fs/dax.c: release PMD lock even when there is no PMD support in DAX

follow_pte_pmd() can theoretically return after having acquired a PMD
lock, even when DAX was not compiled with CONFIG_FS_DAX_PMD.

Release the PMD lock unconditionally.

Link: http://lkml.kernel.org/r/20180118133839.20587-1-jschoenh@amazon.de
Fixes: f729c8c9b24f ("dax: wrprotect pmd_t in dax_mapping_entry_mkclean")
Signed-off-by: Jan H. Schönherr <jschoenh@amazon.de>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Matthew Wilcox <mawilcox@microsoft.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/dax.c b/fs/dax.c
index 95981591977a04d08f300c0795fcd96a4211adc1..c2ebf10b70daf706fcf80a1ad2cab3468fe75170 100644 (file)
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -636,8 +636,8 @@ static void dax_mapping_entry_mkclean(struct address_space *mapping,
                        pmd = pmd_mkclean(pmd);
                        set_pmd_at(vma->vm_mm, address, pmdp, pmd);
 unlock_pmd:
-                       spin_unlock(ptl);
 #endif
+                       spin_unlock(ptl);
                } else {
                        if (pfn != pte_pfn(*ptep))
                                goto unlock_pte;