Joonwoo Park ba611edfe4 configfs: dir.c fix possible recursive locking ... configfs_register_subsystem() with default_groups triggers recursive locking. it seems that mutex_lock_nested is needed. ============================================= [ INFO: possible recursive locking detected ] 2.6.24-rc6 #141 --------------------------------------------- swapper/1 is trying to acquire lock: (&sb->s_type->i_mutex_key#3){--..}, at: [<c40ca76f>] configfs_attach_group+0x4f/0x190 but task is already holding lock: (&sb->s_type->i_mutex_key#3){--..}, at: [<c40ca9d5>] configfs_register_subsystem+0x55/0x130 other info that might help us debug this: 1 lock held by swapper/1: #0: (&sb->s_type->i_mutex_key#3){--..}, at: [<c40ca9d5>] configfs_register_subsystem+0x55/0x130 stack backtrace: Pid: 1, comm: swapper Not tainted 2.6.24-rc6 #141 [<c40053ba>] show_trace_log_lvl+0x1a/0x30 [<c4005e82>] show_trace+0x12/0x20 [<c400687e>] dump_stack+0x6e/0x80 [<c404ec72>] __lock_acquire+0xe62/0x1120 [<c404efb2>] lock_acquire+0x82/0xa0 [<c43fdad8>] mutex_lock_nested+0x98/0x2e0 [<c40ca76f>] configfs_attach_group+0x4f/0x190 [<c40caa46>] configfs_register_subsystem+0xc6/0x130 [<c45c8186>] init_netconsole+0x2b6/0x300 [<c45a75f2>] kernel_init+0x142/0x320 [<c4004fb3>] kernel_thread_helper+0x7/0x14 ======================= Signed-off-by: Joonwoo Park <joonwpark81@gmail.com> Signed-off-by: Joel Becker <joel.becker@oracle.com> Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>		2008-01-25 15:05:47 -08:00
..
configfs_internal.h	mm: bdi init hooks	2007-10-17 08:42:45 -07:00
dir.c	configfs: dir.c fix possible recursive locking	2008-01-25 15:05:47 -08:00
file.c	[PATCH] configsfs buffer: use mutex	2007-07-10 17:10:58 -07:00
inode.c	mm: bdi init hooks	2007-10-17 08:42:45 -07:00
item.c	[PATCH] configfs+dlm: Rename config_group_find_obj and state semantics clearly	2007-07-10 17:02:31 -07:00
Makefile	[PATCH] configfs: User-driven configuration filesystem	2006-01-03 11:45:28 -08:00
mount.c	Kobject: convert fs/* from kobject_unregister() to kobject_put()	2008-01-24 20:40:40 -08:00
symlink.c	[PATCH] mark struct inode_operations const 1	2007-02-12 09:48:46 -08:00