Re: extcon-next regression ?

From: Felipe Balbi
Date: Wed Apr 23 2014 - 13:23:28 EST

Hi,

On Wed, Apr 23, 2014 at 11:40:33AM -0500, Felipe Balbi wrote:
> Hi Chanwoo,
>
> I've been testing extcon-next to make sure USB3 on OMAP5 will work out
> of the box but I see a regression when I merge your tree on top of
> v3.15-rc2 + Tony's DT fixes.
>
> Here's what I see (trimmed):
>
> [ 1.805870] palmas 0-0048: Muxing GPIO 2, PWM 0, LED 0
> [ 1.812516] ------------[ cut here ]------------
> [ 1.817387] WARNING: CPU: 0 PID: 6 at include/linux/kref.h:47 kobject_get+0x64/0x78()
> [ 1.817691] mmcblk0boot1: unknown partition table
> [ 1.830601] Modules linked in:
> [ 1.833827] CPU: 0 PID: 6 Comm: kworker/u4:0 Tainted: G W 3.15.0-rc2-00041-g3019b77 #308
> [ 1.843333] Workqueue: deferwq deferred_probe_work_func
> [ 1.848728] mmcblk0boot0: unknown partition table
> [ 1.853928] [<c0015110>] (unwind_backtrace) from [<c0011d6c>] (show_stack+0x10/0x14)
> [ 1.862086] [<c0011d6c>] (show_stack) from [<c05426b4>] (dump_stack+0x84/0x9c)
> [ 1.869667] [<c05426b4>] (dump_stack) from [<c0040928>] (warn_slowpath_common+0x6c/0x90)
> [ 1.878181] [<c0040928>] (warn_slowpath_common) from [<c00409e8>] (warn_slowpath_null+0x1c/0x24)
> [ 1.887421] [<c00409e8>] (warn_slowpath_null) from [<c02d50c4>] (kobject_get+0x64/0x78)
> [ 1.895837] [<c02d50c4>] (kobject_get) from [<c0350188>] (device_add+0x18/0x520)
> [ 1.903629] [<c0350188>] (device_add) from [<c0462a5c>] (extcon_dev_register+0x48/0x104)
> [ 1.912145] [<c0462a5c>] (extcon_dev_register) from [<c0462b44>] (devm_extcon_dev_register+0x2c/0x68)
> [ 1.921847] [<c0462b44>] (devm_extcon_dev_register) from [<c04630c0>] (palmas_usb_probe+0x110/0x304)
> [ 1.931453] [<c04630c0>] (palmas_usb_probe) from [<c0354284>] (platform_drv_probe+0x18/0x48)
> [ 1.940333] [<c0354284>] (platform_drv_probe) from [<c0352b0c>] (driver_probe_device+0x110/0x22c)
> [ 1.949664] [<c0352b0c>] (driver_probe_device) from [<c03511a0>] (bus_for_each_drv+0x58/0x8c)
> [ 1.958634] [<c03511a0>] (bus_for_each_drv) from [<c03529c8>] (device_attach+0x74/0x8c)
> [ 1.967003] [<c03529c8>] (device_attach) from [<c035206c>] (bus_probe_device+0x88/0xb0)
> [ 1.975387] [<c035206c>] (bus_probe_device) from [<c0350590>] (device_add+0x420/0x520)
> [ 1.983678] [<c0350590>] (device_add) from [<c045a310>] (of_platform_device_create_pdata+0x6c/0x8c)
> [ 1.993155] [<c045a310>] (of_platform_device_create_pdata) from [<c045a418>] (of_platform_bus_create+0xdc/0x168)
> [ 2.003818] [<c045a418>] (of_platform_bus_create) from [<c045a5cc>] (of_platform_populate+0x5c/0xa0)
> [ 2.013399] [<c045a5cc>] (of_platform_populate) from [<c0373c78>] (palmas_i2c_probe+0x30c/0x584)
> [ 2.022606] [<c0373c78>] (palmas_i2c_probe) from [<c0352b0c>] (driver_probe_device+0x110/0x22c)
> [ 2.031722] [<c0352b0c>] (driver_probe_device) from [<c03511a0>] (bus_for_each_drv+0x58/0x8c)
> [ 2.040715] [<c03511a0>] (bus_for_each_drv) from [<c03529c8>] (device_attach+0x74/0x8c)
> [ 2.049098] [<c03529c8>] (device_attach) from [<c035206c>] (bus_probe_device+0x88/0xb0)
> [ 2.057482] [<c035206c>] (bus_probe_device) from [<c0350590>] (device_add+0x420/0x520)
> [ 2.065774] [<c0350590>] (device_add) from [<c0424020>] (i2c_new_device+0x12c/0x18c)
> [ 2.073885] [<c0424020>] (i2c_new_device) from [<c0424980>] (i2c_register_adapter+0x278/0x498)
> [ 2.082903] [<c0424980>] (i2c_register_adapter) from [<c04275c0>] (omap_i2c_probe+0x4a4/0x6d0)
> [ 2.091925] [<c04275c0>] (omap_i2c_probe) from [<c0354284>] (platform_drv_probe+0x18/0x48)
> [ 2.100582] [<c0354284>] (platform_drv_probe) from [<c0352b0c>] (driver_probe_device+0x110/0x22c)
> [ 2.109883] [<c0352b0c>] (driver_probe_device) from [<c03511a0>] (bus_for_each_drv+0x58/0x8c)
> [ 2.118823] [<c03511a0>] (bus_for_each_drv) from [<c03529c8>] (device_attach+0x74/0x8c)
> [ 2.127194] [<c03529c8>] (device_attach) from [<c035206c>] (bus_probe_device+0x88/0xb0)
> [ 2.135584] [<c035206c>] (bus_probe_device) from [<c03524ac>] (deferred_probe_work_func+0x64/0x94)
