linux-kernel - Re: [PATCH 5/7] iommu/msm: ->unmap() should return order of unmapped page

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Date:	Fri, 2 Sep 2011 11:36:34 -0700
From:	David Brown <davidb@...eaurora.org>
To:	Ohad Ben-Cohen <ohad@...ery.com>
Cc:	iommu@...ts.linux-foundation.org, linux-omap@...r.kernel.org,
	Hiroshi DOYU <Hiroshi.DOYU@...ia.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Joerg Roedel <Joerg.Roedel@....com>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-arm-kernel@...ts.infradead.org,
	David Brown <davidb@...eaurora.org>,
	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
	Stepan Moskovchenko <stepanm@...eaurora.org>
Subject: Re: [PATCH 5/7] iommu/msm: ->unmap() should return order of unmapped
 page

On Fri, Sep 02, 2011 at 08:32:34PM +0300, Ohad Ben-Cohen wrote:
> Users of the IOMMU API (kvm specifically) assume that iommu_unmap()
> returns the order of the unmapped page (on success).
> 
> Fix msm_iommu_unmap() accordingly.
> 
> Signed-off-by: Ohad Ben-Cohen <ohad@...ery.com>
> Cc: Stepan Moskovchenko <stepanm@...eaurora.org>
> Cc: David Brown <davidb@...eaurora.org>
> ---
>  drivers/iommu/msm_iommu.c |    7 +++++++
>  1 files changed, 7 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/iommu/msm_iommu.c b/drivers/iommu/msm_iommu.c
> index 1a584e0..d1733f6 100644
> --- a/drivers/iommu/msm_iommu.c
> +++ b/drivers/iommu/msm_iommu.c
> @@ -543,6 +543,13 @@ static int msm_iommu_unmap(struct iommu_domain *domain, unsigned long va,
>  	}
>  
>  	ret = __flush_iotlb(domain);
> +
> +	/*
> +	 * the IOMMU API requires us to return the order of the unmapped
> +	 * page (on success).
> +	 */
> +	if (!ret)
> +		ret = order;
>  fail:
>  	spin_unlock_irqrestore(&msm_iommu_lock, flags);
>  	return ret;

Acked-by: David Brown <davidb@...eaurora.org>

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