From: James Bottomley <James.Bottomley@SteelEye.com>
To: "Anil K. Ravindranath" <anil_ravindranath@adaptec.com>
Cc: Linux-scsi@vger.kernel.org
Subject: Re: [PATCH] aic7xxx driver. Restrict DMA to 32bit for 29320LPE Adaptec SCSI controller
Date: Thu, 20 Sep 2007 19:41:47 -0500 [thread overview]
Message-ID: <1190335307.3360.66.camel@localhost.localdomain> (raw)
In-Reply-To: <1190300889.31372.4.camel@linux.site>
On Thu, 2007-09-20 at 08:08 -0700, Anil K. Ravindranath wrote:
> Hi,
>
> We have not heard any comments or inputs on this patch.
>
> With regards,
> Anil
>
> On Sat, 2007-06-30 at 05:45 -0700, Anil K. Ravindranath wrote:
> > Subject: [PATCH] aic7xxx driver. Restrict DMA to 32bit for 29320LPE
> > Adaptec SCSI controller
> >
> > Contribution:
> >
> > Anil Ravindranath <anil_ravindranath@adaptec.com>
> >
> > Issue:
> >
> > Data Bursts that cross from 32- to 64-Bit address space have incorrect
> > address for 29320LPE. This leads to potential data corruption.
Where do you think you see this happening? The block layer has a
dma_boundary parameter (basically a mask which it refuses to allow dma
to cross). By default this is set to 4GB (because a lot of PCI cards
have difficulty going from non-DAC to DAC). The aic79xx driver does
nothing to alter this, so you shouldn't be seeing any DMA segments
crossing the 4GB boundary.
James
next prev parent reply other threads:[~2007-09-21 0:41 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-30 12:45 [PATCH] aic7xxx driver. Restrict DMA to 32bit for 29320LPE Adaptec SCSI controller Anil K. Ravindranath
2007-09-20 15:08 ` Anil K. Ravindranath
2007-09-21 0:41 ` James Bottomley [this message]
[not found] ` <1190305223.1588.7.camel@linux.site>
2007-09-21 15:37 ` James Bottomley
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