> [ 2.144975] [<c03524ac>] (deferred_probe_work_func) from [<c0058c70>] (process_one_work+0x1ac/0x4cc)
> [ 2.154545] [<c0058c70>] (process_one_work) from [<c0059b10>] (worker_thread+0x114/0x3b4)
> [ 2.163119] [<c0059b10>] (worker_thread) from [<c005f6f0>] (kthread+0xd4/0xf0)
> [ 2.170695] [<c005f6f0>] (kthread) from [<c000e3c8>] (ret_from_fork+0x14/0x2c)
> [ 2.178259] ---[ end trace 3006de6450234d28 ]---
> [ 2.183081] kobject 'palmas_usb' (eca58c38): tried to add an uninitialized object, something is seriously wrong.
> [ 2.193731] CPU: 0 PID: 6 Comm: kworker/u4:0 Tainted: G W 3.15.0-rc2-00041-g3019b77 #308
> [ 2.203201] Workqueue: deferwq deferred_probe_work_func
> [ 2.208687] [<c0015110>] (unwind_backtrace) from [<c0011d6c>] (show_stack+0x10/0x14)
> [ 2.216789] [<c0011d6c>] (show_stack) from [<c05426b4>] (dump_stack+0x84/0x9c)
> [ 2.224357] [<c05426b4>] (dump_stack) from [<c02d5c28>] (kobject_add+0x88/0x98)
> [ 2.232014] [<c02d5c28>] (kobject_add) from [<c0350250>] (device_add+0xe0/0x520)
> [ 2.239758] [<c0350250>] (device_add) from [<c0462a5c>] (extcon_dev_register+0x48/0x104)
> [ 2.248235] [<c0462a5c>] (extcon_dev_register) from [<c0462b44>] (devm_extcon_dev_register+0x2c/0x68)
> [ 2.257901] [<c0462b44>] (devm_extcon_dev_register) from [<c04630c0>] (palmas_usb_probe+0x110/0x304)
> [ 2.267467] [<c04630c0>] (palmas_usb_probe) from [<c0354284>] (platform_drv_probe+0x18/0x48)
> [ 2.276298] [<c0354284>] (platform_drv_probe) from [<c0352b0c>] (driver_probe_device+0x110/0x22c)
> [ 2.285591] [<c0352b0c>] (driver_probe_device) from [<c03511a0>] (bus_for_each_drv+0x58/0x8c)
> [ 2.294520] [<c03511a0>] (bus_for_each_drv) from [<c03529c8>] (device_attach+0x74/0x8c)
> [ 2.302905] [<c03529c8>] (device_attach) from [<c035206c>] (bus_probe_device+0x88/0xb0)
> [ 2.311286] [<c035206c>] (bus_probe_device) from [<c0350590>] (device_add+0x420/0x520)
> [ 2.319583] [<c0350590>] (device_add) from [<c045a310>] (of_platform_device_create_pdata+0x6c/0x8c)
> [ 2.329063] [<c045a310>] (of_platform_device_create_pdata) from [<c045a418>] (of_platform_bus_create+0xdc/0x168)
> [ 2.339725] [<c045a418>] (of_platform_bus_create) from [<c045a5cc>] (of_platform_populate+0x5c/0xa0)
> [ 2.349296] [<c045a5cc>] (of_platform_populate) from [<c0373c78>] (palmas_i2c_probe+0x30c/0x584)
> [ 2.358496] [<c0373c78>] (palmas_i2c_probe) from [<c0352b0c>] (driver_probe_device+0x110/0x22c)
> [ 2.367609] [<c0352b0c>] (driver_probe_device) from [<c03511a0>] (bus_for_each_drv+0x58/0x8c)
> [ 2.376523] [<c03511a0>] (bus_for_each_drv) from [<c03529c8>] (device_attach+0x74/0x8c)
> [ 2.384914] [<c03529c8>] (device_attach) from [<c035206c>] (bus_probe_device+0x88/0xb0)
> [ 2.393301] [<c035206c>] (bus_probe_device) from [<c0350590>] (device_add+0x420/0x520)
> [ 2.401601] [<c0350590>] (device_add) from [<c0424020>] (i2c_new_device+0x12c/0x18c)
> [ 2.409707] [<c0424020>] (i2c_new_device) from [<c0424980>] (i2c_register_adapter+0x278/0x498)
> [ 2.418727] [<c0424980>] (i2c_register_adapter) from [<c04275c0>] (omap_i2c_probe+0x4a4/0x6d0)
> [ 2.427741] [<c04275c0>] (omap_i2c_probe) from [<c0354284>] (platform_drv_probe+0x18/0x48)
> [ 2.436382] [<c0354284>] (platform_drv_probe) from [<c0352b0c>] (driver_probe_device+0x110/0x22c)
> [ 2.445680] [<c0352b0c>] (driver_probe_device) from [<c03511a0>] (bus_for_each_drv+0x58/0x8c)
> [ 2.454613] [<c03511a0>] (bus_for_each_drv) from [<c03529c8>] (device_attach+0x74/0x8c)
> [ 2.463001] [<c03529c8>] (device_attach) from [<c035206c>] (bus_probe_device+0x88/0xb0)
> [ 2.471385] [<c035206c>] (bus_probe_device) from [<c03524ac>] (deferred_probe_work_func+0x64/0x94)
> [ 2.480772] [<c03524ac>] (deferred_probe_work_func) from [<c0058c70>] (process_one_work+0x1ac/0x4cc)
> [ 2.490339] [<c0058c70>] (process_one_work) from [<c0059b10>] (worker_thread+0x114/0x3b4)
> [ 2.498906] [<c0059b10>] (worker_thread) from [<c005f6f0>] (kthread+0xd4/0xf0)
> [ 2.506460] [<c005f6f0>] (kthread) from [<c000e3c8>] (ret_from_fork+0x14/0x2c)
