lockdep whine in 2.6.26-rc2-mm1

[Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>]

=============================================
[ INFO: possible recursive locking detected ]
2.6.26-rc2-mm1 #15
---------------------------------------------
modprobe/942 is trying to acquire lock:
 (&cls->mutex){--..}, at: [<ffffffff811b431e>] device_add+0x43d/0x57a

but task is already holding lock:
 (&cls->mutex){--..}, at: [<ffffffff811b6787>] class_interface_register+0x48/0xbd

other info that might help us debug this:
1 lock held by modprobe/942:
 #0:  (&cls->mutex){--..}, at: [<ffffffff811b6787>] class_interface_register+0x48/0xbd

stack backtrace:
Pid: 942, comm: modprobe Not tainted 2.6.26-rc2-mm1 #15

Call Trace:
 [<ffffffff81056be1>] __lock_acquire+0x90d/0xc50
 [<ffffffff8100c50f>] ? restore_args+0x0/0x30
 [<ffffffff811b431e>] ? device_add+0x43d/0x57a
 [<ffffffff81057276>] lock_acquire+0x91/0xb7
 [<ffffffff811b431e>] ? device_add+0x43d/0x57a
 [<ffffffff812b23ab>] mutex_lock_nested+0xf2/0x278
 [<ffffffff811b431e>] ? device_add+0x43d/0x57a
 [<ffffffff812b3acd>] ? _spin_unlock+0x23/0x28
 [<ffffffff811b431e>] device_add+0x43d/0x57a
 [<ffffffff811b4471>] device_register+0x16/0x1b
 [<ffffffff811b4555>] device_create+0xdf/0x112
 [<ffffffff81055fdc>] ? trace_hardirqs_on+0xd/0xf
 [<ffffffff81055fdc>] ? trace_hardirqs_on+0xd/0xf
 [<ffffffff812b1fe1>] ? mutex_unlock+0x9/0xb
 [<ffffffff811b79b7>] ? kobj_map+0x113/0x124
 [<ffffffff810ac0f5>] ? exact_lock+0x0/0x14
 [<ffffffff810abd09>] ? exact_match+0x0/0x9
 [<ffffffffa00ec448>] :sg:sg_add+0x2a3/0x3bd
 [<ffffffff811b67b6>] class_interface_register+0x77/0xbd
 [<ffffffffa005d869>] :scsi_mod:scsi_register_interface+0x11/0x13
 [<ffffffffa00d50a3>] :sg:init_sg+0xa3/0x155
 [<ffffffff8105ea8f>] sys_init_module+0x1823/0x197a
 [<ffffffff810c45bc>] ? seq_release+0x0/0x56
 [<ffffffff8100bebb>] system_call_after_swapgs+0x7b/0x80

Driver 'sr' needs updating - please use bus_type methods
sd 0:0:0:0: Attached scsi generic sg0 type 0
sr0: scsi3-mmc drive: 24x/24x writer dvd-ram cd/rw xa/form2 cdda tray
Uniform CD-ROM driver Revision: 3.20
sr 3:0:0:0: Attached scsi CD-ROM sr0
sr 3:0:0:0: Attached scsi generic sg1 type 5


Full dmesg: http://userweb.kernel.org/~akpm/dmesg-t61p.txt
Config: http://userweb.kernel.org/~akpm/config-t61p.txt


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