From: David Woodhouse <dwmw2@infradead.org>
To: Russell King <rmk+lkml@arm.linux.org.uk>
Cc: Jeff Garzik <jgarzik@pobox.com>, Alan <alan@lxorguk.ukuu.org.uk>,
torvalds@osdl.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] libata-sff: Don't call bmdma_stop on non DMA capable controllers
Date: Fri, 26 Jan 2007 00:26:15 +0800 [thread overview]
Message-ID: <1169742375.3593.110.camel@shinybook.infradead.org> (raw)
In-Reply-To: <20070125162255.GF31145@flint.arm.linux.org.uk>
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
next prev parent reply other threads:[~2007-01-25 16:26 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-25 15:09 [PATCH] libata-sff: Don't call bmdma_stop on non DMA capable controllers Alan
2007-01-25 16:14 ` David Woodhouse
2007-01-25 16:17 ` Jeff Garzik
2007-01-25 16:19 ` David Woodhouse
2007-01-25 16:22 ` Russell King
2007-01-25 16:26 ` David Woodhouse [this message]
2007-01-25 17:27 ` Alan
2007-01-25 17:56 ` Linus Torvalds
2007-01-26 0:23 ` David Woodhouse
2007-01-26 1:28 ` Linus Torvalds
2007-01-26 1:45 ` Jeff Garzik
2007-01-26 2:01 ` Linus Torvalds
2007-01-26 2:11 ` Jeff Garzik
2007-01-26 10:37 ` Alan
2007-01-28 23:01 ` Benjamin Herrenschmidt
2007-01-28 22:57 ` Benjamin Herrenschmidt
2007-01-26 2:23 ` David Woodhouse
2007-01-26 2:58 ` Linus Torvalds
2007-01-26 3:28 ` David Woodhouse
2007-01-26 4:00 ` Linus Torvalds
2007-01-26 4:19 ` David Woodhouse
2007-01-26 4:48 ` Linus Torvalds
2007-01-26 5:09 ` David Woodhouse
2007-01-26 6:01 ` Linus Torvalds
2007-01-26 6:18 ` Linus Torvalds
2007-01-26 8:17 ` David Miller
2007-01-26 8:20 ` David Miller
2007-01-26 4:53 ` Jeff Garzik
2007-01-26 15:32 ` Mark Lord
2007-01-26 15:29 ` Mark Lord
2007-01-28 23:04 ` Benjamin Herrenschmidt
2007-01-28 22:49 ` Benjamin Herrenschmidt
2007-01-25 23:36 ` Jeff Garzik
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