> [ 2.514023] ------------[ cut here ]------------
> [ 2.518870] WARNING: CPU: 0 PID: 6 at lib/kobject.c:670 kobject_put+0x80/0x90()
> [ 2.526514] kobject: 'palmas_usb' (eca58c38): is not initialized, yet kobject_put() is being called.
> [ 2.536076] Modules linked in:
> [ 2.539287] CPU: 0 PID: 6 Comm: kworker/u4:0 Tainted: G W 3.15.0-rc2-00041-g3019b77 #308
> [ 2.548753] Workqueue: deferwq deferred_probe_work_func
> [ 2.554223] [<c0015110>] (unwind_backtrace) from [<c0011d6c>] (show_stack+0x10/0x14)
> [ 2.562341] [<c0011d6c>] (show_stack) from [<c05426b4>] (dump_stack+0x84/0x9c)
> [ 2.569911] [<c05426b4>] (dump_stack) from [<c0040928>] (warn_slowpath_common+0x6c/0x90)
> [ 2.578391] [<c0040928>] (warn_slowpath_common) from [<c004097c>] (warn_slowpath_fmt+0x30/0x40)
> [ 2.587502] [<c004097c>] (warn_slowpath_fmt) from [<c02d5158>] (kobject_put+0x80/0x90)
> [ 2.595780] [<c02d5158>] (kobject_put) from [<c03502fc>] (device_add+0x18c/0x520)
> [ 2.603623] [<c03502fc>] (device_add) from [<c0462a5c>] (extcon_dev_register+0x48/0x104)
> [ 2.612103] [<c0462a5c>] (extcon_dev_register) from [<c0462b44>] (devm_extcon_dev_register+0x2c/0x68)
> [ 2.621762] [<c0462b44>] (devm_extcon_dev_register) from [<c04630c0>] (palmas_usb_probe+0x110/0x304)
> [ 2.631321] [<c04630c0>] (palmas_usb_probe) from [<c0354284>] (platform_drv_probe+0x18/0x48)
> [ 2.640161] [<c0354284>] (platform_drv_probe) from [<c0352b0c>] (driver_probe_device+0x110/0x22c)
> [ 2.649447] [<c0352b0c>] (driver_probe_device) from [<c03511a0>] (bus_for_each_drv+0x58/0x8c)
> [ 2.658386] [<c03511a0>] (bus_for_each_drv) from [<c03529c8>] (device_attach+0x74/0x8c)
> [ 2.666757] [<c03529c8>] (device_attach) from [<c035206c>] (bus_probe_device+0x88/0xb0)
> [ 2.675144] [<c035206c>] (bus_probe_device) from [<c0350590>] (device_add+0x420/0x520)
> [ 2.683441] [<c0350590>] (device_add) from [<c045a310>] (of_platform_device_create_pdata+0x6c/0x8c)
> [ 2.692921] [<c045a310>] (of_platform_device_create_pdata) from [<c045a418>] (of_platform_bus_create+0xdc/0x168)
> [ 2.703575] [<c045a418>] (of_platform_bus_create) from [<c045a5cc>] (of_platform_populate+0x5c/0xa0)
> [ 2.713139] [<c045a5cc>] (of_platform_populate) from [<c0373c78>] (palmas_i2c_probe+0x30c/0x584)
> [ 2.722341] [<c0373c78>] (palmas_i2c_probe) from [<c0352b0c>] (driver_probe_device+0x110/0x22c)
> [ 2.731457] [<c0352b0c>] (driver_probe_device) from [<c03511a0>] (bus_for_each_drv+0x58/0x8c)
> [ 2.740380] [<c03511a0>] (bus_for_each_drv) from [<c03529c8>] (device_attach+0x74/0x8c)
> [ 2.748764] [<c03529c8>] (device_attach) from [<c035206c>] (bus_probe_device+0x88/0xb0)
> [ 2.757135] [<c035206c>] (bus_probe_device) from [<c0350590>] (device_add+0x420/0x520)
> [ 2.765429] [<c0350590>] (device_add) from [<c0424020>] (i2c_new_device+0x12c/0x18c)
> [ 2.773549] [<c0424020>] (i2c_new_device) from [<c0424980>] (i2c_register_adapter+0x278/0x498)
> [ 2.782576] [<c0424980>] (i2c_register_adapter) from [<c04275c0>] (omap_i2c_probe+0x4a4/0x6d0)
> [ 2.791597] [<c04275c0>] (omap_i2c_probe) from [<c0354284>] (platform_drv_probe+0x18/0x48)
> [ 2.800261] [<c0354284>] (platform_drv_probe) from [<c0352b0c>] (driver_probe_device+0x110/0x22c)
> [ 2.809560] [<c0352b0c>] (driver_probe_device) from [<c03511a0>] (bus_for_each_drv+0x58/0x8c)
> [ 2.818489] [<c03511a0>] (bus_for_each_drv) from [<c03529c8>] (device_attach+0x74/0x8c)
> [ 2.826865] [<c03529c8>] (device_attach) from [<c035206c>] (bus_probe_device+0x88/0xb0)
> [ 2.835253] [<c035206c>] (bus_probe_device) from [<c03524ac>] (deferred_probe_work_func+0x64/0x94)
> [ 2.844637] [<c03524ac>] (deferred_probe_work_func) from [<c0058c70>] (process_one_work+0x1ac/0x4cc)
> [ 2.854205] [<c0058c70>] (process_one_work) from [<c0059b10>] (worker_thread+0x114/0x3b4)
> [ 2.862778] [<c0059b10>] (worker_thread) from [<c005f6f0>] (kthread+0xd4/0xf0)
> [ 2.870349] [<c005f6f0>] (kthread) from [<c000e3c8>] (ret_from_fork+0x14/0x2c)
> [ 2.877911] ---[ end trace 3006de6450234d29 ]---
> [ 2.882734] ------------[ cut here ]------------
