Hi,

Running linux-next 20151126 on a mx28evk leads to the following bug:

sgtl5000 0-000a: sgtl5000 revision 0x11 sgtl5000 0-000a: Using internal LDO instead of VDDD

===================================== [ BUG: bad unlock balance detected! ] 4.4.0-rc2-next-20151126-00001-g44eb6b2 #156 Not tainted ------------------------------------- kworker/u2:0/6 is trying to release lock (&rdev->mutex) at: [<c02e7858>] regulator_get_voltage+0x30/0x44 but there are no more locks to release!

other info that might help us debug this: 5 locks held by kworker/u2:0/6: #0: ("%s""deferwq"){++++.+}, at: [<c002f1f8>] process_one_work+0x10c/0x49c #1: (deferred_probe_work){+.+.+.}, at: [<c002f1f8>] process_one_work+0x10c/0x49c #2: (&dev->mutex){......}, at: [<c03197bc>] __device_attach+0x20/0x108 #3: (client_mutex){+.+.+.}, at: [<c042dc34>] snd_soc_register_card+0x280/0x1108 #4: (&card->mutex){+.+.+.}, at: [<c042dc40>] snd_soc_register_card+0x28c/0x1108

stack backtrace: CPU: 0 PID: 6 Comm: kworker/u2:0 Not tainted 4.4.0-rc2-next-20151126-00001-g44eb6b2 #156 Hardware name: Freescale MXS (Device Tree) Workqueue: deferwq deferred_probe_work_func [<c000eea0>] (unwind_backtrace) from [<c000cfa0>] (show_stack+0x10/0x14) [<c000cfa0>] (show_stack) from [<c0049350>] (print_unlock_imbalance_bug+0xac/0xdc) [<c0049350>] (print_unlock_imbalance_bug) from [<c004c2f8>] (lock_release+0x2a4/0x38c) [<c004c2f8>] (lock_release) from [<c0513e70>] (__mutex_unlock_slowpath+0x7c/0x15c) [<c0513e70>] (__mutex_unlock_slowpath) from [<c02e7858>] (regulator_get_voltage+0x30/0x44) [<c02e7858>] (regulator_get_voltage) from [<c043c200>] (sgtl5000_probe+0x1c0/0x5f0) [<c043c200>] (sgtl5000_probe) from [<c0428a74>] (snd_soc_codec_drv_probe+0x14/0x18) [<c0428a74>] (snd_soc_codec_drv_probe) from [<c042cd54>] (soc_probe_component+0x200/0x330) [<c042cd54>] (soc_probe_component) from [<c042e178>] (snd_soc_register_card+0x7c4/0x1108) [<c042e178>] (snd_soc_register_card) from [<c0439cdc>] (devm_snd_soc_register_card+0x30/0x70) [<c0439cdc>] (devm_snd_soc_register_card) from [<c043d1cc>] (mxs_sgtl5000_probe+0xc8/0x138) [<c043d1cc>] (mxs_sgtl5000_probe) from [<c031b1fc>] (platform_drv_probe+0x50/0xac) [<c031b1fc>] (platform_drv_probe) from [<c0319ab0>] (driver_probe_device+0x1e4/0x2b0) [<c0319ab0>] (driver_probe_device) from [<c03180d8>] (bus_for_each_drv+0x44/0x8c) [<c03180d8>] (bus_for_each_drv) from [<c0319840>] (__device_attach+0xa4/0x108) [<c0319840>] (__device_attach) from [<c0318f84>] (bus_probe_device+0x88/0x90) [<c0318f84>] (bus_probe_device) from [<c0319370>] (deferred_probe_work_func+0x64/0x94) [<c0319370>] (deferred_probe_work_func) from [<c002f290>] (process_one_work+0x1a4/0x49c) [<c002f290>] (process_one_work) from [<c002f5e8>] (worker_thread+0x28/0x468) [<c002f5e8>] (worker_thread) from [<c0034dbc>] (kthread+0xc0/0xdc) [<c0034dbc>] (kthread) from [<c000a2ec>] (ret_from_fork+0x14/0x28) mxs-sgtl5000 sound: sgtl5000 <-> 80042000.saif mapping ok

By inspecting the sgtl5000 codec driver I could not find where this "bad unlock balance" is happening.

Any ideas?

Thanks,

Fabio Estevam