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-rw-r--r--mm/mmap.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index 2f2415a7a688..e2e9f48b06c2 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3042,11 +3042,16 @@ static int special_mapping_fault(struct vm_area_struct *vma,
pgoff_t pgoff;
struct page **pages;
- if (vma->vm_ops == &legacy_special_mapping_vmops)
+ if (vma->vm_ops == &legacy_special_mapping_vmops) {
pages = vma->vm_private_data;
- else
- pages = ((struct vm_special_mapping *)vma->vm_private_data)->
- pages;
+ } else {
+ struct vm_special_mapping *sm = vma->vm_private_data;
+
+ if (sm->fault)
+ return sm->fault(sm, vma, vmf);
+
+ pages = sm->pages;
+ }
for (pgoff = vmf->pgoff; pgoff && *pages; ++pages)
pgoff--;