1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/char/mspec.c b/drivers/char/mspec.c
index 82f2e27dca7d..ff146c2b08fd 100644
--- a/drivers/char/mspec.c
+++ b/drivers/char/mspec.c
@@ -283,7 +283,7 @@ mspec_mmap(struct file *file, struct vm_area_struct *vma,
         vdata->refcnt = ATOMIC_INIT(1);
         vma->vm_private_data = vdata;
 
-        vma->vm_flags |= (VM_IO | VM_RESERVED | VM_PFNMAP);
+        vma->vm_flags |= (VM_IO | VM_RESERVED | VM_PFNMAP | VM_DONTEXPAND);
         if (vdata->type == MSPEC_FETCHOP || vdata->type == MSPEC_UNCACHED)
                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
         vma->vm_ops = &mspec_vm_ops;