From: John Garry <john.garry@huawei.com>
Date: Tue, 5 Oct 2021 18:23:33 +0800
Subject: [PATCH] blk-mq: Don't clear driver tags own mapping
Git-commit: 4f245d5bf0f7432c881e22a77066160a6cba8e03
Patch-mainline: v5.16-rc1
References: jsc#PED-1183
Function blk_mq_clear_rq_mapping() is required to clear the sched tags
mappings in driver tags rqs[].
But there is no need for a driver tags to clear its own mapping, so skip
clearing the mapping in this scenario.
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/1633429419-228500-9-git-send-email-john.garry@huawei.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Hannes Reinecke <hare@suse.com>
---
block/blk-mq.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 0619298d82b4..38cffe362a29 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2317,6 +2317,10 @@ static void blk_mq_clear_rq_mapping(struct blk_mq_tags *drv_tags,
struct page *page;
unsigned long flags;
+ /* There is no need to clear a driver tags own mapping */
+ if (drv_tags == tags)
+ return;
+
list_for_each_entry(page, &tags->page_list, lru) {
unsigned long start = (unsigned long)page_address(page);
unsigned long end = start + order_to_size(page->private);
--
2.35.3