> [ 2.887573] WARNING: CPU: 0 PID: 6 at lib/kobject.c:670 kobject_put+0x80/0x90()
> [ 2.895209] kobject: 'palmas_usb' (eca58c38): is not initialized, yet kobject_put() is being called.
> [ 2.904765] Modules linked in:
> [ 2.907971] CPU: 0 PID: 6 Comm: kworker/u4:0 Tainted: G W 3.15.0-rc2-00041-g3019b77 #308
> [ 2.917447] Workqueue: deferwq deferred_probe_work_func
> [ 2.922924] [<c0015110>] (unwind_backtrace) from [<c0011d6c>] (show_stack+0x10/0x14)
> [ 2.931033] [<c0011d6c>] (show_stack) from [<c05426b4>] (dump_stack+0x84/0x9c)
> [ 2.938606] [<c05426b4>] (dump_stack) from [<c0040928>] (warn_slowpath_common+0x6c/0x90)
> [ 2.947069] [<c0040928>] (warn_slowpath_common) from [<c004097c>] (warn_slowpath_fmt+0x30/0x40)
> [ 2.956187] [<c004097c>] (warn_slowpath_fmt) from [<c02d5158>] (kobject_put+0x80/0x90)
> [ 2.964483] [<c02d5158>] (kobject_put) from [<c0462abc>] (extcon_dev_register+0xa8/0x104)
> [ 2.973053] [<c0462abc>] (extcon_dev_register) from [<c0462b44>] (devm_extcon_dev_register+0x2c/0x68)
> [ 2.982718] [<c0462b44>] (devm_extcon_dev_register) from [<c04630c0>] (palmas_usb_probe+0x110/0x304)
> [ 2.992285] [<c04630c0>] (palmas_usb_probe) from [<c0354284>] (platform_drv_probe+0x18/0x48)
> [ 3.001124] [<c0354284>] (platform_drv_probe) from [<c0352b0c>] (driver_probe_device+0x110/0x22c)
> [ 3.010423] [<c0352b0c>] (driver_probe_device) from [<c03511a0>] (bus_for_each_drv+0x58/0x8c)
> [ 3.019358] [<c03511a0>] (bus_for_each_drv) from [<c03529c8>] (device_attach+0x74/0x8c)
> [ 3.027746] [<c03529c8>] (device_attach) from [<c035206c>] (bus_probe_device+0x88/0xb0)
> [ 3.036121] [<c035206c>] (bus_probe_device) from [<c0350590>] (device_add+0x420/0x520)
> [ 3.044418] [<c0350590>] (device_add) from [<c045a310>] (of_platform_device_create_pdata+0x6c/0x8c)
> [ 3.053893] [<c045a310>] (of_platform_device_create_pdata) from [<c045a418>] (of_platform_bus_create+0xdc/0x168)
> [ 3.064550] [<c045a418>] (of_platform_bus_create) from [<c045a5cc>] (of_platform_populate+0x5c/0xa0)
> [ 3.074124] [<c045a5cc>] (of_platform_populate) from [<c0373c78>] (palmas_i2c_probe+0x30c/0x584)
> [ 3.083338] [<c0373c78>] (palmas_i2c_probe) from [<c0352b0c>] (driver_probe_device+0x110/0x22c)
> [ 3.092447] [<c0352b0c>] (driver_probe_device) from [<c03511a0>] (bus_for_each_drv+0x58/0x8c)
> [ 3.101381] [<c03511a0>] (bus_for_each_drv) from [<c03529c8>] (device_attach+0x74/0x8c)
> [ 3.109767] [<c03529c8>] (device_attach) from [<c035206c>] (bus_probe_device+0x88/0xb0)
> [ 3.118147] [<c035206c>] (bus_probe_device) from [<c0350590>] (device_add+0x420/0x520)
> [ 3.126432] [<c0350590>] (device_add) from [<c0424020>] (i2c_new_device+0x12c/0x18c)
> [ 3.134547] [<c0424020>] (i2c_new_device) from [<c0424980>] (i2c_register_adapter+0x278/0x498)
> [ 3.143569] [<c0424980>] (i2c_register_adapter) from [<c04275c0>] (omap_i2c_probe+0x4a4/0x6d0)
> [ 3.152593] [<c04275c0>] (omap_i2c_probe) from [<c0354284>] (platform_drv_probe+0x18/0x48)
> [ 3.161249] [<c0354284>] (platform_drv_probe) from [<c0352b0c>] (driver_probe_device+0x110/0x22c)
> [ 3.170537] [<c0352b0c>] (driver_probe_device) from [<c03511a0>] (bus_for_each_drv+0x58/0x8c)
> [ 3.179472] [<c03511a0>] (bus_for_each_drv) from [<c03529c8>] (device_attach+0x74/0x8c)
> [ 3.187854] [<c03529c8>] (device_attach) from [<c035206c>] (bus_probe_device+0x88/0xb0)
> [ 3.196222] [<c035206c>] (bus_probe_device) from [<c03524ac>] (deferred_probe_work_func+0x64/0x94)
> [ 3.205611] [<c03524ac>] (deferred_probe_work_func) from [<c0058c70>] (process_one_work+0x1ac/0x4cc)
> [ 3.215174] [<c0058c70>] (process_one_work) from [<c0059b10>] (worker_thread+0x114/0x3b4)
> [ 3.223739] [<c0059b10>] (worker_thread) from [<c005f6f0>] (kthread+0xd4/0xf0)
> [ 3.231313] [<c005f6f0>] (kthread) from [<c000e3c8>] (ret_from_fork+0x14/0x2c)
> [ 3.238883] ---[ end trace 3006de6450234d2a ]---
> [ 3.243711] palmas-usb palmas_usb.7: failed to register extcon device
> [ 3.250493] palmas-usb: probe of palmas_usb.7 failed with error -22
>
> Any ideas ??

