Hi Laurent, On 15/06/2020 02:57, Laurent Pinchart wrote: > Hello, > > This small patch series adds media controller support to the ti-cal > driver. I did some small testing on AM6, and after third module unload I got: [ 75.292797] OF: ERROR: Bad of_node_put() on /interconnect@100000/i2c@2010000/ov5640@3c/port/endpoint [ 75.292839] ------------[ cut here ]------------ [ 75.292849] refcount_t: addition on 0; use-after-free. [ 75.292856] WARNING: CPU: 0 PID: 421 at lib/refcount.c:25 refcount_warn_saturate+0xa0/0x148 [ 75.292861] Modules linked in: ov5640 ti_cal(-) tidss ti_tfp410 tc358767 display_connector phy_j721e_wiz phy_cadence_torrent panel_simple drm_kms_helper drm drm_panel_orienta tion_quirks cfbfillrect cfbimgblt cfbcopyarea [last unloaded: ov5640] [ 75.292935] CPU: 0 PID: 421 Comm: rmmod Not tainted 5.8.0-rc1-00107-g5de7cabe3995 #6 [ 75.292941] Hardware name: Texas Instruments AM654 Base Board (DT) [ 75.292946] pstate: 00000085 (nzcv daIf -PAN -UAO BTYPE=--) [ 75.292951] pc : refcount_warn_saturate+0xa0/0x148 [ 75.292956] lr : refcount_warn_saturate+0xa0/0x148 [ 75.292961] sp : ffff80001324f760 [ 75.292965] x29: ffff80001324f760 x28: ffff0a00ffffff05 [ 75.292978] x27: ffff800011f2731a x26: ffff800010e21c28 [ 75.292991] x25: ffff800010b6d468 x24: ffff00087ff30338 [ 75.293003] x23: ffff800011f276d8 x22: 0000000000000005 [ 75.293016] x21: 0000000000000005 x20: ffff800011f276d8 [ 75.293028] x19: ffff00087ff30378 x18: 0000000000000000 [ 75.293041] x17: 0000000000000000 x16: 0000000000000000 [ 75.293054] x15: 0000000000000004 x14: 0000000000048963 [ 75.293066] x13: 0000000000000000 x12: 0000000000000000 [ 75.293079] x11: ffff8000116e1540 x10: 0000000000000000 [ 75.293091] x9 : 000000006d17ab9f x8 : 612d657375203b30 [ 75.293104] x7 : 206e6f206e6f6974 x6 : ffff00087f823c12 [ 75.293116] x5 : 0000000000000000 x4 : ffff00087f823bb0 [ 75.293128] x3 : 0000000000000000 x2 : 0000000000000023 [ 75.293141] x1 : 2e76dc4eebb2b000 x0 : 0000000000000000 [ 75.293153] Call trace: [ 75.293158] refcount_warn_saturate+0xa0/0x148 [ 75.293163] kobject_get+0x40/0xb0 [ 75.293168] of_node_get+0x20/0x38 [ 75.293172] of_fwnode_get+0x34/0x58 [ 75.293177] fwnode_get_nth_parent+0x34/0x78 [ 75.293182] fwnode_full_name_string+0x4c/0xc8 [ 75.293187] device_node_string+0x318/0x3f0 [ 75.293192] pointer+0x204/0x2e0 [ 75.293196] vsnprintf+0x204/0x728 [ 75.293201] vscnprintf+0x30/0x68 [ 75.293206] vprintk_store+0x64/0x210 [ 75.293210] vprintk_emit+0xd4/0x340 [ 75.293215] vprintk_default+0x3c/0x48 [ 75.293219] vprintk_func+0xec/0x258 [ 75.293224] printk+0x60/0x84 [ 75.293229] of_node_release+0xcc/0xd8 [ 75.293233] kobject_put+0x8c/0x200 [ 75.293238] of_node_put+0x18/0x28 [ 75.293243] cal_camerarx_destroy+0x28/0x50 [ti_cal] [ 75.293247] cal_remove+0xa4/0x110 [ti_cal] [ 75.293252] platform_drv_remove+0x2c/0x50 [ 75.293257] device_release_driver_internal+0xfc/0x1d0 [ 75.293262] driver_detach+0x50/0xe0 [ 75.293267] bus_remove_driver+0x5c/0xd8 [ 75.293272] driver_unregister+0x30/0x60 [ 75.293276] platform_driver_unregister+0x14/0x20 [ 75.293281] cal_pdrv_exit+0x1c/0xb060 [ti_cal] [ 75.293286] __arm64_sys_delete_module+0x1a8/0x250 [ 75.293291] el0_svc_common.constprop.0+0x74/0x198 [ 75.293296] do_el0_svc+0x24/0x90 [ 75.293300] el0_sync_handler+0x9c/0x1b8 [ 75.293305] el0_sync+0x158/0x180 [ 75.293309] irq event stamp: 4884 [ 75.293315] hardirqs last enabled at (4883): [<ffff800010235b14>] slab_free_freelist_hook+0xf4/0x190 [ 75.293322] hardirqs last disabled at (4884): [<ffff8000100cf090>] vprintk_emit+0x88/0x340 [ 75.293328] softirqs last enabled at (4150): [<ffff800010000db8>] _stext+0x5b8/0x5fc [ 75.293333] softirqs last disabled at (4135): [<ffff800010047f7c>] irq_exit+0x114/0x128 [ 75.293339] ---[ end trace 3ee89555752a3b07 ]--- [ 75.293344] ------------[ cut here ]------------ [ 75.293349] refcount_t: underflow; use-after-free. [ 75.293356] WARNING: CPU: 0 PID: 421 at lib/refcount.c:28 refcount_warn_saturate+0xf4/0x148 [ 75.293360] Modules linked in: ov5640 ti_cal(-) tidss ti_tfp410 tc358767 display_connector phy_j721e_wiz phy_cadence_torrent panel_simple drm_kms_helper drm drm_panel_orienta tion_quirks cfbfillrect cfbimgblt cfbcopyarea [last unloaded: ov5640] [ 75.293433] CPU: 0 PID: 421 Comm: rmmod Tainted: G W 5.8.0-rc1-00107-g5de7cabe3995 #6 [ 75.293438] Hardware name: Texas Instruments AM654 Base Board (DT) [ 75.293443] pstate: 00000085 (nzcv daIf -PAN -UAO BTYPE=--) [ 75.293448] pc : refcount_warn_saturate+0xf4/0x148 [ 75.293453] lr : refcount_warn_saturate+0xf4/0x148 [ 75.293458] sp : ffff80001324f740 [ 75.293462] x29: ffff80001324f740 x28: ffff0a00ffffff05 [ 75.293475] x27: ffff800011f2731a x26: ffff800010e21c28 [ 75.293487] x25: ffff800010b6d468 x24: ffff00087ff30338 [ 75.293500] x23: ffff800011f276d8 x22: 0000000000000005 [ 75.293512] x21: 0000000000000005 x20: ffff00087ff30208 [ 75.293525] x19: ffff00087ff30378 x18: 0000000000000000 [ 75.293537] x17: 0000000000000000 x16: 0000000000000000 [ 75.293550] x15: 0000000000000004 x14: 0000000000048963 [ 75.293562] x13: 0000000000000000 x12: 0000000000000000 [ 75.293574] x11: ffff8000116e1540 x10: 0000000000000000 [ 75.293587] x9 : 000000006d17ab9f x8 : 72657466612d6573 [ 75.293600] x7 : 75203b776f6c6672 x6 : ffff00087f8246d1 [ 75.293612] x5 : 0000000000000000 x4 : ffff00087f823bb0 [ 75.293625] x3 : 0000000000000000 x2 : 0000000000000023 [ 75.293637] x1 : 2e76dc4eebb2b000 x0 : 0000000000000000 [ 75.293650] Call trace: [ 75.293655] refcount_warn_saturate+0xf4/0x148 [ 75.293659] kobject_put+0x140/0x200 [ 75.293664] of_node_put+0x18/0x28 [ 75.293668] of_fwnode_put+0x34/0x48 [ 75.293673] fwnode_get_next_parent+0x48/0x80 [ 75.293678] fwnode_get_nth_parent+0x4c/0x78 [ 75.293683] fwnode_full_name_string+0x4c/0xc8 [ 75.293688] device_node_string+0x318/0x3f0 [ 75.293693] pointer+0x204/0x2e0 [ 75.293697] vsnprintf+0x204/0x728 [ 75.293702] vscnprintf+0x30/0x68 [ 75.293706] vprintk_store+0x64/0x210 [ 75.293711] vprintk_emit+0xd4/0x340 [ 75.293715] vprintk_default+0x3c/0x48 [ 75.293720] vprintk_func+0xec/0x258 [ 75.293724] printk+0x60/0x84 [ 75.293729] of_node_release+0xcc/0xd8 [ 75.293734] kobject_put+0x8c/0x200 [ 75.293738] of_node_put+0x18/0x28 [ 75.293743] cal_camerarx_destroy+0x28/0x50 [ti_cal] [ 75.293748] cal_remove+0xa4/0x110 [ti_cal] [ 75.293753] platform_drv_remove+0x2c/0x50 [ 75.293758] device_release_driver_internal+0xfc/0x1d0 [ 75.293763] driver_detach+0x50/0xe0 [ 75.293768] bus_remove_driver+0x5c/0xd8 [ 75.293772] driver_unregister+0x30/0x60 [ 75.293777] platform_driver_unregister+0x14/0x20 [ 75.293782] cal_pdrv_exit+0x1c/0xb060 [ti_cal] [ 75.293787] __arm64_sys_delete_module+0x1a8/0x250 [ 75.293792] el0_svc_common.constprop.0+0x74/0x198 [ 75.293796] do_el0_svc+0x24/0x90 [ 75.293801] el0_sync_handler+0x9c/0x1b8 [ 75.293806] el0_sync+0x158/0x180 [ 75.293810] irq event stamp: 4884 [ 75.293816] hardirqs last enabled at (4883): [<ffff800010235b14>] slab_free_freelist_hook+0xf4/0x190 [ 75.293822] hardirqs last disabled at (4884): [<ffff8000100cf090>] vprintk_emit+0x88/0x340 [ 75.293828] softirqs last enabled at (4150): [<ffff800010000db8>] _stext+0x5b8/0x5fc [ 75.293834] softirqs last disabled at (4135): [<ffff800010047f7c>] irq_exit+0x114/0x128 [ 75.293839] ---[ end trace 3ee89555752a3b08 ]--- [ 75.293844] ------------[ cut here ]------------ [ 75.293849] refcount_t: saturated; leaking memory. [ 75.293855] WARNING: CPU: 0 PID: 421 at lib/refcount.c:22 refcount_warn_saturate+0x74/0x148 [ 75.293859] Modules linked in: ov5640 ti_cal(-) tidss ti_tfp410 tc358767 display_connector phy_j721e_wiz phy_cadence_torrent panel_simple drm_kms_helper drm drm_panel_orienta tion_quirks cfbfillrect cfbimgblt cfbcopyarea [last unloaded: ov5640] [ 75.293932] CPU: 0 PID: 421 Comm: rmmod Tainted: G W 5.8.0-rc1-00107-g5de7cabe3995 #6 [ 75.293938] Hardware name: Texas Instruments AM654 Base Board (DT) [ 75.293943] pstate: 00000085 (nzcv daIf -PAN -UAO BTYPE=--) [ 75.293948] pc : refcount_warn_saturate+0x74/0x148 [ 75.293952] lr : refcount_warn_saturate+0x74/0x148 [ 75.293957] sp : ffff80001324f760 [ 75.293961] x29: ffff80001324f760 x28: ffff0a00ffffff05 [ 75.293974] x27: ffff800011f2731a x26: ffff800010e21c28 [ 75.293986] x25: ffff800010b6d468 x24: ffff00087ff30338 [ 75.293999] x23: ffff800011f276d8 x22: 0000000000000004 [ 75.294011] x21: 0000000000000004 x20: ffff0000ffffff00 [ 75.294024] x19: ffff00087ff30378 x18: 0000000000000000 [ 75.294036] x17: 0000000000000000 x16: 0000000000000000 [ 75.294049] x15: 0000000000000004 x14: 0000000000048963 [ 75.294061] x13: 0000000000000000 x12: 0000000000000000 [ 75.294073] x11: ffff8000116e1540 x10: 0000000000000000 [ 75.294086] x9 : 00000000fffffffe x8 : 6c203b6465746172 [ 75.294098] x7 : 75746173203a745f