From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tarkan Erimer Subject: [BISECTED] Re: [BUG] Linux-2.6.31-rc1 Fails To Recognize Some USB Disks Date: Fri, 24 Jul 2009 13:55:42 +0300 Message-ID: <4A69932E.90906@turknet.net.tr> References: <4A4472DF.1050900@turknet.net.tr> <4A4878AC.3050208@turknet.net.tr> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: "Martin K. Petersen" , linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org Cc: Matthew Wilcox List-Id: linux-scsi@vger.kernel.org On 06/29/2009 05:30 PM, Martin K. Petersen wrote: > Tarkan> version=0x00 [no conformance claimed] > > Wow, that's super lame. And somewhat odd because WDC are usually pretty > good at USB-SATA bridge protocol compliance. But in any case this is > unrelated to your problems. > > My concern was that our recent changes to the capacity detection in SCSI > failed for your device. However, given your attached log it looks like > it's a USB issue. And rereading your original log it also looks like > you had a USB timeout which coincided with READ CAPACITY failing. > > So I'm deferring to the USB folks. > > Tarkan> [160848.805027] usb 5-8: reset high speed USB device using > Tarkan> ehci_hcd and address 7 > > Martin, Today, I had time to bisect and you were right: The below commit related to capacity detection changes in SCSI subsystem,as you mentioned, seems the cause of the problem. 3821d768912a47ddbd6cab52943a8284df88003c is first bad commit commit 3821d768912a47ddbd6cab52943a8284df88003c Author: Martin K. Petersen Date: Sat May 23 11:43:38 2009 -0400 sd: Detect non-rotational devices Detect non-rotational devices and set the queue flag accordingly. Signed-off-by: Martin K. Petersen Signed-off-by: James Bottomley :040000 040000 f744f08d73f56e6d8461267c8c5bc4c710d4c9dd 89eb1f56a7066a22a9ae6b7b916453a78a9dd082 M drivers