linux-kernel - Re: [BUG] 2.6.24-git usb reset problems

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Date:	Tue, 29 Jan 2008 08:48:13 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Greg KH <greg@...ah.com>
Cc:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-scsi@...r.kernel.org
Subject: Re: [BUG] 2.6.24-git usb reset problems

On Mon, Jan 28 2008, Greg KH wrote:
> On Mon, Jan 28, 2008 at 09:49:35PM +0100, Jens Axboe wrote:
> > Hi,
> > 
> > Running latest -git (head 91525300baf162e83e923b09ca286f9205e21522) and
> > connecting my cf usb storage device yields and endless stream of:
> > 
> > Initializing USB Mass Storage driver...
> > scsi6 : SCSI emulation for USB Mass Storage devices
> > usb-storage: device found at 2
> > usb-storage: waiting for device to settle before scanning
> > usbcore: registered new interface driver usb-storage
> > USB Mass Storage support registered.
> > scsi 6:0:0:0: Direct-Access     Generic  STORAGE DEVICE   0125 PQ: 0
> > ANSI: 0
> > sd 6:0:0:0: [sdb] 4001760 512-byte hardware sectors (2049 MB)
> > sd 6:0:0:0: [sdb] Write Protect is off
> > sd 6:0:0:0: [sdb] Mode Sense: 02 00 00 00
> > sd 6:0:0:0: [sdb] Assuming drive cache: write through
> > sd 6:0:0:0: [sdb] 4001760 512-byte hardware sectors (2049 MB)
> > sd 6:0:0:0: [sdb] Write Protect is off
> > sd 6:0:0:0: [sdb] Mode Sense: 02 00 00 00
> > sd 6:0:0:0: [sdb] Assuming drive cache: write through
> >  sdb: sdb1
> > sd 6:0:0:0: [sdb] Attached SCSI removable disk
> > sd 6:0:0:0: Attached scsi generic sg1 type 0
> > scsi 6:0:0:1: Direct-Access     Generic  STORAGE DEVICE   0125 PQ: 0
> > ANSI: 0
> > usb 5-1: reset high speed USB device using ehci_hcd and address 2
> > usb 5-1: reset high speed USB device using ehci_hcd and address 2
> > usb 5-1: reset high speed USB device using ehci_hcd and address 2
> > usb 5-1: reset high speed USB device using ehci_hcd and address 2
> > usb 5-1: reset high speed USB device using ehci_hcd and address 2
> > usb 5-1: reset high speed USB device using ehci_hcd and address 2
> > usb 5-1: reset high speed USB device using ehci_hcd and address 2
> > [...]
> > 
> > until I disconnect it. The device doesn't work. Worked fine in 2.6.24.
> > I'm attaching boot messages and my .config.
> 
> That's a bit wierd, as we haven't added any USB patches to the -git tree
> yet after 2.6.24 :)
> 
> Could this be caused by some scsi changes perhaps?

Heh, I guess it could! I'll double check, I reproduced it with two
distinct boots before posting.

-- 
Jens Axboe

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