linux-kernel - Re: [PATCH 1/5] pdev: Fix platform device resource linking

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Message-ID: <20130806101914.GH23053@n2100.arm.linux.org.uk>
Date:	Tue, 6 Aug 2013 11:19:14 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Pantelis Antoniou <panto@...oniou-consulting.com>,
	Tony Lindgren <tony@...mide.com>,
	Benoît Coussno <b-cousson@...com>,
	Paul Walmsley <paul@...an.com>,
	Sourav Poddar <sourav.poddar@...com>,
	Russ Dill <Russ.Dill@...com>, Felipe Balbi <balbi@...com>,
	Koen Kooi <koen@...cuitco.com>, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] pdev: Fix platform device resource linking

On Tue, Aug 06, 2013 at 06:15:27PM +0800, Greg Kroah-Hartman wrote:
> On Tue, Aug 06, 2013 at 12:45:42PM +0300, Pantelis Antoniou wrote:
> > What would it take to move all this into driver core?
> 
> What specifically would you move into there?

A variable to hold the streaming dma_mask, so that its in struct device
rather than having to be separate.  Yes, we can keep the pointer in there
too, because that appears to convey meaning in the kernel today - whether
the device can do DMA or not.

A NULL dma_mask pointer already means it can't and dma_set_mask() always
fails.  A non-NULL dma_mask pointer means the driver can use
dma_set_mask() to set an appropriate mask.
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