If del_gendisk() is done when some io are still throttled, such io will not be handled until the throttle is done, which is not necessary. This patch series handle such io in del_gendisk(). Yu Kuai (4): Revert "blk-throttle: remove tg_drain_bios" blk-throtl: don't warn in tg_drain_bios() blk-throtl: introduce blk_throtl_cancel_bios() block: cancel all throttled bios in del_gendisk() block/blk-throttle.c | 68 +++++++++++++++++++++++++++++++++++++++++--- block/blk-throttle.h | 2 ++ block/genhd.c | 2 ++ 3 files changed, 68 insertions(+), 4 deletions(-) -- 2.31.1