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Commit 60ce4b52 authored by Gao Xiang's avatar Gao Xiang Committed by Greg Kroah-Hartman
Browse files

staging: erofs: add a full barrier in erofs_workgroup_unfreeze 



commit 948bbdb1818b7ad6e539dad4fbd2dd4650793ea9 upstream.

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

Reviewed-by: default avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: default avatarGao Xiang <gaoxiang25@huawei.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 08ec9e68

drivers/staging/erofs/internal.h

+5 −0
Original line number Diff line number Diff line
@@ -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();

}