null_blk: initialize the tag_set timeout in null_init_tag_set

Otherwise it will be reset to the always same value when initializing a
device using the shared tag_set.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Tested-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20240220093248.3290292-3-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/null_blk/main.c

@@ -1797,6 +1797,7 @@ static int null_init_tag_set(struct nullb *nullb, struct blk_mq_tag_set *set)
 	set->nr_hw_queues = hw_queues;
 	set->queue_depth = queue_depth;
 	set->numa_node = numa_node;
+	set->timeout = 5 * HZ;
 	if (poll_queues) {
 		set->nr_hw_queues += poll_queues;
 		set->nr_maps = 3;
@@ -1921,7 +1922,6 @@ static int null_add_dev(struct nullb_device *dev)
 	if (rv)
 		goto out_cleanup_queues;
 
-	nullb->tag_set->timeout = 5 * HZ;
 	nullb->disk = blk_mq_alloc_disk(nullb->tag_set, NULL, nullb);
 	if (IS_ERR(nullb->disk)) {
 		rv = PTR_ERR(nullb->disk);