bisected down to:

commit 854b85057cc6b90a326b731174b6c6dbbf34222a
Author: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
Date: Mon Apr 21 19:46:51 2014 +0900

extcon: Add extcon_dev_allocate/free() to control the memory of extcon device

This patch add APIs to control the extcon device on extcon provider driver.
The extcon_dev_allocate() allocates the memory of extcon device and initializes
supported cables. And then extcon_dev_free() decrement the reference of the
device of extcon device and free the memory of the extcon device. This APIs
must need to implement devm_extcon_dev_allocate()/free() APIs.

Signed-off-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>

diff --git a/drivers/extcon/extcon-class.c b/drivers/extcon/extcon-class.c
index f6df689..3e485bc 100644
--- a/drivers/extcon/extcon-class.c
+++ b/drivers/extcon/extcon-class.c
@@ -558,6 +558,9 @@ static int create_extcon_class(void)

static void extcon_dev_release(struct device *dev)
{
+ struct extcon_dev *edev = dev_to_extcon_dev(dev);
+
+ kfree(edev);
}

static const char *muex_name = "mutually_exclusive";
@@ -576,7 +579,7 @@ static void dummy_sysfs_dev_release(struct device *dev)
*/
int extcon_dev_register(struct extcon_dev *edev)
{
- int ret, index = 0;
+ int ret;

if (!extcon_class) {
ret = create_extcon_class();
@@ -584,80 +587,150 @@ int extcon_dev_register(struct extcon_dev *edev)
return ret;
}

- if (edev->supported_cable) {
- /* Get size of array */
- for (index = 0; edev->supported_cable[index]; index++)
- ;
- edev->max_supported = index;
- } else {
- edev->max_supported = 0;
+ edev->name = edev->name ? edev->name : dev_name(edev->dev.parent);
+ if (IS_ERR_OR_NULL(edev->name)) {
+ dev_err(&edev->dev, "extcon device name is null\n");
+ return -EINVAL;
}
+ dev_set_name(&edev->dev, "%s", edev->name);

