linux-kernel - Re: REGRESSION: usbdevfs: Use-scatter-gather-lists-for-large-bulk-transfers

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Date:	Fri, 12 Oct 2012 06:53:10 +0900
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Henrik Rydberg <rydberg@...omail.se>
Cc:	Hans de Goede <hdegoede@...hat.com>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Peter Stuge <peter@...ge.se>
Subject: Re: REGRESSION: usbdevfs:
 Use-scatter-gather-lists-for-large-bulk-transfers

On Thu, Oct 11, 2012 at 11:37:07PM +0200, Henrik Rydberg wrote:
> Hi Hans,
> 
> > Oh what fun (not). The best way to figure out what really is going
> > on is to get some usb level traces. Note my first hunch is that what
> > you're seeing is a device firmware bug, as this patch together with
> > a new libusb (which you seem to also have) will make bulk transfers
> > run slightly faster, which might be just enough to overwhelm your
> > device ...
> 
> Or, the large bulk transfer actually never worked in the first place.
> The list you gave me seemed boringly long, so I read the patch more
> closely instead. The fix below is the result. Greg, will you please
> take it through your tree?

Henrik, Very nice fix, thanks for debugging this.

Hans, any objection to me taking this?

greg k-h
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