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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/block/aoe/aoedev.c
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..
@@ -5,7 +5,7 @@
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  */
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6
 
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 #include <linux/hdreg.h>
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-#include <linux/blkdev.h>
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+#include <linux/blk-mq.h>
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 #include <linux/netdevice.h>
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 #include <linux/delay.h>
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11
 #include <linux/slab.h>
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@@ -160,21 +160,22 @@
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 aoe_failip(struct aoedev *d)
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 {
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 	struct request *rq;
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+	struct aoe_req *req;
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 	struct bio *bio;
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-	unsigned long n;
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 	aoe_failbuf(d, d->ip.buf);
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-
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 	rq = d->ip.rq;
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 	if (rq == NULL)
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 		return;
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+
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+	req = blk_mq_rq_to_pdu(rq);
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 	while ((bio = d->ip.nxbio)) {
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 		bio->bi_status = BLK_STS_IOERR;
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 		d->ip.nxbio = bio->bi_next;
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-		n = (unsigned long) rq->special;
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-		rq->special = (void *) --n;
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+		req->nr_bios--;
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 	}
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-	if ((unsigned long) rq->special == 0)
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+
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+	if (!req->nr_bios)
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 		aoe_end_request(d, rq, 0);
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 }
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181
 
..
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@@ -197,7 +198,6 @@
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 {
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 	struct aoetgt *t, **tt, **te;
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 	struct list_head *head, *pos, *nx;
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-	struct request *rq;
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 	int i;
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202
 
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 	d->flags &= ~DEVFL_UP;
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@@ -225,10 +225,11 @@
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 	/* fast fail all pending I/O */
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 	if (d->blkq) {
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-		while ((rq = blk_peek_request(d->blkq))) {
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-			blk_start_request(rq);
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-			aoe_end_request(d, rq, 1);
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-		}
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+		/* UP is cleared, freeze+quiesce to insure all are errored */
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+		blk_mq_freeze_queue(d->blkq);
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+		blk_mq_quiesce_queue(d->blkq);
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+		blk_mq_unquiesce_queue(d->blkq);
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+		blk_mq_unfreeze_queue(d->blkq);
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 	}
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234
 
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 	if (d->gd)
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@@ -275,9 +276,9 @@
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 	del_timer_sync(&d->timer);
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 	if (d->gd) {
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 		aoedisk_rm_debugfs(d);
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-		aoedisk_rm_sysfs(d);
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 		del_gendisk(d->gd);
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 		put_disk(d->gd);
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+		blk_mq_free_tag_set(&d->tag_set);
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 		blk_cleanup_queue(d->blkq);
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 	}
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 	t = d->targets;
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@@ -322,10 +323,14 @@
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 	}
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324
 
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 	flush_scheduled_work();
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-	/* pass one: without sleeping, do aoedev_downdev */
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+	/* pass one: do aoedev_downdev, which might sleep */
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+restart1:
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 	spin_lock_irqsave(&devlist_lock, flags);
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 	for (d = devlist; d; d = d->next) {
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 		spin_lock(&d->lock);
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+		if (d->flags & DEVFL_TKILL)
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+			goto cont;
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+
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 		if (exiting) {
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 			/* unconditionally take each device down */
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 		} else if (specified) {
..
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@@ -337,8 +342,11 @@
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 		|| d->ref)
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 			goto cont;
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+		spin_unlock(&d->lock);
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+		spin_unlock_irqrestore(&devlist_lock, flags);
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 		aoedev_downdev(d);
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 		d->flags |= DEVFL_TKILL;
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+		goto restart1;
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 cont:
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 		spin_unlock(&d->lock);
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 	}
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@@ -347,7 +355,7 @@
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 	/* pass two: call freedev, which might sleep,
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 	 * for aoedevs marked with DEVFL_TKILL
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 	 */
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-restart:
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+restart2:
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 	spin_lock_irqsave(&devlist_lock, flags);
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 	for (d = devlist; d; d = d->next) {
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 		spin_lock(&d->lock);
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@@ -356,7 +364,7 @@
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 			spin_unlock(&d->lock);
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 			spin_unlock_irqrestore(&devlist_lock, flags);
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 			freedev(d);
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-			goto restart;
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+			goto restart2;
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 		}
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 		spin_unlock(&d->lock);
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 	}
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@@ -464,6 +472,7 @@
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 	d->ntargets = NTARGETS;
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 	INIT_WORK(&d->work, aoecmd_sleepwork);
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 	spin_lock_init(&d->lock);
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+	INIT_LIST_HEAD(&d->rq_list);
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 	skb_queue_head_init(&d->skbpool);
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 	timer_setup(&d->timer, dummy_timer, 0);
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 	d->timer.expires = jiffies + HZ;