LOCKDEP: input layer warning.

[Luiz Fernando N. Capitulino]

 Hi Dmitry,

 A Mandriva user is getting the lockdep warning bellow when running an
unpatched 2.6.18-rc5 kernel.

 But according to this thread:

http://www.uwsg.iu.edu/hypermail/linux/kernel/0607.0/1598.html

 this was reported already, but not fixed.

=============================================
[ INFO: possible recursive locking detected ]
---------------------------------------------
kseriod/187 is trying to acquire lock:
 (&ps2dev->cmd_mutex/1){--..}, at: [<c024b1da>] ps2_command+0x7b/0x2d6

but task is already holding lock:
 (&ps2dev->cmd_mutex/1){--..}, at: [<c024b1da>] ps2_command+0x7b/0x2d6

other info that might help us debug this:
4 locks held by kseriod/187:
 #0:  (serio_mutex){--..}, at: [<c02bfd62>] mutex_lock+0x1c/0x1f
 #1:  (&serio->drv_mutex){--..}, at: [<c02bfd62>] mutex_lock+0x1c/0x1f
 #2:  (psmouse_mutex){--..}, at: [<c02bfd62>] mutex_lock+0x1c/0x1f
 #3:  (&ps2dev->cmd_mutex/1){--..}, at: [<c024b1da>] ps2_command+0x7b/0x2d6

stack backtrace:
 [<c010454c>] show_trace_log_lvl+0x58/0x152
 [<c0104b2c>] show_trace+0xd/0x10
 [<c0104c42>] dump_stack+0x19/0x1b
 [<c0135d2a>] __lock_acquire+0x755/0x973
 [<c013648b>] lock_acquire+0x4b/0x6c
 [<c02bfe28>] mutex_lock_nested+0xc3/0x209
 [<c024b1da>] ps2_command+0x7b/0x2d6
 [<c024fa91>] psmouse_sliced_command+0x1c/0x5a
 [<c0252f9a>] synaptics_pt_write+0x1e/0x44
 [<c024b0c7>] ps2_sendbyte+0x3e/0xd6
 [<c024b25b>] ps2_command+0xfc/0x2d6
 [<c024f6c4>] psmouse_probe+0x1d/0x68
 [<c025061a>] psmouse_connect+0xe8/0x20f
 [<c0248f76>] serio_connect_driver+0x1e/0x2e
 [<c0248f9c>] serio_driver_probe+0x16/0x18
 [<c022b08a>] driver_probe_device+0x45/0x92
 [<c022b0df>] __device_attach+0x8/0xa
 [<c022aa29>] bus_for_each_drv+0x3c/0x67
 [<c022b135>] device_attach+0x54/0x69
 [<c022a765>] bus_attach_device+0x16/0x2b
 [<c0229bcf>] device_add+0x1f8/0x2e3
 [<c0249a09>] serio_thread+0xd0/0x28f
 [<c0130a1d>] kthread+0xc3/0xf2
 [<c0101005>] kernel_thread_helper+0x5/0xb
DWARF2 unwinder stuck at kernel_thread_helper+0x5/0xb
Leftover inexact backtrace:
 [<c0104b2c>] show_trace+0xd/0x10
 [<c0104c42>] dump_stack+0x19/0x1b
 [<c0135d2a>] __lock_acquire+0x755/0x973
 [<c013648b>] lock_acquire+0x4b/0x6c
 [<c02bfe28>] mutex_lock_nested+0xc3/0x209
 [<c024b1da>] ps2_command+0x7b/0x2d6
 [<c024fa91>] psmouse_sliced_command+0x1c/0x5a
 [<c0252f9a>] synaptics_pt_write+0x1e/0x44
 [<c024b0c7>] ps2_sendbyte+0x3e/0xd6
 [<c024b25b>] ps2_command+0xfc/0x2d6
 [<c024f6c4>] psmouse_probe+0x1d/0x68
 [<c025061a>] psmouse_connect+0xe8/0x20f
 [<c0248f76>] serio_connect_driver+0x1e/0x2e
 [<c0248f9c>] serio_driver_probe+0x16/0x18
 [<c022b08a>] driver_probe_device+0x45/0x92
 [<c022b0df>] __device_attach+0x8/0xa
 [<c022aa29>] bus_for_each_drv+0x3c/0x67
 [<c022b135>] device_attach+0x54/0x69
 [<c022a765>] bus_attach_device+0x16/0x2b
 [<c0229bcf>] device_add+0x1f8/0x2e3
 [<c0249a09>] serio_thread+0xd0/0x28f
 [<c0130a1d>] kthread+0xc3/0xf2
 [<c0101005>] kernel_thread_helper+0x5/0xb

-- 
Luiz Fernando N. Capitulino
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