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| author | Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> | 2010-07-02 14:47:20 +0900 |
|---|---|---|
| committer | Andi Kleen <ak@linux.intel.com> | 2010-08-11 09:23:48 +0200 |
| commit | 28957a5467bab9ed51a237d21e31055fad987887 (patch) | |
| tree | 1bc0a2bee4744516fb9874e36bbd7eb6cd9020b3 | |
| parent | e3390f67a7267daa227380b6f1bbf13c7ddd4aff (diff) | |
| download | linux-3.10-28957a5467bab9ed51a237d21e31055fad987887.tar.gz linux-3.10-28957a5467bab9ed51a237d21e31055fad987887.tar.bz2 linux-3.10-28957a5467bab9ed51a237d21e31055fad987887.zip | |
hugetlb: add missing unlock in avoidcopy path in hugetlb_cow()
This patch fixes possible deadlock in hugepage lock_page()
by adding missing unlock_page().
libhugetlbfs test will hit this bug when the next patch in this
patchset ("hugetlb, HWPOISON: move PG_HWPoison bit check") is applied.
Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Acked-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
| -rw-r--r-- | mm/hugetlb.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 3c275ffd32a..303fb0c0236 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -2324,9 +2324,11 @@ retry_avoidcopy: * and just make the page writable */ avoidcopy = (page_mapcount(old_page) == 1); if (avoidcopy) { - if (!trylock_page(old_page)) + if (!trylock_page(old_page)) { if (PageAnon(old_page)) page_move_anon_rmap(old_page, vma, address); + } else + unlock_page(old_page); set_huge_ptep_writable(vma, address, ptep); return 0; } |