1 files changed, 10 insertions, 2 deletions

diff --git a/include/linux/dynamic_queue_limits.h b/include/linux/dynamic_queue_limits.h
index 5621547d631b..a4be70398ce1 100644
--- a/include/linux/dynamic_queue_limits.h
+++ b/include/linux/dynamic_queue_limits.h
@@ -73,14 +73,22 @@ static inline void dql_queued(struct dql *dql, unsigned int count)
 {
         BUG_ON(count > DQL_MAX_OBJECT);
 
-        dql->num_queued += count;
         dql->last_obj_cnt = count;
+
+        /* We want to force a write first, so that cpu do not attempt
+         * to get cache line containing last_obj_cnt, num_queued, adj_limit
+         * in Shared state, but directly does a Request For Ownership
+         * It is only a hint, we use barrier() only.
+         */
+        barrier();
+
+        dql->num_queued += count;
 }
 
 /* Returns how many objects can be queued, < 0 indicates over limit. */
 static inline int dql_avail(const struct dql *dql)
 {
-        return dql->adj_limit - dql->num_queued;
+        return ACCESS_ONCE(dql->adj_limit) - ACCESS_ONCE(dql->num_queued);
 }
 
 /* Record number of completed objects and recalculate the limit. */