linux-kernel - Re: [PATCH] iommu: fix trace_unmap() to report original iova

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Message-ID: <20150119140400.GN6343@8bytes.org>
Date:	Mon, 19 Jan 2015 15:04:01 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Shuah Khan <shuahkh@....samsung.com>
Cc:	alex.williamson@...hat.com, iommu@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu: fix trace_unmap() to report original iova

On Fri, Jan 16, 2015 at 04:47:19PM -0700, Shuah Khan wrote:
> iommu_unmap() calls trace_unmap() with changed iova and original
> size. trace_unmap() should report original iova instead. Change
> iommu_unmap() to call trace_unmap() with original iova.
> 
> Signed-off-by: Shuah Khan <shuahkh@....samsung.com>
> Reported-by: Alex Williamson <alex.williamson@...hat.com>
> ---
>  drivers/iommu/iommu.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index fbf8827..2eb7554 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -1094,6 +1094,7 @@ size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size)
>  {
>  	size_t unmapped_page, unmapped = 0;
>  	unsigned int min_pagesz;
> +	unsigned long orig_iova = iova;

Instead of adding another variable I think it is better to just move the
trace_unmap call before the unmap loop. It can actually replace the
pr_debug there.


	Joerg

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