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    Subject[PATCH 4.12 103/196] f2fs: wake up all waiters in f2fs_submit_discard_endio
    Date
    4.12-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Chao Yu <yuchao0@huawei.com>

    commit e31b98215779e66a490471c6ad886ae231316699 upstream.

    There could be more than one waiter waiting discard IO completion, so we
    need use complete_all() instead of complete() in f2fs_submit_discard_endio
    to avoid hungtask.

    Fixes: ec9895add2c5 ("f2fs: don't hold cmd_lock during waiting discard
    command")
    Signed-off-by: Chao Yu <yuchao0@huawei.com>
    Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    fs/f2fs/segment.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/fs/f2fs/segment.c
    +++ b/fs/f2fs/segment.c
    @@ -751,7 +751,7 @@ static void f2fs_submit_discard_endio(st

    dc->error = bio->bi_error;
    dc->state = D_DONE;
    - complete(&dc->wait);
    + complete_all(&dc->wait);
    bio_put(bio);
    }


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