diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index b96105481784..e888f2445692 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5644,6 +5644,7 @@ struct ata_port *ata_port_alloc(struct ata_host *host)
 	mutex_init(&ap->scsi_scan_mutex);
 	INIT_DELAYED_WORK(&ap->hotplug_task, ata_scsi_hotplug);
 	INIT_DELAYED_WORK(&ap->scsi_rescan_task, ata_scsi_dev_rescan);
+	INIT_WORK(&ap->deferred_qc_work, ata_scsi_deferred_qc_work);
 	INIT_LIST_HEAD(&ap->eh_done_q);
 	init_waitqueue_head(&ap->eh_wait_q);
 	init_completion(&ap->park_req_pending);
@@ -6256,6 +6257,10 @@ static void ata_port_detach(struct ata_port *ap)
 		}
 	}
 
+	/* Make sure the deferred qc work finished. */
+	cancel_work_sync(&ap->deferred_qc_work);
+	WARN_ON(ap->deferred_qc);
+
 	/* Tell EH to disable all devices */
 	ap->pflags |= ATA_PFLAG_UNLOADING;
 	ata_port_schedule_eh(ap);
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index f4c9541d1910..72a22b6c9682 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -918,6 +918,12 @@ static void ata_eh_set_pending(struct ata_port *ap, bool fastdrain)
 
 	ap->pflags |= ATA_PFLAG_EH_PENDING;
 
+	/*
+	 * If we have a deferred qc, requeue it so that it is retried once EH
+	 * completes.
+	 */
+	ata_scsi_requeue_deferred_qc(ap);
+
 	if (!fastdrain)
 		return;
 
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index be620bc04584..e7898bf56308 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -1658,8 +1658,77 @@ static void ata_qc_done(struct ata_queued_cmd *qc)
 	done(cmd);
 }
 
+void ata_scsi_deferred_qc_work(struct work_struct *work)
+{
+	struct ata_port *ap =
+		container_of(work, struct ata_port, deferred_qc_work);
+	struct ata_queued_cmd *qc;
+	unsigned long flags;
+
+	spin_lock_irqsave(ap->lock, flags);
+
+	/*
+	 * If we still have a deferred qc and we are not in EH, issue it. In
+	 * such case, we should not need any more deferring the qc, so warn if
+	 * qc_defer() says otherwise.
+	 */
+	qc = ap->deferred_qc;
+	if (qc && !ata_port_eh_scheduled(ap)) {
+		WARN_ON_ONCE(ap->ops->qc_defer(qc));
+		ap->deferred_qc = NULL;
+		ata_qc_issue(qc);
+	}
+
+	spin_unlock_irqrestore(ap->lock, flags);
+}
+
+void ata_scsi_requeue_deferred_qc(struct ata_port *ap)
+{
+	struct ata_queued_cmd *qc = ap->deferred_qc;
+	struct scsi_cmnd *scmd;
+
+	lockdep_assert_held(ap->lock);
+
+	/*
+	 * If we have a deferred qc when a reset occurs or NCQ commands fail,
+	 * do not try to be smart about what to do with this deferred command
+	 * and simply retry it by completing it with DID_SOFT_ERROR.
+	 */
+	if (!qc)
+		return;
+
+	scmd = qc->scsicmd;
+	ap->deferred_qc = NULL;
+	ata_qc_free(qc);
+	scmd->result = (DID_SOFT_ERROR << 16);
+	scsi_done(scmd);
+}
+
+static void ata_scsi_schedule_deferred_qc(struct ata_port *ap)
+{
+	struct ata_queued_cmd *qc = ap->deferred_qc;
+
+	lockdep_assert_held(ap->lock);
+
+	/*
+	 * If we have a deferred qc, then qc_defer() is defined and we can use
+	 * this callback to determine if this qc is good to go, unless EH has
+	 * been scheduled.
+	 */
+	if (!qc)
+		return;
+
+	if (ata_port_eh_scheduled(ap)) {
+		ata_scsi_requeue_deferred_qc(ap);
+		return;
+	}
+	if (!ap->ops->qc_defer(qc))
+		queue_work(system_highpri_wq, &ap->deferred_qc_work);
+}
+
 static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
 {
+	struct ata_port *ap = qc->ap;
 	struct scsi_cmnd *cmd = qc->scsicmd;
 	u8 *cdb = cmd->cmnd;
 	bool have_sense = qc->flags & ATA_QCFLAG_SENSE_VALID;
@@ -1689,6 +1758,8 @@ static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
 	}
 
 	ata_qc_done(qc);
+
+	ata_scsi_schedule_deferred_qc(ap);
 }
 
 static int ata_scsi_qc_issue(struct ata_port *ap, struct ata_queued_cmd *qc)
@@ -1698,6 +1769,16 @@ static int ata_scsi_qc_issue(struct ata_port *ap, struct ata_queued_cmd *qc)
 	if (!ap->ops->qc_defer)
 		goto issue;
 
+	/*
+	 * If we already have a deferred qc, then rely on the SCSI layer to
+	 * requeue and defer all incoming commands until the deferred qc is
+	 * processed, once all on-going commands complete.
+	 */
+	if (ap->deferred_qc) {
+		ata_qc_free(qc);
+		return SCSI_MLQUEUE_DEVICE_BUSY;
+	}
+
 	/* Check if the command needs to be deferred. */
 	ret = ap->ops->qc_defer(qc);
 	switch (ret) {
@@ -1716,6 +1797,18 @@ static int ata_scsi_qc_issue(struct ata_port *ap, struct ata_queued_cmd *qc)
 	}
 
 	if (ret) {
+		/*
+		 * We must defer this qc: if this is not an NCQ command, keep
+		 * this qc as a deferred one and report to the SCSI layer that
+		 * we issued it so that it is not requeued. The deferred qc will
+		 * be issued with the port deferred_qc_work once all on-going
+		 * commands complete.
+		 */
+		if (!ata_is_ncq(qc->tf.protocol)) {
+			ap->deferred_qc = qc;
+			return 0;
+		}
+
 		/* Force a requeue of the command to defer its execution. */
 		ata_qc_free(qc);
 		return ret;
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index 89dd0ae2b991..9b4e578ad07e 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -166,6 +166,8 @@ void ata_scsi_sdev_config(struct scsi_device *sdev);
 int ata_scsi_dev_config(struct scsi_device *sdev, struct queue_limits *lim,
 		struct ata_device *dev);
 int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, struct ata_device *dev);
+void ata_scsi_deferred_qc_work(struct work_struct *work);
+void ata_scsi_requeue_deferred_qc(struct ata_port *ap);
 
 /* libata-eh.c */
 extern unsigned int ata_internal_cmd_timeout(struct ata_device *dev, u8 cmd);
diff --git a/include/linux/libata.h b/include/linux/libata.h
index aa88244f3d83..d612d4c1660a 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -899,6 +899,9 @@ struct ata_port {
 	u64			qc_active;
 	int			nr_active_links; /* #links with active qcs */
 
+	struct work_struct	deferred_qc_work;
+	struct ata_queued_cmd	*deferred_qc;
+
 	struct ata_link		link;		/* host default link */
 	struct ata_link		*slave_link;	/* see ata_slave_link_init() */