linux-kernel - Re: [PATCH v9 12/13] swiotlb-xen: pass dev_addr to xen_dma_unmap_page and xen_dma_sync_single_for

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Date:	Wed, 19 Nov 2014 16:07:03 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc:	xen-devel@...ts.xensource.com, Ian.Campbell@...rix.com,
	david.vrabel@...rix.com, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, catalin.marinas@....com
Subject: Re: [PATCH v9 12/13] swiotlb-xen: pass dev_addr to
 xen_dma_unmap_page and xen_dma_sync_single_for_cpu

On Wed, Nov 12, 2014 at 11:40:53AM +0000, Stefano Stabellini wrote:
> xen_dma_unmap_page and xen_dma_sync_single_for_cpu take a dma_addr_t
> handle as argument, not a physical address.

Ouch. Should this also go on stable tree?

> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> Reviewed-by: Catalin Marinas <catalin.marinas@....com>
> ---
>  drivers/xen/swiotlb-xen.c |    6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
> index 3725ee4..498b654 100644
> --- a/drivers/xen/swiotlb-xen.c
> +++ b/drivers/xen/swiotlb-xen.c
> @@ -449,7 +449,7 @@ static void xen_unmap_single(struct device *hwdev, dma_addr_t dev_addr,
>  
>  	BUG_ON(dir == DMA_NONE);
>  
> -	xen_dma_unmap_page(hwdev, paddr, size, dir, attrs);
> +	xen_dma_unmap_page(hwdev, dev_addr, size, dir, attrs);
>  
>  	/* NOTE: We use dev_addr here, not paddr! */
>  	if (is_xen_swiotlb_buffer(dev_addr)) {
> @@ -497,14 +497,14 @@ xen_swiotlb_sync_single(struct device *hwdev, dma_addr_t dev_addr,
>  	BUG_ON(dir == DMA_NONE);
>  
>  	if (target == SYNC_FOR_CPU)
> -		xen_dma_sync_single_for_cpu(hwdev, paddr, size, dir);
> +		xen_dma_sync_single_for_cpu(hwdev, dev_addr, size, dir);
>  
>  	/* NOTE: We use dev_addr here, not paddr! */
>  	if (is_xen_swiotlb_buffer(dev_addr))
>  		swiotlb_tbl_sync_single(hwdev, paddr, size, dir, target);
>  
>  	if (target == SYNC_FOR_DEVICE)
> -		xen_dma_sync_single_for_cpu(hwdev, paddr, size, dir);
> +		xen_dma_sync_single_for_cpu(hwdev, dev_addr, size, dir);
>  
>  	if (dir != DMA_FROM_DEVICE)
>  		return;
> -- 
> 1.7.10.4
> 
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