Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751457AbbFYGI5 (ORCPT ); Thu, 25 Jun 2015 02:08:57 -0400 Received: from mondschein.lichtvoll.de ([194.150.191.11]:45118 "EHLO mail.lichtvoll.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750968AbbFYGIv (ORCPT ); Thu, 25 Jun 2015 02:08:51 -0400 From: Martin Steigerwald To: Greg Kroah-Hartman Cc: Jeff Chua , Andreas Mohr , lkml , Christoph Hellwig Subject: Re: Stop SSD from waiting for "Spinning up disk..." Date: Thu, 25 Jun 2015 08:08:50 +0200 Message-ID: <2354996.jDU4uRfO83@merkaba> User-Agent: KMail/4.14.10 (Linux/4.1.0-tp520-btrfstrim-pstatetrace+; KDE/4.14.2; x86_64; git-e0fc73a; 2015-06-16) In-Reply-To: <20150625014152.GA9292@kroah.com> References: <20150623182612.GA27461@rhlx01.hs-esslingen.de> <20150625014152.GA9292@kroah.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1928 Lines: 42 Am Mittwoch, 24. Juni 2015, 18:41:52 schrieb Greg Kroah-Hartman: > On Thu, Jun 25, 2015 at 07:55:45AM +0800, Jeff Chua wrote: > > On Thu, Jun 25, 2015 at 12:28 AM, Greg Kroah-Hartman > > > > wrote: > > > On Thu, Jun 25, 2015 at 12:22:47AM +0800, Jeff Chua wrote: > > >> Both sda and sdb have the same SSD model. > > > > > > That's a bug in your USB bridge chip, odds are it is not reporting the > > > value properly. There's nothing the scsi core or USB stack can do > > > about > > > this, sorry. Please complain to the hardware manufacturer. > > > > There are workaround boot cmdline parameters for other things ... any > > chance to consider one to fix broken rotational option? I'm not sure > > how many out there are broken, but I really would like a faster way to > > access my USB SSD without waiting for the "disk spinup". > > Just like module paramaters, boot command lines are not for device > specific attributes, sorry. Again, please contact the manufacturer to > get this fixed. We can't add a quirk for this bridge because it would > not work if you really put a rotational disk behind it. How about a way to override it in sysfs directly during runtime just for a device individually, like choosing an I/O scheduler for example? > Given the cheap cost of these types of bridges, I recommend just getting > one that works. That is an option as well and may educate hardware manufacturers to look a bit better at the quality of those devices (at least then Linux market share in that market increases). Thanks, -- Martin 'Helios' Steigerwald - http://www.Lichtvoll.de GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7 -- 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/