A semaphore is acquired before this check, so we must release it before
leaving.
Fixes: b7f0554a56f2 ("mm: fail get_vaddr_frames() for filesystem-dax mappings")
Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
---
-- Untested --
The wording of the commit entry and log description could be improved
but I didn't find something better.
---
mm/frame_vector.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/mm/frame_vector.c b/mm/frame_vector.c
index 297c7238f7d4..e0c5e659fa82 100644
--- 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))
+ if (vma_is_fsdax(vma)) {
+ up_read(&mm->mmap_sem);
return -EOPNOTSUPP;
+ }
if (!(vma->vm_flags & (VM_IO | VM_PFNMAP))) {
vec->got_ref = true;
--
2.14.1
--
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