From patchwork Wed Oct 4 08:58:03 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: 13408453 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 3629AE8FDDE for ; Wed, 4 Oct 2023 08:58:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241855AbjJDI6I (ORCPT ); Wed, 4 Oct 2023 04:58:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52764 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232554AbjJDI6I (ORCPT ); Wed, 4 Oct 2023 04:58:08 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 682F7A6; Wed, 4 Oct 2023 01:58:05 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 640A4C433C7; Wed, 4 Oct 2023 08:58:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1696409885; bh=kaUcGXGYsxr4dX4XEVnR9qTr7F181aGeqx7apSckpUk=; h=From:To:Cc:Subject:Date:From; b=rFSLAVyu5Ug8LIABDlehtbtllCyvihcLuDYMyYhF6viv+XG2VCZu3wOJtch/1otsp KO/Dck3sxvUM4NtvaP7/uKclqkhbe259jZ3wQjwalWSq2sPrMe6ZXsg8xvWIrcCgoJ PrCyO5OiWfVcJ8oiqZkdQ8EBJWKlAyjEvgTRLC+RO608KwDJB9vkW1z1ZO2N9Vs+ox JBl7yqflDHWNCLIvh0AW2G57Vos/uNu44MCUh1iS3ZENkzwRNkOYjr0bdxpHbqtKGX 7DHbbuOHQV7MDxN+k8RtyDHVHV3rxdx/zX4X0IFZH743UbBk1AKdtQdD5W+va6QBEv mmJ5iN63W2a0w== From: Damien Le Moal To: "Martin K . Petersen" , linux-scsi@vger.kernel.org, linux-ide@vger.kernel.org Cc: Petr Tesarik Subject: [PATCH] scsi: Do not rescan devices with a suspended queue Date: Wed, 4 Oct 2023 17:58:03 +0900 Message-ID: <20231004085803.130722-1-dlemoal@kernel.org> X-Mailer: git-send-email 2.41.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Commit ff48b37802e5 ("scsi: Do not attempt to rescan suspended devices") modified scsi_rescan_device() to avoid attempting rescanning a suspended device. However, the modification added a check to verify that a SCSI device is in the running state without checking if the device request queue (in the case of block device) is also running, thus allowing the exectuion of internal requests. Without checking the device request queue, commit ff48b37802e5 fix is incomplete and deadlocks on resume can still happen. Use blk_queue_pm_only() to check if the device request queue allows executing commands in addition to checking the SCSI device state. Reported-by: Petr Tesarik Fixes: ff48b37802e5 ("scsi: Do not attempt to rescan suspended devices") Cc: stable@vger.kernel.org Tested-by: Petr Tesarik Signed-off-by: Damien Le Moal Reviewed-by: Martin K. Petersen --- drivers/scsi/scsi_scan.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c index 3db4d31a03a1..b05a55f498a2 100644 --- a/drivers/scsi/scsi_scan.c +++ b/drivers/scsi/scsi_scan.c @@ -1627,12 +1627,13 @@ int scsi_rescan_device(struct scsi_device *sdev) device_lock(dev); /* - * Bail out if the device is not running. Otherwise, the rescan may - * block waiting for commands to be executed, with us holding the - * device lock. This can result in a potential deadlock in the power - * management core code when system resume is on-going. + * Bail out if the device or its queue are not running. Otherwise, + * the rescan may block waiting for commands to be executed, with us + * holding the device lock. This can result in a potential deadlock + * in the power management core code when system resume is on-going. */ - if (sdev->sdev_state != SDEV_RUNNING) { + if (sdev->sdev_state != SDEV_RUNNING || + blk_queue_pm_only(sdev->request_queue)) { ret = -EWOULDBLOCK; goto unlock; }