diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c
index 7c8b1f94ea3a..aaf0c60794e2 100644
--- a/drivers/iommu/intel/dmar.c
+++ b/drivers/iommu/intel/dmar.c
@@ -1257,9 +1257,7 @@ static void free_iommu(struct intel_iommu *iommu)
  */
 static inline void reclaim_free_desc(struct q_inval *qi)
 {
-	while (qi->desc_status[qi->free_tail] == QI_DONE ||
-	       qi->desc_status[qi->free_tail] == QI_ABORT) {
-		qi->desc_status[qi->free_tail] = QI_FREE;
+	while (qi->desc_status[qi->free_tail] == QI_FREE && qi->free_tail != qi->free_head) {
 		qi->free_tail = (qi->free_tail + 1) % QI_LENGTH;
 		qi->free_cnt++;
 	}
@@ -1494,8 +1492,16 @@ int qi_submit_sync(struct intel_iommu *iommu, struct qi_desc *desc,
 		raw_spin_lock(&qi->q_lock);
 	}
 
-	for (i = 0; i < count; i++)
-		qi->desc_status[(index + i) % QI_LENGTH] = QI_DONE;
+	/*
+	 * The reclaim code can free descriptors from multiple submissions
+	 * starting from the tail of the queue. When count == 0, the
+	 * status of the standalone wait descriptor at the tail of the queue
+	 * must be set to QI_FREE to allow the reclaim code to proceed.
+	 * It is also possible that descriptors from one of the previous
+	 * submissions has to be reclaimed by a subsequent submission.
+	 */
+	for (i = 0; i <= count; i++)
+		qi->desc_status[(index + i) % QI_LENGTH] = QI_FREE;
 
 	reclaim_free_desc(qi);
 	raw_spin_unlock_irqrestore(&qi->q_lock, flags);