Date: Tue, 29 Jan 2008 15:11:08 +0100
From: Jens Axboe <jens.axboe@oracle.com>
To: Boaz Harrosh <bharrosh@panasas.com>
Cc: Greg KH <greg@kroah.com>, Matthew Dharm <mdharm-usb@one-eyed-alien.net>,
       linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
       linux-scsi@vger.kernel.org
Subject: Re: [BUG] 2.6.24-git usb reset problems
Message-ID: <20080129141108.GV15220@kernel.dk>
References: <20080128204935.GI15220@kernel.dk> <20080128212114.GA15586@kroah.com> <479F18D3.9030709@panasas.com> <20080129135443.GU15220@kernel.dk> <479F32E9.10609@panasas.com>
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On Tue, Jan 29 2008, Boaz Harrosh wrote:
> On Tue, Jan 29 2008 at 15:54 +0200, Jens Axboe <jens.axboe@oracle.com> wrote:
> > On Tue, Jan 29 2008, Boaz Harrosh wrote:
> >> 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?
> >>>
> >>> thanks,
> >>>
> >>> greg k-h
> >>> -
> >> Yes it is ;)
> >>
> >> Jens could you test the patch below? if it works I'll submit a proper
> >> patch. Please forgive me for the bug.
> > 
> > No difference, still just a lot of resets.
> > 
> Where you able to figure out which usb storage transport is used?
> 
> in drivers/usb/storage/usb.c you have get_protocol() and get_transport()
> functions. I'm not sure if these get stored in sysfs perhaps. This will
> pinpoint better where to look. Let me research a bit. 

Did the quick'n easy and dumped it. Protocol is 'Transparent SCSI' and
transport is 'Bulk'

-- 
Jens Axboe

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