linux-kernel - Re: [PATCH] libata-sff: Don't call bmdma

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Message-Id: <1169742375.3593.110.camel@shinybook.infradead.org>
Date:	Fri, 26 Jan 2007 00:26:15 +0800
From:	David Woodhouse <dwmw2@...radead.org>
To:	Russell King <rmk+lkml@....linux.org.uk>
Cc:	Jeff Garzik <jgarzik@...ox.com>, Alan <alan@...rguk.ukuu.org.uk>,
	torvalds@...l.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] libata-sff: Don't call bmdma_stop on non DMA capable
	controllers

On Thu, 2007-01-25 at 16:22 +0000, Russell King wrote:
> The zero DMA address is absolutely and totally valid.  It might not
> correspond with physical address zero on platforms.
> 
> Also, DMA address zero is not the same as NULL. 

This isn't actually "DMA address" in that context -- it's the I/O port
number at which the controller's BM-DMA control registers reside. But
still it can be zero.

-- 
dwmw2

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