diff options
author | Yu Kuai <yukuai3@huawei.com> | 2024-02-01 12:25:51 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-03-01 15:35:00 +0300 |
commit | 02dad157ba11064d073f5499dc33552b227d5d3a (patch) | |
tree | bb8992e5bd0dbfc8b9c6564249793b22f23f1ba2 /drivers/md | |
parent | 8b004583dbc9da62ad2aebf63a9e20815b3b433c (diff) | |
download | linux-02dad157ba11064d073f5499dc33552b227d5d3a.tar.xz |
md: Fix missing release of 'active_io' for flush
commit 855678ed8534518e2b428bcbcec695de9ba248e8 upstream.
submit_flushes
atomic_set(&mddev->flush_pending, 1);
rdev_for_each_rcu(rdev, mddev)
atomic_inc(&mddev->flush_pending);
bi->bi_end_io = md_end_flush
submit_bio(bi);
/* flush io is done first */
md_end_flush
if (atomic_dec_and_test(&mddev->flush_pending))
percpu_ref_put(&mddev->active_io)
-> active_io is not released
if (atomic_dec_and_test(&mddev->flush_pending))
-> missing release of active_io
For consequence, mddev_suspend() will wait for 'active_io' to be zero
forever.
Fix this problem by releasing 'active_io' in submit_flushes() if
'flush_pending' is decreased to zero.
Fixes: fa2bbff7b0b4 ("md: synchronize flush io with array reconfiguration")
Cc: stable@vger.kernel.org # v6.1+
Reported-by: Blazej Kucman <blazej.kucman@linux.intel.com>
Closes: https://lore.kernel.org/lkml/20240130172524.0000417b@linux.intel.com/
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20240201092559.910982-7-yukuai1@huaweicloud.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/md')
-rw-r--r-- | drivers/md/md.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index 108590041db6..ce0516bdf8fa 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -530,8 +530,12 @@ static void submit_flushes(struct work_struct *ws) rcu_read_lock(); } rcu_read_unlock(); - if (atomic_dec_and_test(&mddev->flush_pending)) + if (atomic_dec_and_test(&mddev->flush_pending)) { + /* The pair is percpu_ref_get() from md_flush_request() */ + percpu_ref_put(&mddev->active_io); + queue_work(md_wq, &mddev->flush_work); + } } static void md_submit_flush_data(struct work_struct *ws) |