From patchwork Thu Oct 8 16:54:51 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vitaly Kuznetsov X-Patchwork-Id: 7354241 Return-Path: X-Original-To: patchwork-linux-scsi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id CD5C7BEEA4 for ; Thu, 8 Oct 2015 16:55:17 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id EF5AD207E7 for ; Thu, 8 Oct 2015 16:55:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 222672078D for ; Thu, 8 Oct 2015 16:55:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934038AbbJHQyz (ORCPT ); Thu, 8 Oct 2015 12:54:55 -0400 Received: from mx1.redhat.com ([209.132.183.28]:42772 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933270AbbJHQyy (ORCPT ); Thu, 8 Oct 2015 12:54:54 -0400 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (Postfix) with ESMTPS id 7EA928F2E4; Thu, 8 Oct 2015 16:54:54 +0000 (UTC) Received: from vitty.brq.redhat.com (vitty.brq.redhat.com [10.34.26.3]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id t98Gsqqh011495; Thu, 8 Oct 2015 12:54:53 -0400 From: Vitaly Kuznetsov To: "James E.J. Bottomley" Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, "K. Y. Srinivasan" , Long Li , Dexuan Cui Subject: [PATCH v3] scsi: report 'INQUIRY result too short' once per host Date: Thu, 8 Oct 2015 18:54:51 +0200 Message-Id: <1444323291-16447-1-git-send-email-vkuznets@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.24 Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Some host adapters (e.g. Hyper-V storvsc) are known for not respecting the SPC-2/3/4 requirement for 'INQUIRY data (see table ...) shall contain at least 36 bytes'. As a result we get tons on 'scsi 0:7:1:1: scsi scan: INQUIRY result too short (5), using 36' messages on console. This can be problematic for slow consoles. Introduce short_inquiry flag in struct Scsi_Host to print the message once per host. Signed-off-by: Vitaly Kuznetsov --- Changes since v2: - This is a successor of previously sent (and still not merged) "scsi: introduce short_inquiry flag for broken host adapters" patch. I'm not particularly sure which solution is better but I'm leaning towards this one as it doesn't require changes to adapter drivers. --- drivers/scsi/scsi_scan.c | 9 ++++++--- include/scsi/scsi_host.h | 3 +++ 2 files changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c index f9f3f82..cd347e4 100644 --- a/drivers/scsi/scsi_scan.c +++ b/drivers/scsi/scsi_scan.c @@ -701,9 +701,12 @@ static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result, * strings. */ if (sdev->inquiry_len < 36) { - sdev_printk(KERN_INFO, sdev, - "scsi scan: INQUIRY result too short (%d)," - " using 36\n", sdev->inquiry_len); + if (!sdev->host->short_inquiry) { + shost_printk(KERN_INFO, sdev->host, + "scsi scan: INQUIRY result too short (%d)," + " using 36\n", sdev->inquiry_len); + sdev->host->short_inquiry = 1; + } sdev->inquiry_len = 36; } diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index e113c75..3a22da7 100644 --- a/include/scsi/scsi_host.h +++ b/include/scsi/scsi_host.h @@ -673,6 +673,9 @@ struct Scsi_Host { unsigned use_blk_mq:1; unsigned use_cmd_list:1; + /* Host responded with short (<36 bytes) INQUIRY result */ + unsigned short_inquiry:1; + /* * Optional work queue to be utilized by the transport */