From patchwork Tue Sep 26 08:14:46 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Damien Le Moal X-Patchwork-Id: 727034 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 DAA7CE7D252 for ; Tue, 26 Sep 2023 08:15:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233917AbjIZIPZ (ORCPT ); Tue, 26 Sep 2023 04:15:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50782 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232778AbjIZIPV (ORCPT ); Tue, 26 Sep 2023 04:15:21 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 62F30101; Tue, 26 Sep 2023 01:15:14 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7A15BC433C9; Tue, 26 Sep 2023 08:15:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1695716114; bh=F1kHzoLUbhF3Y8aKwH4/dIwyg9TVGg/PIsUNzSFF1QE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RuZ4hnlrJFz/845mYfeBBB/2i2EHG+9RcWR5/bQkOSLM6LDA73xS7SuJc0S2TWjAo T2DZEdxKHDmeFkm/r3gsr5H8VKch+oiQBONmG26pxYK3VCPbZr+994WKe+q/CHU5Hd X9LyOFQ1+4VqmomHUIUWNjnAKT5D4KYXRHF8v+3BUTzG8cqCSFv2GG/QTM5NN2WWtf NQ2loX2I+uIMUCrynw/XkCwiYM+/Q1/ovfdsukmv3JXxIFyorzWPisx+SlrZlprbnL ftULnZiS9KP3NqbipIdt0WYc55heXrfNO3uYRS4s8qee9wazDSIJ9wV/g4LL+kb3vK bwoS0ZFuKhhEg== From: Damien Le Moal To: linux-ide@vger.kernel.org Cc: linux-scsi@vger.kernel.org, "Martin K . Petersen" , John Garry , Rodrigo Vivi , Paul Ausbeck , Kai-Heng Feng , Joe Breuer , Geert Uytterhoeven , Chia-Lin Kao Subject: [PATCH v7 02/23] ata: libata-core: Fix port and device removal Date: Tue, 26 Sep 2023 17:14:46 +0900 Message-ID: <20230926081507.69346-3-dlemoal@kernel.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230926081507.69346-1-dlemoal@kernel.org> References: <20230926081507.69346-1-dlemoal@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Whenever an ATA adapter driver is removed (e.g. rmmod), ata_port_detach() is called repeatedly for all the adapter ports to remove (unload) the devices attached to the port and delete the port device itself. Removing of devices is done using libata EH with the ATA_PFLAG_UNLOADING port flag set. This causes libata EH to execute ata_eh_unload() which disables all devices attached to the port. ata_port_detach() finishes by calling scsi_remove_host() to remove the scsi host associated with the port. This function will trigger the removal of all scsi devices attached to the host and in the case of disks, calls to sd_shutdown() which will flush the device write cache and stop the device. However, given that the devices were already disabled by ata_eh_unload(), the synchronize write cache command and start stop unit commands fail. E.g. running "rmmod ahci" with first removing sd_mod results in error messages like: ata13.00: disable device sd 0:0:0:0: [sda] Synchronizing SCSI cache sd 0:0:0:0: [sda] Synchronize Cache(10) failed: Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK sd 0:0:0:0: [sda] Stopping disk sd 0:0:0:0: [sda] Start/Stop Unit failed: Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK Fix this by removing all scsi devices of the ata devices connected to the port before scheduling libata EH to disable the ATA devices. Also delete the WAR_ON() call checking that the ATA_PFLAG_UNLOADING flag was cleared as that is done without holding the port lock. Fixes: 720ba12620ee ("[PATCH] libata-hp: update unload-unplug") Cc: stable@vger.kernel.org Signed-off-by: Damien Le Moal Reviewed-by: Hannes Reinecke Reviewed-by: Niklas Cassel Tested-by: Chia-Lin Kao (AceLan) Tested-by: Geert Uytterhoeven Reviewed-by: Martin K. Petersen --- drivers/ata/libata-core.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 732f3d0b4fd9..8e35afe5e560 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -5948,11 +5948,30 @@ static void ata_port_detach(struct ata_port *ap) struct ata_link *link; struct ata_device *dev; - /* tell EH we're leaving & flush EH */ + /* Wait for any ongoing EH */ + ata_port_wait_eh(ap); + + mutex_lock(&ap->scsi_scan_mutex); spin_lock_irqsave(ap->lock, flags); + + /* Remove scsi devices */ + ata_for_each_link(link, ap, HOST_FIRST) { + ata_for_each_dev(dev, link, ALL) { + if (dev->sdev) { + spin_unlock_irqrestore(ap->lock, flags); + scsi_remove_device(dev->sdev); + spin_lock_irqsave(ap->lock, flags); + dev->sdev = NULL; + } + } + } + + /* Tell EH to disable all devices */ ap->pflags |= ATA_PFLAG_UNLOADING; ata_port_schedule_eh(ap); + spin_unlock_irqrestore(ap->lock, flags); + mutex_unlock(&ap->scsi_scan_mutex); /* wait till EH commits suicide */ ata_port_wait_eh(ap);