netdev - Re: [RFC 0/7] Fixing dma mask setting in various network drivers

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Date:	Tue, 11 Jun 2013 16:50:44 -0700
From:	Jesse Brandeburg <jesse.brandeburg@...el.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	"Duyck, Alexander H" <alexander.h.duyck@...el.com>,
	"Allan, Bruce W" <bruce.w.allan@...el.com>,
	"Wyborny, Carolyn" <carolyn.wyborny@...el.com>,
	"Skidmore, Donald C" <donald.c.skidmore@...el.com>,
	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>,
	"Rose, Gregory V" <gregory.v.rose@...el.com>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"Ronciak, John" <john.ronciak@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"Waskiewicz Jr, Peter P" <peter.p.waskiewicz.jr@...el.com>,
	Rasesh Mody <rmody@...cade.com>,
	"Dave, Tushar N" <tushar.n.dave@...el.com>,
	jesse.brandeburg@...el.com
Subject: Re: [RFC 0/7] Fixing dma mask setting in various network drivers

On Tue, 11 Jun 2013 13:35:05 -0700
Russell King - ARM Linux <linux@....linux.org.uk> wrote:
> As part of my review of all this stuff, I'm wondering whether a helper
> to set both masks makes sense.  Something like:
> 
> static inline int dma_set_masks(struct device *dev, u64 mask)

it doesn't need to be inline, it is never called in hotpath.

> {
> 	int ret = dma_set_mask(dev, mask);
> 	if (ret == 0)
> 		dma_set_coherent_mask(dev, mask);
> 	return ret;
> }
> 
> "dma_set_masks()" is a little too close to dma_set_mask() though; and

how about dma_set_mask_and_coherent(...)

> such a function looks like it would be usable for 20 odd drivers
> currently.  The plus point is that it may help to prevent this kind
> of issue in the future...
> 
> Thoughts?

I really like the idea of consolidating this in the kernel with a
global helper.

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