[PATCH v3 08/13] blk-mq: Don't clear driver tags own mapping
From: John Garry <hidden>
Date: 2021-08-27 12:07:13
Also in:
linux-scsi, lkml
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
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 <redacted> --- block/blk-mq.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 556c203e6b7c..09380274d2d6 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c@@ -2316,6 +2316,10 @@ 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);
--
2.26.2