[PATCH] lockdep: annotate sound/core/seq/seq_ports.c

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>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Jaroslav Kysela <perex@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/sound/core/seq/seq_ports.c b/sound/core/seq/seq_ports.c
index d467b4f0ff2b18d50dae96e813a686f7a28821e6..8c64b58ff77bf3afb9e7f82e30209a15c68f0dc9 100644 (file)
--- a/sound/core/seq/seq_ports.c
+++ b/sound/core/seq/seq_ports.c
@@ -514,7 +514,7 @@ int snd_seq_port_connect(struct snd_seq_client *connector,
        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;
@@ -587,7 +587,7 @@ int snd_seq_port_disconnect(struct snd_seq_client *connector,
        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) {