mm: Use helper function put_write_access()

Commit Message

Miaohe Lin Sept. 24, 2020, 11:52 a.m. UTC

In commit 1da177e4c3f4 ("Linux-2.6.12-rc2"), the helper put_write_access()
came with the atomic_dec operation of the i_writecount field. But it forgot
to use this helper in __vma_link_file() and dup_mmap().

Signed-off-by: Miaohe Lin <[e-mail]>
---
 kernel/fork.c | 2 +-
 mm/mmap.c     | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

Patch

diff --git a/kernel/fork.c b/kernel/fork.c
index b9164b75b20c..c92bbbdcc6ad 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -555,7 +555,7 @@  static __latent_entropy int dup_mmap(struct mm_struct *mm,
 
 			get_file(file);
 			if (tmp->vm_flags & VM_DENYWRITE)
-				atomic_dec(&inode->i_writecount);
+				put_write_access(inode);
 			i_mmap_lock_write(mapping);
 			if (tmp->vm_flags & VM_SHARED)
 				mapping_allow_writable(mapping);
diff --git a/mm/mmap.c b/mm/mmap.c
index fc1bd8264407..9b211e8b267d 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -663,7 +663,7 @@  static void __vma_link_file(struct vm_area_struct *vma)
 		struct address_space *mapping = file->f_mapping;
 
 		if (vma->vm_flags & VM_DENYWRITE)
-			atomic_dec(&file_inode(file)->i_writecount);
+			put_write_access(file_inode(file));
 		if (vma->vm_flags & VM_SHARED)
 			mapping_allow_writable(mapping);