From patchwork Mon Mar 15 13:57:16 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 401410 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 DC38CC2BBCD for ; Mon, 15 Mar 2021 14:01:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B886364EF1 for ; Mon, 15 Mar 2021 14:01:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233454AbhCOOBm (ORCPT ); Mon, 15 Mar 2021 10:01:42 -0400 Received: from mail.kernel.org ([198.145.29.99]:36622 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232757AbhCON7l (ORCPT ); Mon, 15 Mar 2021 09:59:41 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id E42D664F75; Mon, 15 Mar 2021 13:59:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1615816765; bh=WmxsyXZaGuqzBHTg7H7zF124/i5Yo16djBp6yK0QzCA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=J/wlUBDfNJYXMCxBLM/XrsSsdO1QxAEoFW0yQ48YNvG92b6UPb/Kq4BmahdJvchDP QE1Rhwbfqfs7EU9UkHUt8Fbs51I3Rc0xROyU6JhWy8jpxhqrlwoHB2ZR9gIaPioQBj C8n1m5U9EzNV+sOF9OqwHu/lW1tSukd3coDaJoz4= 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 46/95] s390/dasd: fix hanging DASD driver unbind Date: Mon, 15 Mar 2021 14:57:16 +0100 Message-Id: <20210315135741.786571914@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 7d365bd0bff3c0310c39ebaffc9a8458e036d666 upstream. In case of an unbind of the DASD device driver the function dasd_generic_remove() is called which shuts down the device. Among others this functions removes the int_handler from the cdev. During shutdown the device cancels all outstanding IO requests and waits for completion of the clear request. Unfortunately the clear interrupt will never be received when there is no interrupt handler connected. Fix by moving the int_handler removal after the call to the state machine where no request or interrupt is outstanding. Cc: stable@vger.kernel.org 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, 1 insertion(+), 2 deletions(-) --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -3489,8 +3489,6 @@ void dasd_generic_remove(struct ccw_devi struct dasd_device *device; struct dasd_block *block; - cdev->handler = NULL; - device = dasd_device_from_cdev(cdev); if (IS_ERR(device)) { dasd_remove_sysfs_files(cdev); @@ -3509,6 +3507,7 @@ void dasd_generic_remove(struct ccw_devi * no quite down yet. */ dasd_set_target_state(device, DASD_STATE_NEW); + cdev->handler = NULL; /* dasd_delete_device destroys the device reference. */ block = device->block; dasd_delete_device(device);