On Thursday 08 of August 2013 18:37:34 Cho KyongHo wrote:
> This commit adds cache flush for removed small and large page entries
> in exynos_iommu_unmap(). Missing cache flush of removed page table
> entries can cause missing page fault interrupt when a master IP
> accesses an unmapped area.
> 
> Tested-by: Grant Grundler <grund...@chromium.org>
> Signed-off-by: Cho KyongHo <pullip....@samsung.com>
> ---
>  drivers/iommu/exynos-iommu.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
> index 233f382..d545a25 100644
> --- a/drivers/iommu/exynos-iommu.c
> +++ b/drivers/iommu/exynos-iommu.c
> @@ -1002,6 +1002,7 @@ static size_t exynos_iommu_unmap(struct
> iommu_domain *domain, if (lv2ent_small(ent)) {
>               *ent = 0;
>               size = SPAGE_SIZE;
> +             pgtable_flush(ent, ent + 1);
>               priv->lv2entcnt[lv1ent_offset(iova)] += 1;
>               goto done;
>       }
> @@ -1010,6 +1011,7 @@ static size_t exynos_iommu_unmap(struct
> iommu_domain *domain, BUG_ON(size < LPAGE_SIZE);
> 
>       memset(ent, 0, sizeof(*ent) * SPAGES_PER_LPAGE);
> +     pgtable_flush(ent, ent + SPAGES_PER_LPAGE);
> 
>       size = LPAGE_SIZE;
>       priv->lv2entcnt[lv1ent_offset(iova)] += SPAGES_PER_LPAGE;

Looks reasonable.

Reviewed-by: Tomasz Figa <t.f...@samsung.com>

Best regards,
Tomasz

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