Re: USB contigmalloc()

[Christoph Egger <Christoph_Egger%gmx.de@localhost>]

On 12/02/11 10:20, matthew green wrote:
> > On Fri, Dec 02, 2011 at 01:51:42AM +0900, Izumi Tsutsui wrote:
> > > Anyway, currently our udl(4) doesn't require such allocation,
> >
> > It's also a problem for radeondrm (no USB involved).
>
> freebsd implemented a different fix for this, which i think involved
> using the VM system directly and supporting SG properly, but i never
> got around to looking at the code directly.
>
> i keep considering adding a hack to radeondrm to not free the dma
> ram on last close() so that restarts work (but starting for the
> first time later may fail) but if someone wants to fix it properly
> befire i do that, i'd not complain.

jmorse@ wrote a patch which implements support for multiple segments:
http://www.netbsd.org/~cegger/usb.diff

Christoph