From 6cb47ed7397e0881afede05161ccaf5b70f95414 Mon Sep 17 00:00:00 2001 From: Cho KyongHo Date: Mon, 12 May 2014 11:44:51 +0530 Subject: [PATCH] iommu/exynos: Add missing cache flush for removed page table entries 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. Reviewed-by: Tomasz Figa Tested-by: Grant Grundler Signed-off-by: Cho KyongHo Signed-off-by: Shaik Ameer Basha Signed-off-by: Joerg Roedel --- drivers/iommu/exynos-iommu.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c index 4fc31fc6a49a..6915235f9e86 100644 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -904,6 +904,7 @@ 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; } @@ -915,6 +916,7 @@ static size_t exynos_iommu_unmap(struct iommu_domain *domain, } 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; -- 2.11.0