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Wang, Xiaoming 7585ca0dc9 extcon: remove freed groups caused the panic or warning in unregister flow ... (edev->extcon_dev_type.groups) has been freed before device_unregister. extcon_dev_unregister -> kfree(edev->extcon_dev_type.groups) then device_unregister -> device_del -> device_remove_attrs -> device_remove_groups(dev, type->groups); panic because type->groups has been freed. This patch is move device_unregister ahead of groups free to avoid panic in extcon_dev_unregister. stack [ 22.847226] BUG: unable to handle kernel paging request at 5f39746e [ 22.847234] IP: [<c1387fcd>] sysfs_remove_group+0x2d/0xd0 [ 22.847238] *pdpt = 0000000000000000 *pde = 0000000000000000 [ 22.847241] Oops: 0000 [#1] PREEMPT SMP [ 22.847244] Modules linked in: [ 22.847249] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 3.10.16-261140-g6533774 #1 [ 22.847251] task: f3078000 ti: f3072000 task.ti: f3072000 [ 22.847254] EIP: 0060:[<c1387fcd>] EFLAGS: 00010206 CPU: 0 [ 22.847257] EIP is at sysfs_remove_group+0x2d/0xd0 [ 22.847259] EAX: 00000004 EBX: 5f39746e ECX: 00000000 EDX: f2773560 [ 22.847261] ESI: f2653b80 EDI: f2773560 EBP: f3073c90 ESP: f3073c70 [ 22.847263] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 [ 22.847264] CR0: 8005003b CR2: 5f39746e CR3: 020e5000 CR4: 001007f0 [ 22.847266] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 [ 22.847268] DR6: ffff0ff0 DR7: 00000400 [ 22.847269] Stack: [ 22.847276] c13848c9 c1ae3805 f3073c80 f24ddc4c 00000246 f2773e88 f1c44408 f2531340 [ 22.847283] f3073ca0 c16935ca f1c44400 f27d3340 f3073cb4 c1693858 f24ddc44 f1c44400 [ 22.847289] f1c4420c f3073cc8 c1693f76 f1c44400 00000001 00000000 f3073ce8 c1694011 [ 22.847290] Call Trace: [ 22.847295] [<c13848c9>] ? sysfs_hash_and_remove+0x49/0xa0 [ 22.847300] [<c1ae3805>] ? sub_preempt_count+0x55/0xe0 [ 22.847306] [<c16935ca>] device_remove_groups+0x2a/0x40 [ 22.847309] [<c1693858>] device_remove_attrs+0x38/0x60 [ 22.847313] [<c1693f76>] device_del+0xd6/0x150 [ 22.847316] [<c1694011>] device_unregister+0x21/0x60 [ 22.847320] [<c13869e8>] ? sysfs_remove_link+0x18/0x30 [ 22.847323] [<c1697d04>] ? class_compat_remove_link+0x34/0x50 [ 22.847329] [<c18bf5d9>] extcon_dev_unregister+0xf9/0x130 [ 22.847333] [<c18bd21f>] pwrsrc_extcon_dev_reg_callback+0x7f/0xa0 [ 22.847337] [<c1ae36e3>] notifier_call_chain+0x43/0x60 [ 22.847343] [<c12634e1>] __blocking_notifier_call_chain+0x41/0x80 [ 22.847347] [<c126353f>] blocking_notifier_call_chain+0x1f/0x30 [ 22.847351] [<c18bef39>] extcon_dev_notify_add_device+0x19/0x20 [ 22.847354] [<c18bf074>] extcon_dev_register+0x134/0x580 [ 22.847358] [<c1ae3805>] ? sub_preempt_count+0x55/0xe0 [ 22.847363] [<c154b4da>] ? gpiod_request+0x6a/0x1d0 [ 22.847368] [<c132528a>] ? kmem_cache_alloc_trace+0xaa/0x170 [ 22.847372] [<c18c0179>] ? fsa9285_probe+0x99/0x3f0 [ 22.847375] [<c18c00e0>] ? fsa9285_irq_handler+0xf0/0xf0 [ 22.847379] [<c18c019f>] fsa9285_probe+0xbf/0x3f0 [ 22.847383] [<c18c00e0>] ? fsa9285_irq_handler+0xf0/0xf0 [ 22.847388] [<c1828d9e>] i2c_device_probe+0x7e/0xf0 [ 22.847392] [<c1386e52>] ? sysfs_create_link+0x22/0x40 [ 22.847395] [<c1696c62>] ? driver_sysfs_add+0x72/0xa0 [ 22.847399] [<c1697119>] driver_probe_device+0x79/0x360 [ 22.847403] [<c1697491>] __driver_attach+0x91/0xa0 [ 22.847407] [<c1697400>] ? driver_probe_device+0x360/0x360 [ 22.847410] [<c16955a2>] bus_for_each_dev+0x42/0x80 [ 22.847414] [<c1696bee>] driver_attach+0x1e/0x20 [ 22.847417] [<c1697400>] ? driver_probe_device+0x360/0x360 [ 22.847420] [<c169675f>] bus_add_driver+0xef/0x270 [ 22.847425] [<c1828e10>] ? i2c_device_probe+0xf0/0xf0 [ 22.847428] [<c1828e10>] ? i2c_device_probe+0xf0/0xf0 [ 22.847432] [<c1697a8a>] driver_register+0x6a/0x160 [ 22.847436] [<c1addb3d>] ? mutex_unlock+0xd/0x10 [ 22.847440] [<c1438ab2>] ? __create_file+0x122/0x2a0 [ 22.847446] [<c20557d3>] ? extcon_class_init+0x15/0x15 [ 22.847450] [<c1827cbb>] i2c_register_driver+0x2b/0xd0 [ 22.847454] [<c1438d05>] ? debugfs_create_file+0x35/0x40 [ 22.847458] [<c20557d3>] ? extcon_class_init+0x15/0x15 [ 22.847461] [<c20557e4>] fsa9285_extcon_init+0x11/0x29 [ 22.847465] [<c12001aa>] do_one_initcall+0xba/0x170 [ 22.847471] [<c2012b4a>] kernel_init_freeable+0x119/0x1b8 [ 22.847475] [<c20124d3>] ? do_early_param+0x7a/0x7a [ 22.847480] [<c1ac4090>] kernel_init+0x10/0xd0 [ 22.847485] [<c1ae6cf7>] ret_from_kernel_thread+0x1b/0x28 [ 22.847488] [<c1ac4080>] ? rest_init+0x80/0x80 Tested-by: Liu, Chuansheng <chuansheng.liu@intel.com> Reviewed-by: Liu, Chuansheng <chuansheng.liu@intel.com> Signed-off-by: xiaoming wang <xiaoming.wang@intel.com> Signed-off-by: Zhang Dongxing <dongxing.zhang@intel.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>		11 years ago
..
Kconfig	extcon: Add an API to get extcon device from dt node	12 years ago
Makefile	extcon: Add an API to get extcon device from dt node	12 years ago
extcon-adc-jack.c	extcon: Simplify extcon_dev_register() prototype by removing unnecessary parameter	12 years ago
extcon-arizona.c	extcon: arizona: Get pdata from arizona structure not device	11 years ago
extcon-class.c	extcon: remove freed groups caused the panic or warning in unregister flow	11 years ago
extcon-gpio.c	extcon: Simplify extcon_dev_register() prototype by removing unnecessary parameter	12 years ago
extcon-max8997.c	Update extcon for 3.13	12 years ago
extcon-max77693.c	Update extcon for 3.13	12 years ago
extcon-palmas.c	extcon: Simplify extcon_dev_register() prototype by removing unnecessary parameter	12 years ago
of_extcon.c	extcon: Add an API to get extcon device from dt node	12 years ago