From patchwork Mon Mar 15 13:57:17 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 401413 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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, 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 E3039C4151A for ; Mon, 15 Mar 2021 14:01:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C549664EF3 for ; Mon, 15 Mar 2021 14:01:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230526AbhCOOBl (ORCPT ); Mon, 15 Mar 2021 10:01:41 -0400 Received: from mail.kernel.org ([198.145.29.99]:35610 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231194AbhCON7p (ORCPT ); Mon, 15 Mar 2021 09:59:45 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 9804564F8A; Mon, 15 Mar 2021 13:59:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1615816767; bh=zJJqv1au8T2Aftr308VbtrTbCbQQoC+l6IxVVm6AkbY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eWPGxL7dOPvlJhfmeANrYFNpDe8ZtcnNo7W4cZXrRsFI5bjugO1gvbCSiinCQtO/f svh4xgwgk4ZL1wIVNuBkvjF0CzAArq+sq5kkMIhHqueTBp6U37cdymcN8Ph5utzwUG SuWusdmup1NGxqZggaWz4ypfhR3VpEZOyCyDU6ME= From: gregkh@linuxfoundation.org To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Stefan Haberland , Bjoern Walk , Jan Hoeppner , Jens Axboe Subject: [PATCH 4.14 47/95] s390/dasd: fix hanging IO request during DASD driver unbind Date: Mon, 15 Mar 2021 14:57:17 +0100 Message-Id: <20210315135741.815725628@linuxfoundation.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210315135740.245494252@linuxfoundation.org> References: <20210315135740.245494252@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Greg Kroah-Hartman From: Stefan Haberland commit 66f669a272898feb1c69b770e1504aa2ec7723d1 upstream. Prevent that an IO request is build during device shutdown initiated by a driver unbind. This request will never be able to be processed or canceled and will hang forever. This will lead also to a hanging unbind. Fix by checking not only if the device is in READY state but also check that there is no device offline initiated before building a new IO request. Fixes: e443343e509a ("s390/dasd: blk-mq conversion") Cc: # v4.14+ Signed-off-by: Stefan Haberland Tested-by: Bjoern Walk Reviewed-by: Jan Hoeppner Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- drivers/s390/block/dasd.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -2998,7 +2998,8 @@ static blk_status_t do_dasd_request(stru basedev = block->base; spin_lock_irq(&dq->lock); - if (basedev->state < DASD_STATE_READY) { + if (basedev->state < DASD_STATE_READY || + test_bit(DASD_FLAG_OFFLINE, &basedev->flags)) { DBF_DEV_EVENT(DBF_ERR, basedev, "device not ready for request %p", req); rc = BLK_STS_IOERR;