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From: Ian Campbell <Ian.Campbell@citrix.com>
To: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: <xen-devel@lists.xensource.com>, <linux-kernel@vger.kernel.org>,
	<david.vrabel@citrix.com>, <stable@vger.kernel.org>,
	Luis Henriques <luis.henriques@canonical.com>
Subject: Re: [Xen-devel] [PATCH 2/2] swiotlb-xen: pass dev_addr to swiotlb_tbl_unmap_single
Date: Mon, 26 Jan 2015 10:53:27 +0000	[thread overview]
Message-ID: <1422269607.27469.5.camel@citrix.com> (raw)
In-Reply-To: <1416589220-7720-2-git-send-email-stefano.stabellini@eu.citrix.com>

On Fri, 2014-11-21 at 17:00 +0000, Stefano Stabellini wrote:
> Need to pass the pointer within the swiotlb internal buffer to the
> swiotlb library, that in the case of xen_unmap_single is dev_addr, not
> paddr.
> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
> CC: konrad.wilk@oracle.com
> CC: stable@vger.kernel.org

This went into mainline as 2c3fc8d26dd0 "swiotlb-xen: pass dev_addr to
swiotlb_tbl_unmap_single" but was reverted in dbdd74763f1f.

However it seems that 2c3fc8d26dd0 has made it into at least some stable
kernel trees:
        v3.18.3 as 2129c43d41e9
        v3.16.7-ckt4 as 94ab279b0c9a
        v3.14.29 as 3394691d34fc
        v3.10.65 as 81cb80b578c5
so it should be reverted there too. This is causing issues in the field
such as https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=776237.

v3.17, v3.15, v3.13.11-ckt14, v3.12.x, v3.11.x appear clean, I stopped
going backwards at v3.10.

Cheers,
Ian.

> ---
>  drivers/xen/swiotlb-xen.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
> index 810ad41..5ea1e3c 100644
> --- a/drivers/xen/swiotlb-xen.c
> +++ b/drivers/xen/swiotlb-xen.c
> @@ -451,7 +451,7 @@ static void xen_unmap_single(struct device *hwdev, dma_addr_t dev_addr,
>  
>  	/* NOTE: We use dev_addr here, not paddr! */
>  	if (is_xen_swiotlb_buffer(dev_addr)) {
> -		swiotlb_tbl_unmap_single(hwdev, paddr, size, dir);
> +		swiotlb_tbl_unmap_single(hwdev, dev_addr, size, dir);
>  		return;
>  	}
>  



  reply	other threads:[~2015-01-26 10:53 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-11-21 17:00 [PATCH 0/2] small swiotlb-xen fixes Stefano Stabellini
2014-11-21 17:00 ` [PATCH 1/2] swiotlb-xen: call xen_dma_sync_single_for_device when appropriate Stefano Stabellini
2014-11-21 17:00 ` [PATCH 2/2] swiotlb-xen: pass dev_addr to swiotlb_tbl_unmap_single Stefano Stabellini
2015-01-26 10:53   ` Ian Campbell [this message]
2015-01-26 11:10     ` [Xen-devel] " Luis Henriques
2015-01-26 13:39     ` Jiri Slaby
2014-11-21 17:26 ` [PATCH 0/2] small swiotlb-xen fixes Konrad Rzeszutek Wilk
2014-11-24 11:57   ` Stefano Stabellini

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