linux-kernel - Re: [PATCH] fsl-dma: allow Freescale Elo DMA driver to be compiled as a module

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Date:	Wed, 24 Sep 2008 13:30:27 -0500
From:	Kumar Gala <galak@...nel.crashing.org>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Li Yang <leoli@...escale.com>, Timur Tabi <timur@...escale.com>,
	zw@...kernel.org, linuxppc-dev list <linuxppc-dev@...abs.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fsl-dma: allow Freescale Elo DMA driver to be compiled as a module


On Sep 19, 2008, at 10:11 AM, Timur Tabi wrote:

> Modify the Freescale Elo / Elo Plus DMA driver so that it can be  
> compiled as
> a module.
>
> The primary change is to stop treating the DMA controller as a bus,  
> and the
> DMA channels as devices on the bus.  This is because the Open  
> Firmware (OF)
> kernel code does not allow busses to be removed, so although we can  
> call
> of_platform_bus_probe() to probe the DMA channels, there is no
> of_platform_bus_remove().  Therefore, the DMA channels must be  
> manually probed.
>
> Signed-off-by: Timur Tabi <timur@...escale.com>
> ---
>
> (Reposting because I forgot to CC: the maintainers)
>
> This patch is for the 2.6.28 kernel.  This patch exposes a bug in  
> the dmatest
> module, so my other patch "dmatest: properly handle duplicate DMA  
> channels"
> should be applied if this patch is applied.
>
> drivers/dma/Kconfig  |   10 ++--
> drivers/dma/fsldma.c |  165 +++++++++++++++++++++++++++++++++ 
> +----------------
> drivers/dma/fsldma.h |    2 +
> 3 files changed, 119 insertions(+), 58 deletions(-)

Dan, any update on this patch?

- k
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