linux-kernel - Re: [PATCH v4 05/10] arm64: do not initialize arm64_swiotlb if dma

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Message-ID: <20130819165549.GD19712@arm.com>
Date:	Mon, 19 Aug 2013 17:55:49 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc:	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	"Ian.Campbell@...rix.com" <Ian.Campbell@...rix.com>,
	Will Deacon <Will.Deacon@....com>
Subject: Re: [PATCH v4 05/10] arm64: do not initialize arm64_swiotlb if
 dma_ops is already set

On Thu, Aug 15, 2013 at 12:10:49PM +0100, Stefano Stabellini wrote:
> Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> CC: catalin.marinas@....com
> CC: will.deacon@....com
> ---
>  arch/arm64/mm/dma-mapping.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
> index 4bd7579..a006e84 100644
> --- a/arch/arm64/mm/dma-mapping.c
> +++ b/arch/arm64/mm/dma-mapping.c
> @@ -63,6 +63,8 @@ static struct dma_map_ops arm64_swiotlb_dma_ops = {
>  
>  void __init arm64_swiotlb_init(void)
>  {
> +	if (dma_ops != NULL)
> +		return;
>  	dma_ops = &arm64_swiotlb_dma_ops;
>  	swiotlb_init(1);

Acked-by: Catalin Marinas <catalin.marinas@....com>
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