Commit 948bbdb1 authored Nov 23, 2018 by Gao Xiang Committed by Greg Kroah-Hartman Nov 23, 2018

staging: erofs: add a full barrier in erofs_workgroup_unfreeze



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>

parent 73f5c66d

drivers/staging/erofs/internal.h

+5 −0

Original line number	Diff line number	Diff line
		@@ -209,6 +209,11 @@ 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();
		}

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