David Brownell may have more to add, but here's my understanding...

On Sat, 8 Jan 2005, Larry Schiefer wrote:

> The Linux USB website had a short description about a change made to the
> USB 2.0 core and usb-storage drivers to support large I/O scatter lists
> at once.  According to the description, this was introduced in 2.5.45
> and is available in the 2.6 kernels.  Looking through the latest 2.4
> stable release (2.4.28) as well as the MV Linux kernel shows none of the
> scatter-gather changes, so I have the following questions:
> 
> 1. Are there plans to back-port the scatter-gather change to the 2.4
> kernel tree?

No.  2.4 development is pretty much over at this point, consisting of 
almost nothing but bug fixes.

> 2. Is there something in the scatter-gather change that restricts it
> from being back-ported to the 2.4 kernel?

I don't think there are any large barriers.  Small quirks in the behavior 
of the different HCDs might cause minor annoyances.

Alan Stern



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