Re: [PATCH 14/16] USB: Add usbfs ioctl to get the frame number

On Sat, May 12, 2007 at 12:44:38AM -0700, Pete Zaitcev wrote:
> On Fri, 11 May 2007 23:23:18 -0700, Greg KH <[email protected]> wrote:
> 
> > I thought that you needed to do something with this value pretty
> > quickly, and that by the time you were able to send something back into
> > the kernel, the value would be not correct anymore.  But if this is
> > really just like a timestamp, then ok, I have no objection other than it
> > needs to be correct for all host controllers.
> 
> Greg, I'm sorry if I'm wrong, but it looks you missed the funny part.
> Danny's device remembers the value that HC circulated in the SOF frame.
> It then supplies that value alongside some data it returns. By reading
> the "current" frame number from HC, Danny's application can tell
> how many frames back, approximately, these data were generated
> (this is not the time when it was transferred across USB).

Ah, yeah, I missed that.

If Alan fixes up the hcds, I'll take the patch.

thanks,

greg k-h

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