lkml.org 
[lkml]   [2007]   [Oct]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] SPARC64: fix iommu sg chaining
On Wed, Oct 17 2007, David Miller wrote:
> From: Jens Axboe <jens.axboe@oracle.com>
> Date: Wed, 17 Oct 2007 12:58:40 +0200
>
> > The problem is that you cannot zero the entire sg entry, because then
> > you'd potentially overwrite the chain pointer.
> >
> > I'd propose just adding a
> >
> > sg_dma_address(sg) = 0;
> > sg_dma_len(sg) = 0;
> >
> > there for now, or provide an arch_clear_sg_entry() helper if we need
> > more killed.
>
> The "chain pointer" is indicated by an sg->page with the low
> bit set, but we're explicitly initializing it here to a
> non-chain page pointer value.
>
> What's the problem?

See next mail :-)

--
Jens Axboe

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-10-17 13:07    [from the cache]
©2003-2011 Jasper Spaans. Advertise on this site