shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-07 03:15:31 +09:00
Code Issues Packages Projects Releases Wiki Activity

staging: erofs: add a full barrier in erofs_workgroup_unfreeze

Browse Source 
commit 948bbdb181 upstream.

Just like other generic locks, insert a full barrier
in case of memory reorder.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gao Xiang
2018-11-23 01:16:03 +08:00
committed by Greg Kroah-Hartman
parent 08ec9e6892
commit 60ce4b5297
1 changed files with 5 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/staging/erofs/internal.h
View File

@@ -199,6 +199,11 @@ static inline bool erofs_workgroup_try_to_freeze(struct erofs_workgroup *grp,
static inline void erofs_workgroup_unfreeze(struct erofs_workgroup *grp,
int orig_val)
{
/*
* other observers should notice all modifications
* in the freezing period.
*/
smp_mb();
atomic_set(&grp->refcount, orig_val);
preempt_enable();
}