linux-kernel - Re: [PATCH v2] fsl-dma: allow Freescale Elo DMA driver to be compiled as a module

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Message-ID: <2a27d3730809242354u4cc24b96yda3973bfc3ddac92@mail.gmail.com>
Date:	Thu, 25 Sep 2008 14:54:54 +0800
From:	"Li Yang" <leoli@...escale.com>
To:	"Timur Tabi" <timur@...escale.com>
Cc:	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
	dan.j.williams@...el.com
Subject: Re: [PATCH v2] fsl-dma: allow Freescale Elo DMA driver to be compiled as a module

On Thu, Sep 25, 2008 at 5:59 AM, Timur Tabi <timur@...escale.com> 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().  Instead, the DMA channels are manually probed,
> similar to what fsl_elbc_nand.c does.
>
> Signed-off-by: Timur Tabi <timur@...escale.com>
> ---
>
> v2: updated per comments
>
> 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.
[snip]
> +static void __exit of_fsl_dma_exit(void)
> +{
> +       of_unregister_platform_driver(&of_fsl_dma_driver);
>  }
>
> -subsys_initcall(of_fsl_dma_chan_init);
>  subsys_initcall(of_fsl_dma_init);

Not a critical problem.  But module_init() are preferred for modules.

> +module_exit(of_fsl_dma_exit);
> +
> +MODULE_DESCRIPTION("Freescale Elo / Elo Plus DMA driver");
> +MODULE_LICENSE("GPL");

Acked-by: Li Yang <leoli@...escale.com>

- Leo
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