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=-11.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 0D21FC43465 for ; Mon, 21 Sep 2020 16:58:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C0543235FD for ; Mon, 21 Sep 2020 16:58:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600707515; bh=W9n73qY6qp2I3+5JwnVJVsiwZOK3YAjmSvvyOFDMwWQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=hGFLRqOGkmFBMpIjWu4Y5Ue4awS+9bO+pVgOHOpRkYFPikEWQHH4WMeRmrKrn4qJO S8I5702XrRJEsUJtwLrLdVbg4vWEWkclqvJrL4DFPhFB6KQsIBTCmt9jq1LmW9tPpK zquhEgxb+RFWwB5Y0kjUU976wV0RVjQFMeo1i9Pw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730267AbgIUQ6e (ORCPT ); Mon, 21 Sep 2020 12:58:34 -0400 Received: from mail.kernel.org ([198.145.29.99]:46078 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728566AbgIUQmF (ORCPT ); Mon, 21 Sep 2020 12:42:05 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (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 490BC2076B; Mon, 21 Sep 2020 16:42:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600706524; bh=W9n73qY6qp2I3+5JwnVJVsiwZOK3YAjmSvvyOFDMwWQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IPpanMckZvSikON7e74VGg077LkYlZ50Ft/DIYDvs2fCcVhOt3DWa6uLf/CRSV3wX 2JWPxZDK6lJCYX9WAWCnu0nRPeqAqSRd5PHXOhyo7WqsRNgXoZ/Ma7M1Px6H15zebZ ohY/TyAC+6DJoryZ0fYVTULxTj99SihZEaeXyanA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Oliver Neukum Subject: [PATCH 4.19 38/49] USB: UAS: fix disconnect by unplugging a hub Date: Mon, 21 Sep 2020 18:28:22 +0200 Message-Id: <20200921162036.357320629@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200921162034.660953761@linuxfoundation.org> References: <20200921162034.660953761@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Oliver Neukum commit 325b008723b2dd31de020e85ab9d2e9aa4637d35 upstream. The SCSI layer can go into an ugly loop if you ignore that a device is gone. You need to report an error in the command rather than in the return value of the queue method. We need to specifically check for ENODEV. The issue goes back to the introduction of the driver. Fixes: 115bb1ffa54c3 ("USB: Add UAS driver") Signed-off-by: Oliver Neukum Cc: stable Link: https://lore.kernel.org/r/20200916094026.30085-2-oneukum@suse.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/storage/uas.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) --- a/drivers/usb/storage/uas.c +++ b/drivers/usb/storage/uas.c @@ -669,8 +669,7 @@ static int uas_queuecommand_lck(struct s if (devinfo->resetting) { cmnd->result = DID_ERROR << 16; cmnd->scsi_done(cmnd); - spin_unlock_irqrestore(&devinfo->lock, flags); - return 0; + goto zombie; } /* Find a free uas-tag */ @@ -706,6 +705,16 @@ static int uas_queuecommand_lck(struct s cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB); err = uas_submit_urbs(cmnd, devinfo); + /* + * in case of fatal errors the SCSI layer is peculiar + * a command that has finished is a success for the purpose + * of queueing, no matter how fatal the error + */ + if (err == -ENODEV) { + cmnd->result = DID_ERROR << 16; + cmnd->scsi_done(cmnd); + goto zombie; + } if (err) { /* If we did nothing, give up now */ if (cmdinfo->state & SUBMIT_STATUS_URB) { @@ -716,6 +725,7 @@ static int uas_queuecommand_lck(struct s } devinfo->cmnd[idx] = cmnd; +zombie: spin_unlock_irqrestore(&devinfo->lock, flags); return 0; }