[PATCH kernel 3/4] powerpc/mm/iommu: Make mm_iommu_new() fail on existing regions

[Alexey Kardashevskiy]

Since we are going to have 2 different preregistering helpers, let's
make it clear that mm_iommu_new() is only for the normal (i.e. not device)
memory and for existing areas mm_iommu_get() should be used instead.

Signed-off-by: Alexey Kardashevskiy <aik at ozlabs.ru>
---
 arch/powerpc/mm/mmu_context_iommu.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/powerpc/mm/mmu_context_iommu.c b/arch/powerpc/mm/mmu_context_iommu.c
index a8c4a3c..839dbce 100644
--- a/arch/powerpc/mm/mmu_context_iommu.c
+++ b/arch/powerpc/mm/mmu_context_iommu.c
@@ -141,8 +141,7 @@ long mm_iommu_new(struct mm_struct *mm, unsigned long ua, unsigned long entries,
 	list_for_each_entry_rcu(mem, &mm->context.iommu_group_mem_list,
 			next) {
 		if ((mem->ua == ua) && (mem->entries == entries)) {
-			++mem->used;
-			*pmem = mem;
+			ret = -EBUSY;
 			goto unlock_exit;
 		}
 
-- 
2.11.0