linux-kernel - Re: [PATCH 0/3] Add API for weak DMA masks

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Message-ID: <20080501020055.4ebb6393@infradead.org>
Date:	Thu, 1 May 2008 02:00:55 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Michael Buesch <mb@...sch.de>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	John Linville <linville@...driver.com>,
	Andi Kleen <andi@...stfloor.org>,
	David Miller <davem@...emloft.net>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ingo Molnar <mingo@...e.hu>, bcm43xx-dev@...ts.berlios.de,
	linux-wireless@...r.kernel.org,
	"linux-kernel" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] Add API for weak DMA masks

On Thu, 1 May 2008 16:38:15 +0200
Michael Buesch <mb@...sch.de> wrote:

> This patchset adds API and one user for a "weak" dma_set_mask().
> Weak means that it will fallback to smaller masks in case the
> DMA subsystem rejects a big mask.
> Currently such rejection may happen if the driver requests a 64bit
> mask on a VIA machine, for example. dma_set_mask_weak() will fallback
> to 32bit, in that case, and tell the caller about it by modifying the
> passed mask.

can we just make the existing API do this instead?
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