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    Subject[patch 60/61] lock validator: special locking: sound/core/seq/seq_ports.c
    From: Ingo Molnar <mingo@elte.hu>

    teach special (recursive) locking code to the lock validator. Has no
    effect on non-lockdep kernels.

    Signed-off-by: Ingo Molnar <mingo@elte.hu>
    Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
    ---
    sound/core/seq/seq_ports.c | 4 ++--
    1 file changed, 2 insertions(+), 2 deletions(-)

    Index: linux/sound/core/seq/seq_ports.c
    ===================================================================
    --- linux.orig/sound/core/seq/seq_ports.c
    +++ linux/sound/core/seq/seq_ports.c
    @@ -518,7 +518,7 @@ int snd_seq_port_connect(struct snd_seq_
    atomic_set(&subs->ref_count, 2);

    down_write(&src->list_mutex);
    - down_write(&dest->list_mutex);
    + down_write_nested(&dest->list_mutex, SINGLE_DEPTH_NESTING);

    exclusive = info->flags & SNDRV_SEQ_PORT_SUBS_EXCLUSIVE ? 1 : 0;
    err = -EBUSY;
    @@ -591,7 +591,7 @@ int snd_seq_port_disconnect(struct snd_s
    unsigned long flags;

    down_write(&src->list_mutex);
    - down_write(&dest->list_mutex);
    + down_write_nested(&dest->list_mutex, SINGLE_DEPTH_NESTING);

    /* look for the connection */
    list_for_each(p, &src->list_head) {
    -
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