[BISECTED] Re: [BUG] Linux-2.6.31-rc1 Fails To Recognize Some USB Disks

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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 <martin.petersen@xxxxxxxxxx>
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 <martin.petersen@xxxxxxxxxx>
    Signed-off-by: James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>

:040000 040000 f744f08d73f56e6d8461267c8c5bc4c710d4c9dd 89eb1f56a7066a22a9ae6b7b916453a78a9dd082 M drivers





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