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

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Date:	Wed, 10 Oct 2012 22:34:59 +0200
From:	Peter Stuge <peter@...ge.se>
To:	Henrik Rydberg <rydberg@...omail.se>
Cc:	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

Hej Henrik,

Henrik Rydberg wrote:
> commit 3d97ff63f8997761f12c8fbe8082996c6eeaba1a
> Author: Hans de Goede <hdegoede@...hat.com>
> Date:   Wed Jul 4 09:18:03 2012 +0200
> 
>     usbdevfs: Use scatter-gather lists for large bulk transfers
>     
> breaks an usb programming cable over here. The problem is reported as
> "bulk tranfer failed" [sic] by the tool, and bisection leads to this
> commit. Reverting on top of 3.6 solves it for me.
> 
> I am happy to test alternatives.

In order to make full use of the new kernel commit you also need
changes in libusb, if the tool uses libusb, but I agree that the
kernel change must under no circumstance cause existing userland
software to regress.

What is the programming cable and software that uses it?


//Peter
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