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:	Thu, 20 Nov 2014 10:33:55 +0000
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	<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, 19 Nov 2014, Konrad Rzeszutek Wilk wrote:
> 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?

Good idea


> > 
> > 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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