From 44e2aa937e698ea95dd86b2a4fabd734ef2c76db Mon Sep 17 00:00:00 2001 From: Dean Nelson Date: Tue, 26 Oct 2010 14:22:08 -0700 Subject: mm/hugetlb.c: add missing spin_lock() to hugetlb_cow() Add missing spin_lock() of the page_table_lock before an error return in hugetlb_cow(). Callers of hugtelb_cow() expect it to be held upon return. Signed-off-by: Dean Nelson Cc: Mel Gorman Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/hugetlb.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'mm') diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 96991ded82fe..c4a3558589ab 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -2448,8 +2448,11 @@ retry_avoidcopy: * When the original hugepage is shared one, it does not have * anon_vma prepared. */ - if (unlikely(anon_vma_prepare(vma))) + if (unlikely(anon_vma_prepare(vma))) { + /* Caller expects lock to be held */ + spin_lock(&mm->page_table_lock); return VM_FAULT_OOM; + } copy_user_huge_page(new_page, old_page, address, vma); __SetPageUptodate(new_page); -- cgit v1.2.3