=============================================
[ INFO: possible recursive locking detected ]
2.6.39+lockdep #1
---------------------------------------------
modprobe/6613 is trying to acquire lock:
 (core_lock){+.+.+.}, at: [<ffffffffa01f5042>] i2c_add_adapter+0x35/0x8b [i2c_core]

but task is already holding lock:
 (core_lock){+.+.+.}, at: [<ffffffffa01f35fe>] i2c_for_each_dev+0x1f/0x4e [i2c_core]

other info that might help us debug this:
1 lock held by modprobe/6613:
 #0:  (core_lock){+.+.+.}, at: [<ffffffffa01f35fe>] i2c_for_each_dev+0x1f/0x4e [i2c_core]

stack backtrace:
Pid: 6613, comm: modprobe Not tainted 2.6.39+lockdep #1
Call Trace:
 [<ffffffff810768f9>] __lock_acquire+0xd48/0xdd0
 [<ffffffff811c58fe>] ? number.clone.1+0x138/0x24c
 [<ffffffff811c58fe>] ? number.clone.1+0x138/0x24c
 [<ffffffffa01f5042>] ? i2c_add_adapter+0x35/0x8b [i2c_core]
 [<ffffffff81076eaa>] lock_acquire+0xd4/0xfe
 [<ffffffffa01f5042>] ? i2c_add_adapter+0x35/0x8b [i2c_core]
 [<ffffffffa01f5042>] ? i2c_add_adapter+0x35/0x8b [i2c_core]
 [<ffffffffa01f500d>] ? i2c_add_numbered_adapter+0xb2/0xb2 [i2c_core]
 [<ffffffff8135eacc>] __mutex_lock_common+0x47/0x377
 [<ffffffffa01f5042>] ? i2c_add_adapter+0x35/0x8b [i2c_core]
 [<ffffffff810729ca>] ? trace_hardirqs_off+0xd/0xf
 [<ffffffff81360312>] ? _raw_spin_unlock_irqrestore+0x39/0x4d
 [<ffffffff81074624>] ? mark_lock+0x2d/0x210
 [<ffffffffa01f500d>] ? i2c_add_numbered_adapter+0xb2/0xb2 [i2c_core]
 [<ffffffff8135ee82>] mutex_lock_nested+0x28/0x2f
 [<ffffffffa01f5042>] i2c_add_adapter+0x35/0x8b [i2c_core]
 [<ffffffffa02293eb>] __i2c_bit_add_bus+0x203/0x24d [i2c_algo_bit]
 [<ffffffffa0229457>] i2c_bit_add_bus+0x10/0x12 [i2c_algo_bit]
 [<ffffffffa047886e>] intel_gpio_create+0x133/0x151 [i915]
 [<ffffffffa0478e12>] gmbus_xfer+0x3bc/0x56c [i915]
 [<ffffffffa01f3dc2>] i2c_transfer+0x85/0xc9 [i2c_core]
 [<ffffffffa01f4160>] i2c_smbus_xfer_emulated+0x35a/0x48c [i2c_core]
 [<ffffffff810729ca>] ? trace_hardirqs_off+0xd/0xf
 [<ffffffff81068a9a>] ? local_clock+0x36/0x4d
 [<ffffffff81072de4>] ? lock_release_holdtime+0x54/0x5b
 [<ffffffffa01f4404>] i2c_smbus_xfer+0xdf/0xee [i2c_core]
 [<ffffffff8136034c>] ? _raw_spin_unlock+0x26/0x2a
 [<ffffffff81349640>] ? klist_next+0x91/0xae
 [<ffffffffa01f48ea>] i2c_default_probe+0xa1/0x108 [i2c_core]
 [<ffffffffa01f3c9a>] ? i2c_check_addr_busy+0x46/0x4d [i2c_core]
 [<ffffffffa01f51c9>] i2c_do_add_adapter+0xd8/0x23a [i2c_core]
 [<ffffffff8136034c>] ? _raw_spin_unlock+0x26/0x2a
 [<ffffffffa01f532b>] ? i2c_do_add_adapter+0x23a/0x23a [i2c_core]
 [<ffffffffa01f534d>] __process_new_driver+0x22/0x24 [i2c_core]
 [<ffffffff81266720>] bus_for_each_dev+0x57/0x83
 [<ffffffffa01f532b>] ? i2c_do_add_adapter+0x23a/0x23a [i2c_core]
 [<ffffffffa01f3612>] i2c_for_each_dev+0x33/0x4e [i2c_core]
 [<ffffffffa00a6000>] ? 0xffffffffa00a5fff
 [<ffffffffa01f36f2>] i2c_register_driver+0x9f/0xa7 [i2c_core]
 [<ffffffffa00a6000>] ? 0xffffffffa00a5fff
 [<ffffffffa00a6017>] eeprom_init+0x17/0x1000 [eeprom]
 [<ffffffff81002184>] do_one_initcall+0x7a/0x136
 [<ffffffff81081942>] sys_init_module+0xdd/0x22c
 [<ffffffff813669d2>] system_call_fastpath+0x16/0x1b