linux-kernel - Re: [PATCH 2.6.22.y] ieee1394: revert "sbp2: enforce 32bit DMA mapping"

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Date:	Mon, 6 Aug 2007 13:58:04 +0200
From:	Olaf Hering <olh@...e.de>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Robert Hancock <hancockr@...w.ca>, linuxppc-dev@...abs.org,
	stable@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.22.y] ieee1394: revert "sbp2: enforce 32bit DMA	mapping"

On Sun, Aug 05, Stefan Richter wrote:

> Benjamin Herrenschmidt wrote:
> >>> If setting 32-bit DMA mask fails on ppc64, that sounds like a problem
> >>> with the DMA implementation on that architecture. There are enough cards
> >>> out there that only support 32-bit DMA that this really needs to work..
> >> Yes, could the PPC folks please have a look at it?  Thanks.
> > 
> > Smells like we may have a bug there. No worries though, all current PPC
> > machines have an iommu that will not give out addresses above 32 bits
> > anyway, but I'll double check what's up.
> > 
> > Do you see something in dmesg when that happens ?
> 
> There was nothing in Olaf's report, except for trouble in sbp2 _after_
> the failure.  http://lkml.org/lkml/2007/8/1/344  (I don't have a PMac.)

sbp2util_remove_command_orb_pool() does not check for lu->hi being NULL.

dev->dma_mask is NULL too, thats why dma_direct_dma_supported() returns
false, and dma_set_mask() will return -EIO.
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