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 B6044C43466 for ; Mon, 21 Sep 2020 16:33:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 70789239D3 for ; Mon, 21 Sep 2020 16:33:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600706015; bh=gaKloBMiaI+64bFYvsMOIWjVJrHJTuVAg0Lb0PKDyQw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=kd+mZE6G0RudFSoK2+zpBFcAletNdvkZpxJEvJGJFqYG/Os6fQZAxxfh14usw4ZkT dEOBvCLs9lyrhxzto9tbPW3rt7DiKixkMcadZFiNz5BVmUACsltnENg9Ygc2iHOCSZ xeeGY/+aZfQyJiiQBmA19yLe2bvNNfhcUbZbcmuE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727745AbgIUQdd (ORCPT ); Mon, 21 Sep 2020 12:33:33 -0400 Received: from mail.kernel.org ([198.145.29.99]:59614 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726886AbgIUQd1 (ORCPT ); Mon, 21 Sep 2020 12:33:27 -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 D9923239A1; Mon, 21 Sep 2020 16:33:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600706006; bh=gaKloBMiaI+64bFYvsMOIWjVJrHJTuVAg0Lb0PKDyQw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FxayrAAOGRUCQbW3/sEeVkkUyXY0uJqcRbJQYpi78I38H6xTc4XHRIvEFUaVYaPpq 0E8a7oQ1snjWNJEp/Abl1wF2h58ZvQHjC4bYy15s5I0gBd7FTLbO493vSB24BoUjwn qplrPgCGr09ydZoiHa10MtVTdq5y0/8bhFxZUoNs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Oliver Neukum Subject: [PATCH 4.4 40/46] USB: UAS: fix disconnect by unplugging a hub Date: Mon, 21 Sep 2020 18:27:56 +0200 Message-Id: <20200921162035.114654117@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200921162033.346434578@linuxfoundation.org> References: <20200921162033.346434578@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 @@ -646,8 +646,7 @@ 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 */ @@ -682,6 +681,16 @@ static int uas_queuecommand_lck(struct s cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB); err = uas_submit_urbs(cmnd, devinfo, GFP_ATOMIC); + /* + * 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) { @@ -692,6 +701,7 @@ static int uas_queuecommand_lck(struct s } devinfo->cmnd[idx] = cmnd; +zombie: spin_unlock_irqrestore(&devinfo->lock, flags); return 0; }