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    Subject[PATCH v3 08/13] blk-mq: Don't clear driver tags own mapping
    Date
    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>
    ---
    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
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