[PATCH 4.10 086/111] iommu/exynos: Block SYSMMU while invalidating FLPD cache

[Greg Kroah-Hartman]

4.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Marek Szyprowski <m.szyprow...@samsung.com>

commit 7d2aa6b814476a2e2794960f844344519246df72 upstream.

Documentation specifies that SYSMMU should be in blocked state while
performing TLB/FLPD cache invalidation, so add needed calls to
sysmmu_block/unblock.

Fixes: 66a7ed84b345d ("iommu/exynos: Apply workaround of caching fault page 
table entries")
Signed-off-by: Marek Szyprowski <m.szyprow...@samsung.com>
Signed-off-by: Joerg Roedel <jroe...@suse.de>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/iommu/exynos-iommu.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -509,7 +509,10 @@ static void sysmmu_tlb_invalidate_flpdca
        spin_lock_irqsave(&data->lock, flags);
        if (data->active && data->version >= MAKE_MMU_VER(3, 3)) {
                clk_enable(data->clk_master);
-               __sysmmu_tlb_invalidate_entry(data, iova, 1);
+               if (sysmmu_block(data)) {
+                       __sysmmu_tlb_invalidate_entry(data, iova, 1);
+                       sysmmu_unblock(data);
+               }
                clk_disable(data->clk_master);
        }
        spin_unlock_irqrestore(&data->lock, flags);