- if (index > SUPPORTED_CABLE_MAX) {
- dev_err(&edev->dev, "extcon: maximum number of supported cables exceeded.\n");
- return -EINVAL;
+ ret = device_add(&edev->dev);
+ if (ret) {
+ put_device(&edev->dev);
+ return ret;
}
+#if defined(CONFIG_ANDROID)
+ if (switch_class)
+ ret = class_compat_create_link(switch_class, &edev->dev, NULL);
+#endif /* CONFIG_ANDROID */

- edev->dev.class = extcon_class;
- edev->dev.release = extcon_dev_release;
+ RAW_INIT_NOTIFIER_HEAD(&edev->nh);

- edev->name = edev->name ? edev->name : dev_name(edev->dev.parent);
- if (IS_ERR_OR_NULL(edev->name)) {
- dev_err(&edev->dev,
- "extcon device name is null\n");
- return -EINVAL;
+ dev_set_drvdata(&edev->dev, edev);
+ edev->state = 0;
+
+ mutex_lock(&extcon_dev_list_lock);
+ list_add(&edev->entry, &extcon_dev_list);
+ mutex_unlock(&extcon_dev_list_lock);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(extcon_dev_register);
+
+/**
+ * extcon_dev_unregister() - Unregister the extcon device.
+ * @edev: the extcon device instance to be unregistered.
+ */
+void extcon_dev_unregister(struct extcon_dev *edev)
+{
+ mutex_lock(&extcon_dev_list_lock);
+ list_del(&edev->entry);
+ mutex_unlock(&extcon_dev_list_lock);
+
+ if (IS_ERR_OR_NULL(get_device(&edev->dev))) {
+ dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n",
+ dev_name(&edev->dev));
+ return;
}
- dev_set_name(&edev->dev, "%s", edev->name);

- if (edev->max_supported) {
- char buf[10];
- char *str;
- struct extcon_cable *cable;
+ device_unregister(&edev->dev);

- edev->cables = kzalloc(sizeof(struct extcon_cable) *
- edev->max_supported, GFP_KERNEL);
- if (!edev->cables) {
+#if defined(CONFIG_ANDROID)
+ if (switch_class)
+ class_compat_remove_link(switch_class, &edev->dev, NULL);
+#endif
+}
+EXPORT_SYMBOL_GPL(extcon_dev_unregister);
+
+/*
+ * extcon_dev_allocate() - Allocate the memory of extcon device.
+ * @supported_cable: Array of supported cable names ending with NULL.
+ * If supported_cable is NULL, cable name related APIs
+ * are disabled.
+ *
+ * This function allocates the memory for extcon device without allocating
+ * memory in each extcon provider driver and initialize default setting for
+ * extcon device.
+ *
+ * Return the pointer of extcon device if success or ERR_PTR(err) if fail
+ */
+struct extcon_dev *extcon_dev_allocate(const char **supported_cable)
+{
+ struct extcon_dev *edev;
+ int index, ret, count = 0;
+
+ edev = kzalloc(sizeof(*edev), GFP_KERNEL);
+ if (!edev) {
+ pr_err("Failed to allocate the memory for extcon device\n");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ edev->max_supported = 0;
+ edev->supported_cable = supported_cable;
+ if (edev->supported_cable) {
+ for (count = 0; edev->supported_cable[count]; count++)
+ ;
+ edev->max_supported = count;
+ if (count > SUPPORTED_CABLE_MAX) {
+ pr_err("Exceed max number of supported cables\n");
ret = -ENOMEM;
- goto err_sysfs_alloc;
+ goto err;
}
- for (index = 0; index < edev->max_supported; index++) {
- cable = &edev->cables[index];
+ }

- snprintf(buf, 10, "cable.%d", index);
- str = kzalloc(sizeof(char) * (strlen(buf) + 1),
- GFP_KERNEL);
- if (!str) {
- for (index--; index >= 0; index--) {
- cable = &edev->cables[index];
- kfree(cable->attr_g.name);
- }
- ret = -ENOMEM;
+ edev->dev.class = extcon_class;
+ edev->dev.release = extcon_dev_release;
+ device_initialize(&edev->dev);
+ spin_lock_init(&edev->lock);
+
+ if (!edev->max_supported)
+ return 0;
+
+ edev->cables = kzalloc(sizeof(struct extcon_cable) *
+ edev->max_supported, GFP_KERNEL);
+ if (!edev->cables) {
+ ret = -ENOMEM;
+ goto err;
+ }

