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-rw-r--r--block/blk-mq-tag.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
index ed96474..7a6b6e2 100644
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -75,6 +75,10 @@ void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool include_reserve)
struct blk_mq_bitmap_tags *bt;
int i, wake_index;
+ /*
+ * Make sure all changes prior to this are visible from other CPUs.
+ */
+ smp_mb();
bt = &tags->bitmap_tags;
wake_index = atomic_read(&bt->wake_index);
for (i = 0; i < BT_WAIT_QUEUES; i++) {
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