linux-kernel - Re: [PATCH] dell_rbu: stop abusing the DMA API

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Message-ID: <20190201231702.GD105752@fedora.eng.vmware.com>
Date:   Fri, 1 Feb 2019 15:17:02 -0800
From:   Darren Hart <dvhart@...radead.org>
To:     Stuart Hayes <stuart.w.hayes@...il.com>
Cc:     Christoph Hellwig <hch@....de>, andy@...radead.org,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dell_rbu: stop abusing the DMA API

On Fri, Feb 01, 2019 at 12:28:46PM -0600, Stuart Hayes wrote:
> 
> On 1/29/2019 1:34 AM, Christoph Hellwig wrote:
> > For some odd reason dell_rbu actually seems to want the physical and
> > not a bus address for the allocated buffer.  Lets assume that actually
> > is correct given that it is BIOS-related and that is a good source
> > of insanity.  In that case we should not use dma_alloc_coherent with
> > a NULL device to allocate memory, but use GFP_DMA32 to stay under
> > the 32-bit BIOS limit.
> > 
> > Signed-off-by: Christoph Hellwig <hch@....de>
> > ---

...

> 
> Acked-by: Stuart Hayes <stuart.w.hayes@...il.com>
> 

Ah, prematurely pulled in Mario - thanks Stuart.

-- 
Darren Hart
VMware Open Source Technology Center