1 files changed, 7 insertions, 4 deletions

diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 41c9e81ba74a..aeb9e20f5978 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -2676,10 +2676,13 @@ static int thin_endio(struct dm_target *ti,
         if (h->all_io_entry) {
                 INIT_LIST_HEAD(&work);
                 dm_deferred_entry_dec(h->all_io_entry, &work);
-                spin_lock_irqsave(&pool->lock, flags);
-                list_for_each_entry_safe(m, tmp, &work, list)
-                        list_add(&m->list, &pool->prepared_discards);
-                spin_unlock_irqrestore(&pool->lock, flags);
+                if (!list_empty(&work)) {
+                        spin_lock_irqsave(&pool->lock, flags);
+                        list_for_each_entry_safe(m, tmp, &work, list)
+                                list_add(&m->list, &pool->prepared_discards);
+                        spin_unlock_irqrestore(&pool->lock, flags);
+                        wake_worker(pool);
+                }
         }
 
         mempool_free(h, pool->endio_hook_pool);