- goto err_alloc_cables;
+ for (index = 0; index < edev->max_supported; index++) {
+ struct extcon_cable *cable = &edev->cables[index];
+ char buf[10];
+ char *str;
+
+ snprintf(buf, 10, "cable.%d", index);
+ str = kzalloc(sizeof(char) * (strlen(buf) + 1),
+ GFP_KERNEL);
+ if (!str) {
+ for (index--; index >= 0; index--) {
+ cable = &edev->cables[index];
+ kfree(cable->attr_g.name);
}
- strcpy(str, buf);
-
- cable->edev = edev;
- cable->cable_index = index;
- cable->attrs[0] = &cable->attr_name.attr;
- cable->attrs[1] = &cable->attr_state.attr;
- cable->attrs[2] = NULL;
- cable->attr_g.name = str;
- cable->attr_g.attrs = cable->attrs;
-
- sysfs_attr_init(&cable->attr_name.attr);
- cable->attr_name.attr.name = "name";
- cable->attr_name.attr.mode = 0444;
- cable->attr_name.show = cable_name_show;
-
- sysfs_attr_init(&cable->attr_state.attr);
- cable->attr_state.attr.name = "state";
- cable->attr_state.attr.mode = 0444;
- cable->attr_state.show = cable_state_show;
+ ret = -ENOMEM;
+ goto err_alloc_cables;
}
+ strcpy(str, buf);
+
+ cable->edev = edev;
+ cable->cable_index = index;
+ cable->attrs[0] = &cable->attr_name.attr;
+ cable->attrs[1] = &cable->attr_state.attr;
+ cable->attrs[2] = NULL;
+ cable->attr_g.name = str;
+ cable->attr_g.attrs = cable->attrs;
+
+ sysfs_attr_init(&cable->attr_name.attr);
+ cable->attr_name.attr.name = "name";
+ cable->attr_name.attr.mode = 0444;
+ cable->attr_name.show = cable_name_show;
+
+ sysfs_attr_init(&cable->attr_state.attr);
+ cable->attr_state.attr.name = "state";
+ cable->attr_state.attr.mode = 0444;
+ cable->attr_state.show = cable_state_show;
}

- if (edev->max_supported && edev->mutually_exclusive) {
+ if (edev->mutually_exclusive) {
char buf[80];
char *name;

@@ -703,59 +776,32 @@ int extcon_dev_register(struct extcon_dev *edev)
}
edev->attr_g_muex.name = muex_name;
edev->attr_g_muex.attrs = edev->attrs_muex;
-
}

- if (edev->max_supported) {
- edev->extcon_dev_type.groups =
- kzalloc(sizeof(struct attribute_group *) *
- (edev->max_supported + 2), GFP_KERNEL);
- if (!edev->extcon_dev_type.groups) {
- ret = -ENOMEM;
- goto err_alloc_groups;
- }
-
- edev->extcon_dev_type.name = dev_name(&edev->dev);
- edev->extcon_dev_type.release = dummy_sysfs_dev_release;
-
- for (index = 0; index < edev->max_supported; index++)
- edev->extcon_dev_type.groups[index] =
- &edev->cables[index].attr_g;
- if (edev->mutually_exclusive)
- edev->extcon_dev_type.groups[index] =
- &edev->attr_g_muex;
-
- edev->dev.type = &edev->extcon_dev_type;
+ edev->extcon_dev_type.groups =
+ kzalloc(sizeof(struct attribute_group *) *
+ (edev->max_supported + 2), GFP_KERNEL);
+ if (!edev->extcon_dev_type.groups) {
+ ret = -ENOMEM;
+ goto err_alloc_groups;
}

- ret = device_register(&edev->dev);
- if (ret) {
- put_device(&edev->dev);
- goto err_dev;
- }
-#if defined(CONFIG_ANDROID)
- if (switch_class)
- ret = class_compat_create_link(switch_class, &edev->dev, NULL);
-#endif /* CONFIG_ANDROID */
-
- spin_lock_init(&edev->lock);
-
- RAW_INIT_NOTIFIER_HEAD(&edev->nh);
+ edev->extcon_dev_type.name = dev_name(&edev->dev);
+ edev->extcon_dev_type.release = dummy_sysfs_dev_release;

- dev_set_drvdata(&edev->dev, edev);
- edev->state = 0;
+ for (index = 0; index < edev->max_supported; index++)
+ edev->extcon_dev_type.groups[index] =
+ &edev->cables[index].attr_g;
+ if (edev->mutually_exclusive)
+ edev->extcon_dev_type.groups[index] =
+ &edev->attr_g_muex;

- mutex_lock(&extcon_dev_list_lock);
- list_add(&edev->entry, &extcon_dev_list);
- mutex_unlock(&extcon_dev_list_lock);
+ edev->dev.type = &edev->extcon_dev_type;

- return 0;
+ return edev;

-err_dev:
- if (edev->max_supported)
- kfree(edev->extcon_dev_type.groups);
err_alloc_groups:
- if (edev->max_supported && edev->mutually_exclusive) {
+ if (edev->mutually_exclusive) {
for (index = 0; edev->mutually_exclusive[index]; index++)
kfree(edev->d_attrs_muex[index].attr.name);
kfree(edev->d_attrs_muex);
@@ -765,36 +811,22 @@ err_muex:
for (index = 0; index < edev->max_supported; index++)
kfree(edev->cables[index].attr_g.name);
err_alloc_cables:
- if (edev->max_supported)
- kfree(edev->cables);
-err_sysfs_alloc:
- return ret;
+ kfree(edev->cables);
+err:
+ kfree(edev);
+
+ return ERR_PTR(ret);
}
-EXPORT_SYMBOL_GPL(extcon_dev_register);
+EXPORT_SYMBOL_GPL(extcon_dev_allocate);

