--- zzzz-none-000/linux-3.10.107/block/blk-exec.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/block/blk-exec.c	2021-02-04 17:41:59.000000000 +0000
@@ -5,6 +5,7 @@
 #include <linux/module.h>
 #include <linux/bio.h>
 #include <linux/blkdev.h>
+#include <linux/blk-mq.h>
 #include <linux/sched/sysctl.h>
 
 #include "blk.h"
@@ -24,7 +25,6 @@
 	struct completion *waiting = rq->end_io_data;
 
 	rq->end_io_data = NULL;
-	__blk_put_request(rq->q, rq);
 
 	/*
 	 * complete last, if this is a stack request the process (and thus
@@ -53,33 +53,34 @@
 			   rq_end_io_fn *done)
 {
 	int where = at_head ? ELEVATOR_INSERT_FRONT : ELEVATOR_INSERT_BACK;
-	bool is_pm_resume;
 
 	WARN_ON(irqs_disabled());
+	WARN_ON(rq->cmd_type == REQ_TYPE_FS);
 
 	rq->rq_disk = bd_disk;
 	rq->end_io = done;
+
 	/*
-	 * need to check this before __blk_run_queue(), because rq can
-	 * be freed before that returns.
+	 * don't check dying flag for MQ because the request won't
+	 * be resued after dying flag is set
 	 */
-	is_pm_resume = rq->cmd_type == REQ_TYPE_PM_RESUME;
+	if (q->mq_ops) {
+		blk_mq_insert_request(rq, at_head, true, false);
+		return;
+	}
 
 	spin_lock_irq(q->queue_lock);
 
 	if (unlikely(blk_queue_dying(q))) {
+		rq->cmd_flags |= REQ_QUIET; 
 		rq->errors = -ENXIO;
-		if (rq->end_io)
-			rq->end_io(rq, rq->errors);
+		__blk_end_request_all(rq, rq->errors);
 		spin_unlock_irq(q->queue_lock);
 		return;
 	}
 
 	__elv_add_request(q, rq, where);
 	__blk_run_queue(q);
-	/* the queue is stopped so it won't be run */
-	if (is_pm_resume)
-		__blk_run_queue_uncond(q);
 	spin_unlock_irq(q->queue_lock);
 }
 EXPORT_SYMBOL_GPL(blk_execute_rq_nowait);
@@ -103,12 +104,6 @@
 	int err = 0;
 	unsigned long hang_check;
 
-	/*
-	 * we need an extra reference to the request, so we can look at
-	 * it after io completion
-	 */
-	rq->ref_count++;
-
 	if (!rq->sense) {
 		memset(sense, 0, sizeof(sense));
 		rq->sense = sense;
@@ -128,6 +123,11 @@
 	if (rq->errors)
 		err = -EIO;
 
+	if (rq->sense == sense)	{
+		rq->sense = NULL;
+		rq->sense_len = 0;
+	}
+
 	return err;
 }
 EXPORT_SYMBOL(blk_execute_rq);