diff options
| author | Jeffle Xu <jefflexu@linux.alibaba.com> | 2021-02-22 09:54:52 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-02-22 16:40:02 +0300 |
| commit | 6b09b4d33bd964f49d07d3cabfb4204d58cf9811 (patch) | |
| tree | 7b69248f21d2b2c7db0e8b6f9e8131d8c45515ed /drivers/block | |
| parent | b357e4a694ac4b95096715df253548f7e1f2723f (diff) | |
| download | linux-6b09b4d33bd964f49d07d3cabfb4204d58cf9811.tar.xz | |
block: fix potential IO hang when turning off io_poll
QUEUE_FLAG_POLL flag will be cleared when turning off 'io_poll', while
at that moment there may be IOs stuck in hw queue uncompleted. The
following polling routine won't help reap these IOs, since blk_poll()
will return immediately because of cleared QUEUE_FLAG_POLL flag. Thus
these IOs will hang until they finnaly time out. The hang out can be
observed by 'fio --engine=io_uring iodepth=1', while turning off
'io_poll' at the same time.
To fix this, freeze and flush the request queue first when turning off
'io_poll'.
Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block')
0 files changed, 0 insertions, 0 deletions