Call trace: dump_backtrace+0xfc/0x17c show_stack+0x18/0x28 dump_stack_lvl+0x40/0xc0 dump_stack+0x18/0x24 print_deadlock_bug+0x388/0x390 __lock_acquire+0x18bc/0x32ec lock_acquire+0x134/0x2b0 down_read+0x50/0x19c i3c_bus_normaluse_lock+0x14/0x24 i3c_device_get_info+0x24/0x58 i3c_device_uevent+0x34/0xa4 dev_uevent+0x310/0x384 kobject_uevent_env+0x244/0x414 kobject_uevent+0x14/0x20 device_add+0x278/0x460 device_register+0x20/0x34 i3c_master_register_new_i3c_devs+0x78/0x154 i3c_master_register+0x6a0/0x6d4 mtk_i3c_master_probe+0x3b8/0x4d8 platform_probe+0xa0/0xe0 really_probe+0x114/0x454 __driver_probe_device+0xa0/0x15c driver_probe_device+0x3c/0x1ac __driver_attach+0xc4/0x1f0 bus_for_each_dev+0x104/0x160 driver_attach+0x24/0x34 bus_add_driver+0x14c/0x294 driver_register+0x68/0x104 __platform_driver_register+0x20/0x30 init_module+0x20/0xfe4 do_one_initcall+0x184/0x464 do_init_module+0x58/0x1ec load_module+0xefc/0x10c8 __arm64_sys_finit_module+0x238/0x33c invoke_syscall+0x58/0x10c el0_svc_common+0xa8/0xdc do_el0_svc+0x1c/0x28 el0_svc+0x50/0xac el0t_64_sync_handler+0x70/0xbc el0t_64_sync+0x1a8/0x1ac Signed-off-by: mtk25126 --- drivers/i3c/master.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c index 6f3eb710a75d..bb8a8bf0c4c7 100644 --- a/drivers/i3c/master.c +++ b/drivers/i3c/master.c @@ -282,7 +282,8 @@ static int i3c_device_uevent(const struct device *dev, struct kobj_uevent_env *e struct i3c_device_info devinfo; u16 manuf, part, ext; - i3c_device_get_info(i3cdev, &devinfo); + if (i3cdev->desc) + devinfo = i3cdev->desc->info; manuf = I3C_PID_MANUF_ID(devinfo.pid); part = I3C_PID_PART_ID(devinfo.pid); ext = I3C_PID_EXTRA_INFO(devinfo.pid);