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

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Message-ID: <20121011215439.GA505@polaris.bitmath.org>
Date:	Thu, 11 Oct 2012 23:54:39 +0200
From:	"Henrik Rydberg" <rydberg@...omail.se>
To:	Hans de Goede <hdegoede@...hat.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: REGRESSION: usbdevfs:
 Use-scatter-gather-lists-for-large-bulk-transfers

On Thu, Oct 11, 2012 at 08:50:33AM +0200, Peter Stuge wrote:
> Henrik Rydberg wrote:
> > > What is the programming cable and software that uses it?
> > 
> > The programmer is impact, using libusbx-1.0.14-1.
> 
> Do you know for a fact that your version calls libusb-1.0? Did you
> establish this with e.g. strace? ISE 11.1 impact uses only libusb.so,
> ie. libusb-0.1.

I modified libusbx during testing, and yes, it is really used.

> > The patch is pretty generic, so I am suprised the problem has not
> > shown up earlier.
> 
> There are several explanations. There is clearly a problem with Hans'
> patch(es) for some cases, but those are perhaps not so common.

As it turned out, all cases of large bulk transfers, so I guess 3.6
has not been that widely tested yet. ;-)

> I've reviewed Hans' patch that he added to libusbx and which is in
> libusbx-1.0.14, but I am not sure that it is correct, which is why
> I haven't included it in libusb yet.

I looked at it for a while, it does seem correct.

Thanks,
Henrik
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