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    Subject[PATCH 3.18 53/90] dm: remove duplicate dm_get_live_table() in __dm_destroy()
    Date
    3.18-stable review patch.  If anyone has any objections, please let me know.

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

    From: Corey Wright <undefined@pobox.com>

    [3.18.y only, to fix a previous patch]

    __dm_destroy() takes io_barrier SRCU lock (dm_get_live_table) twice
    which leads to a deadlock. Remove taking lock before holding
    suspend_lock to prevent a different potential deadlock.

    Signed-off-by: Corey Wright <undefined@pobox.com>
    Fixes: e1db66a5fdcc ("dm: fix AB-BA deadlock in __dm_destroy()")
    Cc: Sasha Levin <sashal@kernel.org>
    ---
    drivers/md/dm.c | 1 -
    1 file changed, 1 deletion(-)

    --- a/drivers/md/dm.c
    +++ b/drivers/md/dm.c
    @@ -2589,7 +2589,6 @@ static void __dm_destroy(struct mapped_d
    might_sleep();

    spin_lock(&_minor_lock);
    - map = dm_get_live_table(md, &srcu_idx);
    idr_replace(&_minor_idr, MINOR_ALLOCED, MINOR(disk_devt(dm_disk(md))));
    set_bit(DMF_FREEING, &md->flags);
    spin_unlock(&_minor_lock);

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