From 52a2b53ffde6d6018dfc454fbde34383351fb896 Mon Sep 17 00:00:00 2001
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Date: Tue, 8 Sep 2015 14:59:45 -0700
Subject: [PATCH] mm, dax: use i_mmap_unlock_write() in do_cow_fault()
__dax_fault() takes i_mmap_lock for write. Let's pair it with write
unlock on do_cow_fault() side.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
mm/memory.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/mm/memory.c b/mm/memory.c
index ce8e983f3c4d..6cd0b2160401 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3013,9 +3013,9 @@ static int do_cow_fault(struct mm_struct *mm, struct vm_area_struct *vma,
} else {
/*
* The fault handler has no page to lock, so it holds
- * i_mmap_lock for read to protect against truncate.
+ * i_mmap_lock for write to protect against truncate.
*/
- i_mmap_unlock_read(vma->vm_file->f_mapping);
+ i_mmap_unlock_write(vma->vm_file->f_mapping);
}
goto uncharge_out;
}
@@ -3029,9 +3029,9 @@ static int do_cow_fault(struct mm_struct *mm, struct vm_area_struct *vma,
} else {
/*
* The fault handler has no page to lock, so it holds
- * i_mmap_lock for read to protect against truncate.
+ * i_mmap_lock for write to protect against truncate.
*/
- i_mmap_unlock_read(vma->vm_file->f_mapping);
+ i_mmap_unlock_write(vma->vm_file->f_mapping);
}
return ret;
uncharge_out:
--
2.49.0