Re: file_storage gadget requires a sync...

Alan Stern <[email protected]>
Newsgroups gmane.linux.usb.devel
Message-ID <[email protected]>
On Tue, 5 Jun 2007, Guennadi Liakhovetski wrote:

> Hi
> 
> I see a ~100% reproducible problem under 2.6.20 with g_file_storage: the 
> script
> 
> cp fs.image /tmp/
> modprobe g_file_storage file=/tmp/fs.image
> 
> comes with no error back, but the enumeration fails. Whereas inserting a 
> sync between the "cp" and "modprobe" fixes it... It worked without sync 
> under 2.4.30. Filesystem is ext3 mounted with default parameters 
> (rw,data=ordered), gadget driver net2280, i386 platform. Is this intended 
> behaviour?

Yes, of course we always write device drivers so that they will fail in 
unexpected ways unless the user does something unintuitive and 
undocumented.  :-)

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

Alan Stern


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