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authorArjan van de Ven <arjan@linux.intel.com>2006-07-03 00:25:22 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-03 15:27:08 -0700
commit933a2efc59513551dcfa7b814752dc581bd3c60b (patch)
tree6c97a7bff4100759dfa9ae5d198b341f1e4996ae /sound
parentd8371f0481fd1ad2701081d37815b0bb5d236b92 (diff)
[PATCH] lockdep: annotate sound/core/seq/seq_device.c
The ops structure has complex locking rules, where not all ops are equal, some are subordinate on others for some complex sound cards. This requires for lockdep checking that each individual reg_mutex is considered in separation for its locking rules. Has no effect on non-lockdep kernels. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Cc: Ingo Molnar <mingo@elte.hu> 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>
Diffstat (limited to 'sound')
-rw-r--r--sound/core/seq/seq_device.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/sound/core/seq/seq_device.c b/sound/core/seq/seq_device.c
index d812dc88636..4260de90f36 100644
--- a/sound/core/seq/seq_device.c
+++ b/sound/core/seq/seq_device.c
@@ -380,6 +380,12 @@ static struct ops_list * create_driver(char *id)
/* set up driver entry */
strlcpy(ops->id, id, sizeof(ops->id));
mutex_init(&ops->reg_mutex);
+ /*
+ * The ->reg_mutex locking rules are per-driver, so we create
+ * separate per-driver lock classes:
+ */
+ lockdep_set_class(&ops->reg_mutex, (struct lock_class_key *)id);
+
ops->driver = DRIVER_EMPTY;
INIT_LIST_HEAD(&ops->dev_list);
/* lock this instance */