misc: tizen_global_lock: add support for 32bt compat mode from 64bit

This patch adds support for 32bit compat mode, including compat_ioctl,
pointer casting and compat ioctl cmd, from 64bit system.

Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>

2 files changed, 28 insertions, 4 deletions

diff --git a/drivers/misc/tizen_global_lock.c b/drivers/misc/tizen_global_lock.c
index 95cd0400c698..9a5414f62efc 100644
--- a/drivers/misc/tizen_global_lock.c
+++ b/drivers/misc/tizen_global_lock.c
@@ -51,7 +51,7 @@ struct tgl_lock {
 	struct list_head	waiting_list;	/* waiting list */
 	struct mutex		waiting_list_mutex;
 	unsigned int		locked;		/* flag if is locked */
-	unsigned int		owner;		/* session data */
+	struct tgl_session_data	*owner;		/* session data */
 
 	struct mutex		data_mutex;
 	unsigned int		user_data1;
@@ -324,7 +324,7 @@ static int tgl_lock_lock(struct tgl_session_data *session_data,
 	TGL_LOG();
 
 	mutex_lock(&lock->data_mutex);
-	lock->owner = (unsigned int)session_data;
+	lock->owner = session_data;
 	lock->locked = 1;
 	lock->owner_pid = current->tgid;
 	lock->owner_tid = current->pid;
@@ -358,7 +358,7 @@ static int _tgl_unlock_lock(struct tgl_lock *lock)
 		return -EBADRQC;
 	}
 
-	lock->owner = 0;
+	lock->owner = NULL;
 	lock->locked = 0;
 	lock->owner_pid = 0;
 	lock->owner_tid = 0;
@@ -404,7 +404,7 @@ static int tgl_unlock_lock(struct tgl_session_data *session_data,
 	mutex_unlock(&tgl_global.mutex);
 
 	mutex_lock(&lock->data_mutex);
-	if (lock->owner != (unsigned int)session_data) {
+	if (lock->owner != session_data) {
 		mutex_unlock(&lock->data_mutex);
 		TGL_WARN("tried to unlock not-owned lock by calling session");
 		return -EBADRQC;
@@ -647,6 +647,9 @@ static long tgl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 
 	switch (cmd) {
 	case TGL_IOC_INIT_LOCK:
+#ifdef CONFIG_COMPAT
+	case TGL_IOC_INIT_LOCK_COMPAT:
+#endif
 		/* destroy lock with attribute */
 		err = tgl_init_lock(session_data, (struct tgl_attribute *)arg);
 		break;
@@ -663,12 +666,21 @@ static long tgl_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 		err = tgl_unlock_lock(session_data, (unsigned int)arg);
 		break;
 	case TGL_IOC_SET_DATA:
+#ifdef CONFIG_COMPAT
+	case TGL_IOC_SET_DATA_COMPAT:
+#endif
 		err = tgl_set_data(session_data, (struct tgl_user_data *)arg);
 		break;
 	case TGL_IOC_GET_DATA:
+#ifdef CONFIG_COMPAT
+	case TGL_IOC_GET_DATA_COMPAT:
+#endif
 		err = tgl_get_data(session_data, (struct tgl_user_data *)arg);
 		break;
 	case TGL_IOC_DUMP_LOCKS:
+#ifdef CONFIG_COMPAT
+	case TGL_IOC_DUMP_LOCKS_COMPAT:
+#endif
 		tgl_dump_locks();
 		break;
 	default:
@@ -762,6 +774,9 @@ static const struct file_operations tgl_ops = {
 	.open = tgl_open,
 	.release = tgl_release,
 	.unlocked_ioctl = tgl_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl = tgl_ioctl,
+#endif
 };
 
 static int __init tgl_init(void)
diff --git a/drivers/misc/tizen_global_lock.h b/drivers/misc/tizen_global_lock.h
index 38eb5fcd0c08..2e6eadccea97 100644
--- a/drivers/misc/tizen_global_lock.h
+++ b/drivers/misc/tizen_global_lock.h
@@ -38,6 +38,9 @@ enum tgl_ioctls {
 
 #define TGL_IOC_INIT_LOCK	_IOW(TGL_IOC_BASE, TGL_INIT_LOCK,	\
 					struct tgl_attribute *)
+#define TGL_IOC_INIT_LOCK_COMPAT					\
+				_IOW(TGL_IOC_BASE, TGL_INIT_LOCK,	\
+					unsigned int)
 #define TGL_IOC_DESTROY_LOCK	_IOW(TGL_IOC_BASE, TGL_DESTROY_LOCK,	\
 					unsigned int)
 #define TGL_IOC_LOCK_LOCK	_IOW(TGL_IOC_BASE, TGL_LOCK_LOCK,	\
@@ -46,8 +49,14 @@ enum tgl_ioctls {
 					unsigned int)
 #define TGL_IOC_SET_DATA	_IOW(TGL_IOC_BASE, TGL_SET_DATA,	\
 					struct tgl_user_data *)
+#define TGL_IOC_SET_DATA_COMPAT	_IOW(TGL_IOC_BASE, TGL_SET_DATA,	\
+					unsigned int)
 #define TGL_IOC_GET_DATA	_IOW(TGL_IOC_BASE, TGL_GET_DATA,	\
 					struct tgl_user_data *)
+#define TGL_IOC_GET_DATA_COMPAT	_IOW(TGL_IOC_BASE, TGL_GET_DATA,	\
+					unsigned int)
 #define TGL_IOC_DUMP_LOCKS	_IOW(TGL_IOC_BASE, TGL_DUMP_LOCKS, void *)
+#define TGL_IOC_DUMP_LOCKS_COMPAT					\
+				_IOW(TGL_IOC_BASE, TGL_DUMP_LOCKS, unsigned int)
 
 #endif /* __TIZEN_GLOBAL_LOCK_H__ */