From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760612AbZD2WW2 (ORCPT ); Wed, 29 Apr 2009 18:22:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757739AbZD2WVI (ORCPT ); Wed, 29 Apr 2009 18:21:08 -0400 Received: from kroah.org ([198.145.64.141]:40187 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755818AbZD2WVH (ORCPT ); Wed, 29 Apr 2009 18:21:07 -0400 X-Mailbox-Line: From gregkh@mini.kroah.org Wed Apr 29 15:09:23 2009 Message-Id: <20090429220923.226388330@mini.kroah.org> User-Agent: quilt/0.48-1 Date: Wed, 29 Apr 2009 15:07:02 -0700 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org Cc: Justin Forbes , Zwane Mwaikambo , "Theodore Ts'o" , Randy Dunlap , Dave Jones , Chuck Wolber , Chris Wedgwood , Michael Krufky , Chuck Ebbert , Domenico Andreoli , Willy Tarreau , Rodrigo Rubira Branco , Jake Edge , Eugene Teo , torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Alan Stern , Chris Wright Subject: [patch 03/58] USB: usb-storage: increase max_sectors for tape drives References: <20090429220659.339950874@mini.kroah.org> Content-Disposition: inline; filename=0010-USB-usb-storage-increase-max_sectors-for-tape-driv.patch In-Reply-To: <20090429221657.GA11765@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 2.6.27-stable review patch. If anyone has any objections, please let us know. ------------------ From: Alan Stern upstream commit: 5c16034d73da2c1b663aa25dedadbc533b3d811c This patch (as1203) increases the max_sector limit for USB tape drives. By default usb-storage sets max_sectors to 240 (i.e., 120 KB) for all devices. But tape drives need a higher limit, since tapes can and do have very large block sizes. Without the ability to transfer an entire large block in a single command, such tapes can't be used. This fixes Bugzilla #12207. Signed-off-by: Alan Stern Reported-and-tested-by: Phil Mitchell Cc: stable Signed-off-by: Greg Kroah-Hartman Signed-off-by: Chris Wright --- drivers/usb/storage/scsiglue.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/drivers/usb/storage/scsiglue.c +++ b/drivers/usb/storage/scsiglue.c @@ -135,6 +135,12 @@ static int slave_configure(struct scsi_d if (sdev->request_queue->max_sectors > max_sectors) blk_queue_max_sectors(sdev->request_queue, max_sectors); + } else if (sdev->type == TYPE_TAPE) { + /* Tapes need much higher max_sector limits, so just + * raise it to the maximum possible (4 GB / 512) and + * let the queue segment size sort out the real limit. + */ + blk_queue_max_sectors(sdev->request_queue, 0x7FFFFF); } /* We can't put these settings in slave_alloc() because that gets