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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 07 Aug 2007 07:43:17 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Olaf Hering <olh@...e.de>
Cc:	Stefan Richter <stefanr@...6.in-berlin.de>,
	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 Mon, 2007-08-06 at 13:58 +0200, Olaf Hering wrote:
> 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.

Strange... PCI devices should never have a NULL dma mask. I wonder how
we get there... 

Ben.


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