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path: root/drivers/infiniband/core/umem_odp.c
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Diffstat (limited to 'drivers/infiniband/core/umem_odp.c')
-rw-r--r--drivers/infiniband/core/umem_odp.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/infiniband/core/umem_odp.c b/drivers/infiniband/core/umem_odp.c
index 0780b1afefa9..8c4ec564e495 100644
--- a/drivers/infiniband/core/umem_odp.c
+++ b/drivers/infiniband/core/umem_odp.c
@@ -321,11 +321,15 @@ int ib_umem_odp_get(struct ib_ucontext *context, struct ib_umem *umem,
struct vm_area_struct *vma;
struct hstate *h;
+ down_read(&mm->mmap_sem);
vma = find_vma(mm, ib_umem_start(umem));
- if (!vma || !is_vm_hugetlb_page(vma))
+ if (!vma || !is_vm_hugetlb_page(vma)) {
+ up_read(&mm->mmap_sem);
return -EINVAL;
+ }
h = hstate_vma(vma);
umem->page_shift = huge_page_shift(h);
+ up_read(&mm->mmap_sem);
umem->hugetlb = 1;
} else {
umem->hugetlb = 0;