linux-kernel - Re: [PATCH] dw_dmac: apply default dma

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Message-ID: <20130212161604.GO3789@intel.com>
Date:	Tue, 12 Feb 2013 08:16:04 -0800
From:	Vinod Koul <vinod.koul@...el.com>
To:	Andy Shevchenko <andriy.shevchenko@...ux.jf.intel.com>
Cc:	linux-kernel@...r.kernel.org,
	spear-devel <spear-devel@...t.st.com>,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: Re: [PATCH] dw_dmac: apply default dma_mask if needed

On Tue, Jan 29, 2013 at 05:06:24PM +0200, Andy Shevchenko wrote:
> In some cases we got the device without dma_mask configured. We have to apply
> the default value to avoid crashes during memory mapping.
> 
what was this generated against, it fails to apply for me.

> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/dma/dw_dmac.c |    6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
> index e8d0679..a572a1e 100644
> --- a/drivers/dma/dw_dmac.c
> +++ b/drivers/dma/dw_dmac.c
> @@ -1673,6 +1673,12 @@ static int dw_probe(struct platform_device *pdev)
>  	if (IS_ERR(regs))
>  		return PTR_ERR(regs);
>  
> +	/* Apply default dma_mask if needed */
> +	if (!pdev->dev.dma_mask) {
> +		pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
> +		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
> +	}
> +
>  	dw_params = dma_read_byaddr(regs, DW_PARAMS);
>  	autocfg = dw_params >> DW_PARAMS_EN & 0x1;
>  
> -- 
> 1.7.10.4
> 
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