Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933480AbaBUNkU (ORCPT ); Fri, 21 Feb 2014 08:40:20 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:47041 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932325AbaBUMuh (ORCPT ); Fri, 21 Feb 2014 07:50:37 -0500 From: Luis Henriques To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Alan Stern , Matthew Dharm , James Bottomley , Greg Kroah-Hartman , Luis Henriques Subject: [PATCH 3.11 064/121] usb-storage: enable multi-LUN scanning when needed Date: Fri, 21 Feb 2014 12:48:08 +0000 Message-Id: <1392986945-9693-65-git-send-email-luis.henriques@canonical.com> X-Mailer: git-send-email 1.9.0 In-Reply-To: <1392986945-9693-1-git-send-email-luis.henriques@canonical.com> References: <1392986945-9693-1-git-send-email-luis.henriques@canonical.com> X-Extended-Stable: 3.11 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.11.10.5 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Alan Stern commit 823d12c95c666fa7ab7dad208d735f6bc6afabdc upstream. People sometimes create their own custom-configured kernels and forget to enable CONFIG_SCSI_MULTI_LUN. This causes problems when they plug in a USB storage device (such as a card reader) with more than one LUN. Fortunately, we can tell fairly easily when a storage device claims to have more than one LUN. When that happens, this patch asks the SCSI layer to probe all the LUNs automatically, regardless of the config setting. The patch also updates the Kconfig help text for usb-storage, explaining that CONFIG_SCSI_MULTI_LUN may be necessary. Signed-off-by: Alan Stern Reported-by: Thomas Raschbacher CC: Matthew Dharm CC: James Bottomley Signed-off-by: Greg Kroah-Hartman Signed-off-by: Luis Henriques --- drivers/usb/storage/Kconfig | 4 +++- drivers/usb/storage/scsiglue.c | 6 ++++++ 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/usb/storage/Kconfig b/drivers/usb/storage/Kconfig index 8470e1b..1dd0604 100644 --- a/drivers/usb/storage/Kconfig +++ b/drivers/usb/storage/Kconfig @@ -18,7 +18,9 @@ config USB_STORAGE This option depends on 'SCSI' support being enabled, but you probably also need 'SCSI device support: SCSI disk support' - (BLK_DEV_SD) for most USB storage devices. + (BLK_DEV_SD) for most USB storage devices. Some devices also + will require 'Probe all LUNs on each SCSI device' + (SCSI_MULTI_LUN). To compile this driver as a module, choose M here: the module will be called usb-storage. diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c index 5db1532..bb7bf19 100644 --- a/drivers/usb/storage/scsiglue.c +++ b/drivers/usb/storage/scsiglue.c @@ -78,6 +78,8 @@ static const char* host_info(struct Scsi_Host *host) static int slave_alloc (struct scsi_device *sdev) { + struct us_data *us = host_to_us(sdev->host); + /* * Set the INQUIRY transfer length to 36. We don't use any of * the extra data and many devices choke if asked for more or @@ -102,6 +104,10 @@ static int slave_alloc (struct scsi_device *sdev) */ blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1)); + /* Tell the SCSI layer if we know there is more than one LUN */ + if (us->protocol == USB_PR_BULK && us->max_lun > 0) + sdev->sdev_bflags |= BLIST_FORCELUN; + return 0; } -- 1.9.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/