linux-kernel - Re: [resend][PATCH 01/16] dw_dmac: call .probe after we have a device in place

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Message-ID: <20130109134757.GN19691@intel.com>
Date:	Wed, 9 Jan 2013 05:47:57 -0800
From:	Vinod Koul <vinod.koul@...el.com>
To:	Andy Shevchenko <andriy.shevchenko@...ux.jf.intel.com>
Cc:	linux-kernel@...r.kernel.org,
	Viresh Kumar <viresh.kumar@...aro.org>,
	spear-devel <spear-devel@...t.st.com>
Subject: Re: [resend][PATCH 01/16] dw_dmac: call .probe after we have a
 device in place

On Wed, Jan 09, 2013 at 10:17:00AM +0200, Andy Shevchenko wrote:
> If we don't yet have the platform device for the driver when it is being loaded
> we fail to probe the driver. So instead of calling probe() directly we call
> platform_driver_register(). It will call the probe() immediately if we have the
> device but also makes the driver to work on platforms where the platform device
> is created later.
Why wont you have the platform device? Is this only due to your approach of
creating the device in PCI probe?
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
>  drivers/dma/dw_dmac.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
> index 476e9c8..b5f21ba 100644
> --- a/drivers/dma/dw_dmac.c
> +++ b/drivers/dma/dw_dmac.c
> @@ -1829,6 +1829,7 @@ MODULE_DEVICE_TABLE(of, dw_dma_id_table);
>  #endif
>  
>  static struct platform_driver dw_driver = {
> +	.probe		= dw_probe,
>  	.remove		= dw_remove,
>  	.shutdown	= dw_shutdown,
>  	.driver = {
> @@ -1840,7 +1841,7 @@ static struct platform_driver dw_driver = {
>  
>  static int __init dw_init(void)
>  {
> -	return platform_driver_probe(&dw_driver, dw_probe);
> +	return platform_driver_register(&dw_driver);
>  }
>  subsys_initcall(dw_init);
>  
> -- 
> 1.7.10.4
> 
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