linux-kernel - Re: [PATCH v1 3/4] dma: dw: split driver to library part and platform code

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Message-ID: <4155522.4XZWB6Jmjq@wuerfel>
Date:	Tue, 04 Jun 2013 15:00:43 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	Vinod Koul <vinod.koul@...el.com>, linux-kernel@...r.kernel.org,
	spear-devel <spear-devel@...t.st.com>, viresh.kumar@...aro.org,
	Felipe Balbi <balbi@...com>
Subject: Re: [PATCH v1 3/4] dma: dw: split driver to library part and platform code

On Tuesday 04 June 2013 15:36:21 Andy Shevchenko wrote:
> To simplify the driver development let's split driver to library and platform
> code parts. It helps us to add PCI driver in future.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/dma/Makefile                      |   2 +-
>  drivers/dma/dw/Kconfig                    |   8 +-
>  drivers/dma/dw/Makefile                   |   6 +-
>  drivers/dma/dw/{dw_dmac.c => core.c}      | 309 ++++--------------------------
>  drivers/dma/dw/internal.h                 |  74 +++++++
>  drivers/dma/dw/platform.c                 | 308 +++++++++++++++++++++++++++++
>  drivers/dma/dw/{dw_dmac_regs.h => regs.h} |   1 +

Looks good to me, just one issue I found:

> +#ifdef CONFIG_PM_SLEEP
> +
> +int dw_dma_suspend_noirq(struct dw_dma_chip *chip);
> +int dw_dma_resume_noirq(struct dw_dma_chip *chip);
> +
> +#else /* !CONFIG_PM_SLEEP */
> +
> +#define dw_dma_suspend_noirq	NULL
> +#define dw_dma_resume_noirq	NULL
> +
> +#endif /* !CONFIG_PM_SLEEP */

This won't work ...

> +static int dw_suspend_noirq(struct device *dev)
> +{
> +	struct platform_device *pdev = to_platform_device(dev);
> +	struct dw_dma_chip *chip = platform_get_drvdata(pdev);
> +
> +	return dw_dma_suspend_noirq(chip);
> +}
> +
> +static int dw_resume_noirq(struct device *dev)
> +{
> +	struct platform_device *pdev = to_platform_device(dev);
> +	struct dw_dma_chip *chip = platform_get_drvdata(pdev);
> +
> +	return dw_dma_resume_noirq(chip);
> +}

when you try to call NULL as a function.

Please try to get it to build with CONFIG_PM_SLEEP disabled.

	Arnd
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