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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 5FDB0C433E0 for ; Tue, 26 May 2020 19:08:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 316CB208B3 for ; Tue, 26 May 2020 19:08:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590520105; bh=1SXGO42ArmKLcBXx+m3RGId2KHzSNDSpEYoeyqJ7ot4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=NfGAeBZFXvU7jPzK0cqCpCWWdxzYloWhch6JBBMPvkE34EjldhYL+p7qk8A+bkV/X S20LesuRGWVg/DkcSbQCQpLtv6mcCdlw+sldPYkLuX1MNFK9mw0Sre7oT6M/wjR3yq ab5ixkmSi04SLqodqjfQIa14FY01TkmC0ehdOIlQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391429AbgEZTIY (ORCPT ); Tue, 26 May 2020 15:08:24 -0400 Received: from mail.kernel.org ([198.145.29.99]:37254 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2403900AbgEZTIU (ORCPT ); Tue, 26 May 2020 15:08:20 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3223B208A7; Tue, 26 May 2020 19:08:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1590520099; bh=1SXGO42ArmKLcBXx+m3RGId2KHzSNDSpEYoeyqJ7ot4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=K2jC8Ifsqw3Yo8EVDCxUGBNF+lomFsjWpvHl0+4vsSSV7rY+Lmh/EnJNuKmNeRW9F XZA+3ohqZYi28xHMn5hhSOu16So/WiKo06WRVe0tuieTPAhypT9Ksc9lRrNtvZGCSg BJJXotDrAA3yojQqtvdGtwDotII49Oj6kXNM2C2I= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tyrel Datwyler , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 5.4 031/111] scsi: ibmvscsi: Fix WARN_ON during event pool release Date: Tue, 26 May 2020 20:52:49 +0200 Message-Id: <20200526183935.754585837@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200526183932.245016380@linuxfoundation.org> References: <20200526183932.245016380@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tyrel Datwyler [ Upstream commit b36522150e5b85045f868768d46fbaaa034174b2 ] While removing an ibmvscsi client adapter a WARN_ON like the following is seen in the kernel log: drmgr: drmgr: -r -c slot -s U9080.M9S.783AEC8-V11-C11 -w 5 -d 1 WARNING: CPU: 9 PID: 24062 at ../kernel/dma/mapping.c:311 dma_free_attrs+0x78/0x110 Supported: No, Unreleased kernel CPU: 9 PID: 24062 Comm: drmgr Kdump: loaded Tainted: G X 5.3.18-12-default NIP: c0000000001fa758 LR: c0000000001fa744 CTR: c0000000001fa6e0 REGS: c0000002173375d0 TRAP: 0700 Tainted: G X (5.3.18-12-default) MSR: 8000000000029033 CR: 28088282 XER: 20000000 CFAR: c0000000001fbf0c IRQMASK: 1 GPR00: c0000000001fa744 c000000217337860 c00000000161ab00 0000000000000000 GPR04: 0000000000000000 c000011e12250000 0000000018010000 0000000000000000 GPR08: 0000000000000000 0000000000000001 0000000000000001 c0080000190f4fa8 GPR12: c0000000001fa6e0 c000000007fc2a00 0000000000000000 0000000000000000 GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 GPR24: 000000011420e310 0000000000000000 0000000000000000 0000000018010000 GPR28: c00000000159de50 c000011e12250000 0000000000006600 c000011e5c994848 NIP [c0000000001fa758] dma_free_attrs+0x78/0x110 LR [c0000000001fa744] dma_free_attrs+0x64/0x110 Call Trace: [c000000217337860] [000000011420e310] 0x11420e310 (unreliable) [c0000002173378b0] [c0080000190f0280] release_event_pool+0xd8/0x120 [ibmvscsi] [c000000217337930] [c0080000190f3f74] ibmvscsi_remove+0x6c/0x160 [ibmvscsi] [c000000217337960] [c0000000000f3cac] vio_bus_remove+0x5c/0x100 [c0000002173379a0] [c00000000087a0a4] device_release_driver_internal+0x154/0x280 [c0000002173379e0] [c0000000008777cc] bus_remove_device+0x11c/0x220 [c000000217337a60] [c000000000870fc4] device_del+0x1c4/0x470 [c000000217337b10] [c0000000008712a0] device_unregister+0x30/0xa0 [c000000217337b80] [c0000000000f39ec] vio_unregister_device+0x2c/0x60 [c000000217337bb0] [c00800001a1d0964] dlpar_remove_slot+0x14c/0x250 [rpadlpar_io] [c000000217337c50] [c00800001a1d0bcc] remove_slot_store+0xa4/0x110 [rpadlpar_io] [c000000217337cd0] [c000000000c091a0] kobj_attr_store+0x30/0x50 [c000000217337cf0] [c00000000057c934] sysfs_kf_write+0x64/0x90 [c000000217337d10] [c00000000057be10] kernfs_fop_write+0x1b0/0x290 [c000000217337d60] [c000000000488c4c] __vfs_write+0x3c/0x70 [c000000217337d80] [c00000000048c648] vfs_write+0xd8/0x260 [c000000217337dd0] [c00000000048ca8c] ksys_write+0xdc/0x130 [c000000217337e20] [c00000000000b488] system_call+0x5c/0x70 Instruction dump: 7c840074 f8010010 f821ffb1 20840040 eb830218 7c8407b4 48002019 60000000 2fa30000 409e003c 892d0988 792907e0 <0b090000> 2fbd0000 419e0028 2fbc0000 ---[ end trace 5955b3c0cc079942 ]--- rpadlpar_io: slot U9080.M9S.783AEC8-V11-C11 removed This is tripped as a result of irqs being disabled during the call to dma_free_coherent() by release_event_pool(). At this point in the code path we have quiesced the adapter and it is overly paranoid to be holding the host lock. [mkp: fixed build warning reported by sfr] Link: https://lore.kernel.org/r/1588027793-17952-1-git-send-email-tyreld@linux.ibm.com Signed-off-by: Tyrel Datwyler Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/ibmvscsi/ibmvscsi.c | 4 ---- 1 file changed, 4 deletions(-) diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c index 7f66a7783209..59f0f1030c54 100644 --- a/drivers/scsi/ibmvscsi/ibmvscsi.c +++ b/drivers/scsi/ibmvscsi/ibmvscsi.c @@ -2320,16 +2320,12 @@ static int ibmvscsi_probe(struct vio_dev *vdev, const struct vio_device_id *id) static int ibmvscsi_remove(struct vio_dev *vdev) { struct ibmvscsi_host_data *hostdata = dev_get_drvdata(&vdev->dev); - unsigned long flags; srp_remove_host(hostdata->host); scsi_remove_host(hostdata->host); purge_requests(hostdata, DID_ERROR); - - spin_lock_irqsave(hostdata->host->host_lock, flags); release_event_pool(&hostdata->pool, hostdata); - spin_unlock_irqrestore(hostdata->host->host_lock, flags); ibmvscsi_release_crq_queue(&hostdata->queue, hostdata, max_events); -- 2.25.1