linux-kernel - Re: [PATCH -mm 1/4] DMA-API.txt: add dma_sync

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Message-Id: <1265254475.2873.1716.camel@mulgrave.site>
Date:	Wed, 03 Feb 2010 21:34:35 -0600
From:	James Bottomley <James.Bottomley@...e.de>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	davem@...emloft.net, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH -mm 1/4] DMA-API.txt: add dma_sync_single/sg API
 description

On Thu, 2010-02-04 at 12:31 +0900, FUJITA Tomonori wrote:
> On Wed, 03 Feb 2010 19:21:23 -0800 (PST)
> David Miller <davem@...emloft.net> wrote:
> 
> > From: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> > Date: Thu,  4 Feb 2010 12:13:22 +0900
> > 
> > > This adds the description of the following eight function:
> > > 
> > > dma_sync_single_for_cpu
> > > pci_dma_sync_single_for_cpuvoid
> >                              ^^^^
> > 
> > That "void" is probably some cut and paste error :-)
> 
> Oops.
> 
> 
> > > dma_sync_single_for_device
> > > pci_dma_sync_single_for_device
> > > dma_sync_sg_for_cpu
> > > pci_dma_sync_sg_for_cpu
> > > dma_sync_sg_for_device
> > > pci_dma_sync_sg_for_device
> > > 
> > > It was unclear that the API permits a partial sync (some network
> > > drivers already do though). I made it clear that the sync_single API
> > > can do a partial sync but the sync_sg API can't.
> > > 
> > > We could do a partial sync with the sync_sg too, however, it's
> > > difficult for driver writers to correctly use the sync_sg API for a
> > > partial sync since the scatterlists passed in to the mapping API can
> > > be modified. It's unlikely that driver writers want to do a partial
> > > sync with the sync_sg API (because the sync_sg API are usually used
> > > for block drivers). So I think that it's better to forbid a partial
> > > sync with the sync_sg API.
> > > 
> > > Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> > 
> > Acked-by: David S. Miller <davem@...emloft.net>
> 
> Thanks,
> 
> I found other two typos in the commit log so here's the update.
> 
> =
> From: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> Subject: [PATCH -mm 1/4] DMA-API.txt: add dma_sync_single/sg API description
> 
> This adds the description of the following eight function:
> 
> dma_sync_single_for_cpu
> pci_dma_sync_single_for_cpu
> dma_sync_single_for_device
> pci_dma_sync_single_for_device
> dma_sync_sg_for_cpu
> pci_dma_sync_sg_for_cpu
> dma_sync_sg_for_device
> pci_dma_sync_sg_for_device
> 
> It was unclear that the API permits a partial sync (some network
> drivers already do though). I made it clear that the sync_single API
> can do a partial sync but the sync_sg API can't.
> 
> We could do a partial sync with the sync_sg API too, however, it's
> difficult for driver writers to correctly use the sync_sg API for a
> partial sync since the scatterlists passed in to the mapping API can't
> be modified. It's unlikely that driver writers want to do a partial
> sync with the sync_sg API (because the sync_sg API are usually used
> for block drivers). So I think that it's better to forbid a partial
> sync with the sync_sg API.
> 
> Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
> Acked-by: David S. Miller <davem@...emloft.net>
> Cc: James Bottomley <James.Bottomley@...e.de>

For what it's worth, you can add my acked by to both patches too.

James


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