Input: serio - add lockdep annotations

Signed-off-by: Jiri Kosina <jikos@jikos.cz>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

diff --git a/drivers/input/serio/libps2.c b/drivers/input/serio/libps2.c
index dcb16b5..e5b1b60 100644 (file)
--- a/drivers/input/serio/libps2.c
+++ b/drivers/input/serio/libps2.c
@@ -189,7 +189,7 @@ int ps2_command(struct ps2dev *ps2dev, unsigned char *param, int command)
                return -1;
        }
 
-       mutex_lock_nested(&ps2dev->cmd_mutex, SINGLE_DEPTH_NESTING);
+       mutex_lock(&ps2dev->cmd_mutex);
 
        serio_pause_rx(ps2dev->serio);
        ps2dev->flags = command == PS2_CMD_GETID ? PS2_FLAG_WAITID : 0;
@@ -296,6 +296,7 @@ EXPORT_SYMBOL(ps2_schedule_command);
 void ps2_init(struct ps2dev *ps2dev, struct serio *serio)
 {
        mutex_init(&ps2dev->cmd_mutex);
+       lockdep_set_subclass(&ps2dev->cmd_mutex, serio->depth);
        init_waitqueue_head(&ps2dev->wait);
        ps2dev->serio = serio;
 }

diff --git a/drivers/input/serio/serio.c b/drivers/input/serio/serio.c
index 960fae3..480fdc5 100644 (file)
--- a/drivers/input/serio/serio.c
+++ b/drivers/input/serio/serio.c
@@ -538,8 +538,12 @@ static void serio_init_port(struct serio *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_subclass(&serio->lock, serio->depth);
 }
 
 /*

diff --git a/include/linux/serio.h b/include/linux/serio.h
index 3a697cc..b99c5ca 100644 (file)
--- a/include/linux/serio.h
+++ b/include/linux/serio.h
@@ -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 */