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    Subject[PATCH AUTOSEL for 4.4 031/101] md/raid10: wait up frozen array in handle_write_completed
    Date
    From: Guoqing Jiang <gqjiang@suse.com>

    [ Upstream commit cf25ae78fc50010f66b9be945017796da34c434d ]

    Since nr_queued is changed, we need to call wake_up here
    if the array is already frozen and waiting for condition
    "nr_pending == nr_queued + extra" to be true.

    And commit 824e47daddbf ("RAID1: avoid unnecessary spin
    locks in I/O barrier code") which has already added the
    wake_up for raid1.

    Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
    Reviewed-by: NeilBrown <neilb@suse.com>
    Signed-off-by: Shaohua Li <shli@fb.com>
    Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
    ---
    drivers/md/raid10.c | 5 +++++
    1 file changed, 5 insertions(+)

    diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
    index a8a86d450d76..05548af8df6f 100644
    --- a/drivers/md/raid10.c
    +++ b/drivers/md/raid10.c
    @@ -2698,6 +2698,11 @@ static void handle_write_completed(struct r10conf *conf, struct r10bio *r10_bio)
    list_add(&r10_bio->retry_list, &conf->bio_end_io_list);
    conf->nr_queued++;
    spin_unlock_irq(&conf->device_lock);
    + /*
    + * In case freeze_array() is waiting for condition
    + * nr_pending == nr_queued + extra to be true.
    + */
    + wake_up(&conf->wait_barrier);
    md_wakeup_thread(conf->mddev->thread);
    } else {
    if (test_bit(R10BIO_WriteError,
    --
    2.14.1
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