mm/frame_vector.c: release a semaphore in 'get_vaddr_frames()'

A semaphore is acquired before this check, so we must release it before leaving. Link: http://lkml.kernel.org/r/[email protected] Fixes: b7f0554 ("mm: fail get_vaddr_frames() for filesystem-dax mappings") Signed-off-by: Christophe JAILLET <[email protected]> Acked-by: Michal Hocko <[email protected]> Cc: Dan Williams <[email protected]> Cc: Christian Borntraeger <[email protected]> Cc: David Sterba <[email protected]> Cc: Greg Kroah-Hartman <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
heikomat · Dec 15, 2017 · 1f704fd · 1f704fd
1 parent 0b265c3
commit 1f704fd
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/mm/frame_vector.c b/mm/frame_vector.c
@@ -62,8 +62,10 @@ int get_vaddr_frames(unsigned long start, unsigned int nr_frames,
 	 * get_user_pages_longterm() and disallow it for filesystem-dax
 	 * mappings.
 	 */
-	if (vma_is_fsdax(vma))
-		return -EOPNOTSUPP;
+	if (vma_is_fsdax(vma)) {
+		ret = -EOPNOTSUPP;
+		goto out;
+	}
 
 	if (!(vma->vm_flags & (VM_IO | VM_PFNMAP))) {
 		vec->got_ref = true;