Based ideas from Jiri Kosina, this patch tracks the nesting depth and uses the new lockdep_set_class_and_subclass() annotation to store this information in the lock objects. Signed-of-by: Peter Zijlstra --- drivers/input/serio/libps2.c | 4 ++++ drivers/input/serio/serio.c | 9 ++++++++- include/linux/serio.h | 1 + 3 files changed, 13 insertions(+), 1 deletion(-) Index: linux-2.6-mm/drivers/input/serio/libps2.c =================================================================== --- linux-2.6-mm.orig/drivers/input/serio/libps2.c 2006-09-26 10:25:22.000000000 +0200 +++ linux-2.6-mm/drivers/input/serio/libps2.c 2006-09-26 10:34:49.000000000 +0200 @@ -280,6 +280,8 @@ int ps2_schedule_command(struct ps2dev * return 0; } +static struct lock_class_key ps2_mutex_key; + /* * ps2_init() initializes ps2dev structure */ @@ -287,6 +289,8 @@ int ps2_schedule_command(struct ps2dev * void ps2_init(struct ps2dev *ps2dev, struct serio *serio) { mutex_init(&ps2dev->cmd_mutex); + lockdep_set_class_and_subclass(&ps2dev->cmd_mutex, &ps2_mutex_key, + serio->depth); init_waitqueue_head(&ps2dev->wait); ps2dev->serio = serio; } Index: linux-2.6-mm/drivers/input/serio/serio.c =================================================================== --- linux-2.6-mm.orig/drivers/input/serio/serio.c 2006-09-26 10:25:22.000000000 +0200 +++ linux-2.6-mm/drivers/input/serio/serio.c 2006-09-26 10:34:04.000000000 +0200 @@ -521,6 +521,8 @@ static void serio_release_port(struct de module_put(THIS_MODULE); } +static struct lock_class_key serio_lock_key; + /* * Prepare serio port for registration. */ @@ -538,8 +540,13 @@ static void serio_init_port(struct serio "serio%ld", (long)atomic_inc_return(&serio_no) - 1); serio->dev.bus = &serio_bus; serio->dev.release = serio_release_port; - if (serio->parent) + if (serio->parent) { serio->dev.parent = &serio->parent->dev; + serio->depth = serio->parent->depth + 1; + } else + serio->depth = 0; + lockdep_set_class_and_subclass(&serio->lock, &serio_lock_key, + serio->depth); } /* Index: linux-2.6-mm/include/linux/serio.h =================================================================== --- linux-2.6-mm.orig/include/linux/serio.h 2006-09-26 10:25:22.000000000 +0200 +++ linux-2.6-mm/include/linux/serio.h 2006-09-26 10:34:04.000000000 +0200 @@ -41,6 +41,7 @@ struct serio { void (*stop)(struct serio *); struct serio *parent, *child; + unsigned int depth; /* level of nesting in serio hierarchy */ struct serio_driver *drv; /* accessed from interrupt, must be protected by serio->lock and serio->sem */ struct mutex drv_mutex; /* protects serio->drv so attributes can pin driver */ -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/