Re: file_storage gadget requires a sync...

On Tue, 5 Jun 2007, Alan Stern wrote:

> On Tue, 5 Jun 2007, Guennadi Liakhovetski wrote:
> 
> > usb usb1: wakeup_rh (auto-start)
> > hub 1-0:1.0: state 7 ports 2 chg 0000 evt 0004
> > uhci_hcd 0000:00:1f.2: port 2 portsc 0093,00
> > hub 1-0:1.0: port 2, status 0101, change 0001, 12 Mb/s
> > hub 1-0:1.0: debounce: port 2: total 100ms stable 100ms status 0x101
> > usb 1-2: new full speed USB device using uhci_hcd and address 69
> > usb 1-2: default language 0x0409
> > usb 1-2: new device strings: Mfr=1, Product=2, SerialNumber=3
> > usb 1-2: Product: File-backed Storage Gadget
> > usb 1-2: Manufacturer: Linux 2.6.20.1-rt8-dsa-mftd2x-2 with net2280
> > usb 1-2: SerialNumber: 3238204E6F76
> > usb 1-2: uevent
> > usb 1-2: configuration #1 chosen from 1 choice
> > usb 1-2: khubd timed out on ep0out len=0/0
> > usb 1-2: can't set config #1, error -110
> > drivers/usb/core/inode.c: creating file '069'
> > hub 1-0:1.0: state 7 ports 2 chg 0000 evt 0004
> > 
> > and on USB-analyser I see an invalid out-transaction with an "invalid 
> > toggle" and a setup transactio with only NAKs.
> 
> This looks like it has nothing to do with using "sync" or newly-created 
> backing files.  Instead it resembles a problem for which a patch was 
> recently submitted:
> 
> 	http://marc.info/?l=linux-usb-devel&m=118053809808501&w=2

Emn, how recent are those signal-handling changes? Remember, the kernel on 
the gadget is only 2.6.20.1. And macroscopically it is indeed 100% 
repropducible - with and without sync. Can it really be explained by this 
signal-handling problem?

> It hasn't been accepted yet, unfortunately.  If you can confirm that it 
> fixes your problem, I'll urge Greg to merge it in time for 2.6.22.

I'll try to test it tomorrow.

Thanks
Guennadi
---------------------------------
Guennadi Liakhovetski, Ph.D.
DSA Daten- und Systemtechnik GmbH
Pascalstr. 28
D-52076 Aachen
Germany

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