Re: file_storage gadget requires a sync...

On Tue, 5 Jun 2007, Guennadi Liakhovetski wrote:

> > When you say the enumeration fails, what exactly goes wrong?  I've 
> > never tried using g_file_storage with a newly-created backing file.
> 
> Ok, the host says:
> 
> 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

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.

Alan Stern


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