-/**
- * extcon_dev_unregister() - Unregister the extcon device.
- * @edev: the extcon device instance to be unregistered.
- *
- * Note that this does not call kfree(edev) because edev was not allocated
- * by this class.
+/*
+ * extcon_dev_free() - Free the memory of extcon device.
+ * @edev: the extcon device to free
*/
-void extcon_dev_unregister(struct extcon_dev *edev)
+void extcon_dev_free(struct extcon_dev *edev)
{
int index;

- mutex_lock(&extcon_dev_list_lock);
- list_del(&edev->entry);
- mutex_unlock(&extcon_dev_list_lock);
-
- if (IS_ERR_OR_NULL(get_device(&edev->dev))) {
- dev_err(&edev->dev, "Failed to unregister extcon_dev (%s)\n",
- dev_name(&edev->dev));
- return;
- }
-
- device_unregister(&edev->dev);
-
if (edev->mutually_exclusive && edev->max_supported) {
for (index = 0; edev->mutually_exclusive[index];
index++)
@@ -811,13 +843,10 @@ void extcon_dev_unregister(struct extcon_dev *edev)
kfree(edev->cables);
}

-#if defined(CONFIG_ANDROID)
- if (switch_class)
- class_compat_remove_link(switch_class, &edev->dev, NULL);
-#endif
- put_device(&edev->dev);
+ if (edev)
+ put_device(&edev->dev);
}
-EXPORT_SYMBOL_GPL(extcon_dev_unregister);
+EXPORT_SYMBOL_GPL(extcon_dev_free);

static void devm_extcon_dev_unreg(struct device *dev, void *res)
{
diff --git a/include/linux/extcon.h b/include/linux/extcon.h
index 85a8a5b..20587ee 100644
--- a/include/linux/extcon.h
+++ b/include/linux/extcon.h
@@ -179,6 +179,8 @@ struct extcon_specific_cable_nb {

#if IS_ENABLED(CONFIG_EXTCON)

+#define dev_to_extcon_dev(d) container_of(d, struct extcon_dev, dev)
+
/*
* Following APIs are for notifiers or configurations.
* Notifiers are the external port and connection devices.
@@ -250,6 +252,12 @@ extern int extcon_unregister_notifier(struct extcon_dev *edev,
struct notifier_block *nb);

/*
+ * Following APIs control the memory of extcon device.
+ */
+extern struct extcon_dev *extcon_dev_allocate(const char **cables);
+extern void extcon_dev_free(struct extcon_dev *edev);
+
+/*
* Following API get the extcon device from devicetree.
* This function use phandle of devicetree to get extcon device directly.
*/
@@ -353,5 +361,12 @@ static inline struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev,
{
return ERR_PTR(-ENODEV);
}
+
+static inline struct extcon_dev *extcon_dev_allocate(const char **cables)
+{
+ return ERR_PTR(-ENOMEM);
+}
+
+static inline void extcon_dev_free(struct extcon_dev *edev) { }
#endif /* CONFIG_EXTCON */
#endif /* __LINUX_EXTCON_H__ */


here's full bisection log:

git bisect start
# good: [a798c10faf62a505d24e5f6213fbaf904a39623f] Linux 3.15-rc2
git bisect good a798c10faf62a505d24e5f6213fbaf904a39623f
# bad: [3019b77470c1f10b23438917f73cad386e4f7f02] Merge branch 'extcon-next' of git://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/extcon into merge
git bisect bad 3019b77470c1f10b23438917f73cad386e4f7f02
# bad: [f68f3aeb530b1efe3d6bf583db7a6255d15544eb] extcon: max14577: Use devm_extcon_dev_allocate for extcon_dev
git bisect bad f68f3aeb530b1efe3d6bf583db7a6255d15544eb
# good: [489096faca790b75653478d2f9d4774dd4f07b93] extcon: gpio: Use devm_extcon_dev_register()
git bisect good 489096faca790b75653478d2f9d4774dd4f07b93
# good: [5a451cded8793798e0d409e6ed6f8c53785ae929] extcon: arizona: Use devm_extcon_dev_register()
git bisect good 5a451cded8793798e0d409e6ed6f8c53785ae929
# bad: [cbe68e2d93df61fe40ddfea4d75f169fabadc155] extcon: Add devm_extcon_dev_allocate/free to manage the resource of extcon device
git bisect bad cbe68e2d93df61fe40ddfea4d75f169fabadc155
# bad: [854b85057cc6b90a326b731174b6c6dbbf34222a] extcon: Add extcon_dev_allocate/free() to control the memory of extcon device
git bisect bad 854b85057cc6b90a326b731174b6c6dbbf34222a
# first bad commit: [854b85057cc6b90a326b731174b6c6dbbf34222a] extcon: Add extcon_dev_allocate/free() to control the memory of extcon device

And the bug is very simple and affects *all* users of extcon class,
which tells me that this big series switching over to devm_* resources
wasn't tested at all. Originally extcon_dev_register() was calling
device_register(&edev->dev) which will call device_initialize(dev)
followed by device_add(dev).

After this commit, extcon_dev_register() now calls
device_add(&edev->dev) directly but never calls device_initialize()
anywhere. Was this *ever* tested anywhere ????? I suppose not!

Please fix that up ASAP.

cheers

--
balbi

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