x6 : ffff00087f8251c4 [ 75.294111] x5 : 0000000000000000 x4 : ffff00087f823bb0 [ 75.294123] x3 : 0000000000000000 x2 : 0000000000000023 [ 75.294136] x1 : 2e76dc4eebb2b000 x0 : 0000000000000000 [ 75.294148] Call trace: [ 75.294153] refcount_warn_saturate+0x74/0x148 [ 75.294157] kobject_get+0x78/0xb0 [ 75.294162] of_node_get+0x20/0x38 [ 75.294166] of_fwnode_get+0x34/0x58 [ 75.294171] fwnode_get_nth_parent+0x34/0x78 [ 75.294176] fwnode_full_name_string+0x4c/0xc8 [ 75.294181] device_node_string+0x318/0x3f0 [ 75.294186] pointer+0x204/0x2e0 [ 75.294190] vsnprintf+0x204/0x728 [ 75.294195] vscnprintf+0x30/0x68 [ 75.294199] vprintk_store+0x64/0x210 [ 75.294204] vprintk_emit+0xd4/0x340 [ 75.294208] vprintk_default+0x3c/0x48 [ 75.294213] vprintk_func+0xec/0x258 [ 75.294218] printk+0x60/0x84 [ 75.294222] of_node_release+0xcc/0xd8 [ 75.294227] kobject_put+0x8c/0x200 [ 75.294231] of_node_put+0x18/0x28 [ 75.294236] cal_camerarx_destroy+0x28/0x50 [ti_cal] [ 75.294241] cal_remove+0xa4/0x110 [ti_cal] [ 75.294246] platform_drv_remove+0x2c/0x50 [ 75.294251] device_release_driver_internal+0xfc/0x1d0 [ 75.294255] driver_detach+0x50/0xe0 [ 75.294260] bus_remove_driver+0x5c/0xd8 [ 75.294265] driver_unregister+0x30/0x60 [ 75.294270] platform_driver_unregister+0x14/0x20 [ 75.294275] cal_pdrv_exit+0x1c/0xb060 [ti_cal] [ 75.294280] __arm64_sys_delete_module+0x1a8/0x250 [ 75.294285] el0_svc_common.constprop.0+0x74/0x198 [ 75.294289] do_el0_svc+0x24/0x90 [ 75.294294] el0_sync_handler+0x9c/0x1b8 [ 75.294299] el0_sync+0x158/0x180 [ 75.294303] irq event stamp: 4884 [ 75.294309] hardirqs last enabled at (4883): [<ffff800010235b14>] slab_free_freelist_hook+0xf4/0x190 [ 75.294315] hardirqs last disabled at (4884): [<ffff8000100cf090>] vprintk_emit+0x88/0x340 [ 75.294320] softirqs last enabled [ 75.294329] Lost 2 message(s)! [ 76.258340] CPU: 1 PID: 421 Comm: rmmod Tainted: G W 5.8.0-rc1-00107-g5de7cabe3995 #6 [ 76.267490] Hardware name: Texas Instruments AM654 Base Board (DT) [ 76.273689] Call trace: [ 76.276160] dump_backtrace+0x0/0x1d8 [ 76.279843] show_stack+0x18/0x28 [ 76.283177] dump_stack+0xe4/0x150 [ 76.286596] of_node_release+0xd0/0xd8 [ 76.290360] kobject_put+0x8c/0x200 [ 76.293864] of_node_put+0x18/0x28 [ 76.297296] cal_camerarx_destroy+0x28/0x50 [ti_cal] [ 76.302283] cal_remove+0xa4/0x110 [ti_cal] [ 76.306484] platform_drv_remove+0x2c/0x50 [ 76.310597] device_release_driver_internal+0xfc/0x1d0 [ 76.315748] driver_detach+0x50/0xe0 [ 76.319338] bus_remove_driver+0x5c/0xd8 [ 76.323274] driver_unregister+0x30/0x60 [ 76.327211] platform_driver_unregister+0x14/0x20 [ 76.331936] cal_pdrv_exit+0x1c/0xb060 [ti_cal] [ 76.336483] __arm64_sys_delete_module+0x1a8/0x250 [ 76.341289] el0_svc_common.constprop.0+0x74/0x198 [ 76.346094] do_el0_svc+0x24/0x90 [ 76.349426] el0_sync_handler+0x9c/0x1b8 [ 76.353361] el0_sync+0x158/0x180 Tomi -- Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
