From patchwork Mon Apr 24 08:03:56 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alice Chao X-Patchwork-Id: 13221828 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 3404FC77B61 for ; Mon, 24 Apr 2023 08:04:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231240AbjDXIET (ORCPT ); Mon, 24 Apr 2023 04:04:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44446 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230504AbjDXIES (ORCPT ); Mon, 24 Apr 2023 04:04:18 -0400 Received: from mailgw02.mediatek.com (unknown [210.61.82.184]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BA28499; Mon, 24 Apr 2023 01:04:09 -0700 (PDT) X-UUID: 93eb9ff2e27611edb6b9f13eb10bd0fe-20230424 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:MIME-Version:Message-ID:Date:Subject:CC:To:From; bh=nArHEf93lLs4kl0maPyf7eFjEu8BzOOYTL22bRX4/1U=; b=Cskj5IUPOnoNhwJSFFqZNQk/WohTdVOEzIw3L2SgeMvAyG101XkDsaf/Sd257wbXcRjEbfzSfg6pTqVUUbDPuZYTc9rGaXWDayYHP2xNyHw3tOrPzrWy4x4cZnkMClpbhNBRZ7f/ywxmNCN2mu7wd0KIYjEle0uxbrIsNBm/738=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.22,REQID:e42e0e36-b421-47c2-aac5-38fa4a4d0cad,IP:0,U RL:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION: release,TS:0 X-CID-META: VersionHash:120426c,CLOUDID:0a0ef0eb-db6f-41fe-8b83-13fe7ed1ef52,B ulkID:nil,BulkQuantity:0,Recheck:0,SF:102,TC:nil,Content:0,EDM:-3,IP:nil,U RL:1,File:nil,Bulk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OSA:0,AV:0 X-CID-BVR: 0,NGT X-CID-BAS: 0,NGT,0,_ X-UUID: 93eb9ff2e27611edb6b9f13eb10bd0fe-20230424 Received: from mtkmbs11n2.mediatek.inc [(172.21.101.187)] by mailgw02.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 1397087668; Mon, 24 Apr 2023 16:04:03 +0800 Received: from mtkmbs11n2.mediatek.inc (172.21.101.187) by mtkmbs10n2.mediatek.inc (172.21.101.183) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Mon, 24 Apr 2023 16:04:02 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkmbs11n2.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.26 via Frontend Transport; Mon, 24 Apr 2023 16:04:02 +0800 From: Alice Chao To: Alim Akhtar , Avri Altman , Bart Van Assche , "James E.J. Bottomley" , "Martin K. Petersen" , Matthias Brugger , AngeloGioacchino Del Regno , Can Guo , Asutosh Das , Stanley Chu , Manivannan Sadhasivam CC: , , , , , , , , , , , , , , Subject: [PATCH v3 1/1] scsi: ufs: core: Fix &hwq->cq_lock deadlock issue Date: Mon, 24 Apr 2023 16:03:56 +0800 Message-ID: <20230424080400.8955-1-alice.chao@mediatek.com> X-Mailer: git-send-email 2.18.0 MIME-Version: 1.0 X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org [name:lockdep&]WARNING: inconsistent lock state [name:lockdep&]-------------------------------- [name:lockdep&]inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage. [name:lockdep&]kworker/u16:4/260 [HC0[0]:SC0[0]:HE1:SE1] takes: ffffff8028444600 (&hwq->cq_lock){?.-.}-{2:2}, at: ufshcd_mcq_poll_cqe_lock+0x30/0xe0 [name:lockdep&]{IN-HARDIRQ-W} state was registered at: lock_acquire+0x17c/0x33c _raw_spin_lock+0x5c/0x7c ufshcd_mcq_poll_cqe_lock+0x30/0xe0 ufs_mtk_mcq_intr+0x60/0x1bc [ufs_mediatek_mod] __handle_irq_event_percpu+0x140/0x3ec handle_irq_event+0x50/0xd8 handle_fasteoi_irq+0x148/0x2b0 generic_handle_domain_irq+0x4c/0x6c gic_handle_irq+0x58/0x134 call_on_irq_stack+0x40/0x74 do_interrupt_handler+0x84/0xe4 el1_interrupt+0x3c/0x78 Possible unsafe locking scenario: CPU0 ---- lock(&hwq->cq_lock); lock(&hwq->cq_lock); *** DEADLOCK *** 2 locks held by kworker/u16:4/260: [name:lockdep&] stack backtrace: CPU: 7 PID: 260 Comm: kworker/u16:4 Tainted: G S W OE 6.1.17-mainline-android14-2-g277223301adb #1 Workqueue: ufs_eh_wq_0 ufshcd_err_handler Call trace: dump_backtrace+0x10c/0x160 show_stack+0x20/0x30 dump_stack_lvl+0x98/0xd8 dump_stack+0x20/0x60 print_usage_bug+0x584/0x76c mark_lock_irq+0x488/0x510 mark_lock+0x1ec/0x25c __lock_acquire+0x4d8/0xffc lock_acquire+0x17c/0x33c _raw_spin_lock+0x5c/0x7c ufshcd_mcq_poll_cqe_lock+0x30/0xe0 ufshcd_poll+0x68/0x1b0 ufshcd_transfer_req_compl+0x9c/0xc8 ufshcd_err_handler+0x3bc/0xea0 process_one_work+0x2f4/0x7e8 worker_thread+0x234/0x450 kthread+0x110/0x134 ret_from_fork+0x10/0x20 ufs_mtk_mcq_intr() could refer to https://lore.kernel.org/all/20230328103423.10970-3-powen.kao@mediatek.com/ When ufshcd_err_handler() is executed, CQ event interrupt can enter waiting for the same lock. It could happened in upstream code path ufshcd_handle_mcq_cq_events() and also in ufs_mtk_mcq_intr(). This warning message will be generated when &hwq->cq_lock is used in IRQ context with IRQ enabled. Use ufshcd_mcq_poll_cqe_lock() with spin_lock_irqsave instead of spin_lock to resolve the deadlock issue. Fixes: ed975065c31c ("scsi: ufs: core: mcq: Add completion support in poll") Reviewed-by: Can Guo Reviewed-by: Stanley Chu Signed-off-by: Alice Chao Reviewed-by: AngeloGioacchino Del Regno Reviewed-by: Bart Van Assche --- Change since v2 -Add commit: Add Reviewed-by: tag --- drivers/ufs/core/ufs-mcq.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/ufs/core/ufs-mcq.c b/drivers/ufs/core/ufs-mcq.c index 31df052fbc41..202ff71e1b58 100644 --- a/drivers/ufs/core/ufs-mcq.c +++ b/drivers/ufs/core/ufs-mcq.c @@ -299,11 +299,11 @@ EXPORT_SYMBOL_GPL(ufshcd_mcq_poll_cqe_nolock); unsigned long ufshcd_mcq_poll_cqe_lock(struct ufs_hba *hba, struct ufs_hw_queue *hwq) { - unsigned long completed_reqs; + unsigned long completed_reqs, flags; - spin_lock(&hwq->cq_lock); + spin_lock_irqsave(&hwq->cq_lock, flags); completed_reqs = ufshcd_mcq_poll_cqe_nolock(hba, hwq); - spin_unlock(&hwq->cq_lock); + spin_unlock_irqrestore(&hwq->cq_lock, flags); return completed_reqs; }