blk-mq: Pass driver tags to blk_mq_clear_rq_mapping()

Function blk_mq_clear_rq_mapping() will be used for shared sbitmap tags
in future, so pass a driver tags pointer instead of the tagset container
and HW queue index.
Signed-off-by: John Garry <john.garry@huawei.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/1633429419-228500-8-git-send-email-john.garry@huawei.comSigned-off-by: Jens Axboe <axboe@kernel.dk>

block/blk-mq.c

@@ -2311,10 +2311,9 @@ static size_t order_to_size(unsigned int order)
 }
 
 /* called before freeing request pool in @tags */
-static void blk_mq_clear_rq_mapping(struct blk_mq_tag_set *set,
-		struct blk_mq_tags *tags, unsigned int hctx_idx)
+static void blk_mq_clear_rq_mapping(struct blk_mq_tags *drv_tags,
+				    struct blk_mq_tags *tags)
 {
-	struct blk_mq_tags *drv_tags = set->tags[hctx_idx];
 	struct page *page;
 	unsigned long flags;
 
@@ -2323,7 +2322,7 @@ static void blk_mq_clear_rq_mapping(struct blk_mq_tag_set *set,
 		unsigned long end = start + order_to_size(page->private);
 		int i;
 
-		for (i = 0; i < set->queue_depth; i++) {
+		for (i = 0; i < drv_tags->nr_tags; i++) {
 			struct request *rq = drv_tags->rqs[i];
 			unsigned long rq_addr = (unsigned long)rq;
 
@@ -2347,8 +2346,11 @@ static void blk_mq_clear_rq_mapping(struct blk_mq_tag_set *set,
 void blk_mq_free_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
 		     unsigned int hctx_idx)
 {
+	struct blk_mq_tags *drv_tags;
 	struct page *page;
 
+	drv_tags = set->tags[hctx_idx];
+
 	if (tags->static_rqs && set->ops->exit_request) {
 		int i;
 
@@ -2362,7 +2364,7 @@ void blk_mq_free_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
 		}
 	}
 
-	blk_mq_clear_rq_mapping(set, tags, hctx_idx);
+	blk_mq_clear_rq_mapping(drv_tags, tags);
 
 	while (!list_empty(&tags->page_list)) {
 		page = list_first_entry(&tags->page_list, struct page, lru);