From: James Bottomley <James.Bottomley@suse.de>
To: 王神 <oujin.rera@gmail.com>
Cc: linux-scsi@vger.kernel.org
Subject: Re: dma_mask on scsi_calculate_bounce_limit
Date: Thu, 18 Nov 2010 18:52:24 -0600 [thread overview]
Message-ID: <1290127944.11007.46.camel@mulgrave.site> (raw)
In-Reply-To: <AANLkTinHZC9iFjG1wyJTrRN_aMRkaGUgH=n2CF0wUG8f@mail.gmail.com>
On Fri, 2010-11-19 at 01:54 +0800, 王神 wrote:
> On Thu, Nov 18, 2010 at 11:21 PM, James Bottomley
> <James.Bottomley@suse.de> wrote:
> > On Thu, 2010-11-18 at 14:20 +0530, 王神 wrote:
> >> Hi
> >>
> >> I have enabled DMA for my host device and when i connect a scsi device
> >> to the host, it crashes in the following code..
> >>
> >> Function: scsi_calculate_bounce_limit
> >>
> >> if (host_dev && host_dev->dma_mask)
> >> bounce_limit = *host_dev->dma_mask;
> >>
> >> "*dma_mask" is illegal pointer operation. I would like to understand
> >> is this known and is there reason behind such a code ?
> >
> > It likely means you're operating on a new architecture and its generic
> > devices haven't been set up correctly.
>
> Could you please more specific on what is generic devices haven't been
> setup properly...
It means the architecture setup code left a NULL pointer in the generic
device which shouldn't be there ... without knowing which architecture
and seeing the code, it's pretty impossible to be more specific.
James
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next prev parent reply other threads:[~2010-11-19 0:52 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-18 8:50 dma_mask on scsi_calculate_bounce_limit 王神
2010-11-18 15:21 ` James Bottomley
2010-11-18 17:54 ` 王神
2010-11-19 0:52 ` James Bottomley [this message]
2010-11-19 6:41 ` 王神
2010-11-19 15:13 ` Douglas Gilbert
2010-11-19 15:15 ` James Bottomley
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