suspend fail 的 stack backtrace -- usb serial driver

	usb 2-1: USB disconnect, address 2
	usb 2-1.3: USB disconnect, address 3
	irq 18: nobody cared (try booting with the "irqpoll" option)
	[<c009958c>] (unwind_backtrace+0x0/0xf0) from [<c00fcb64>] (__report_bad_irq+0x30/0x8c)
	[<c00fcb64>] (__report_bad_irq+0x30/0x8c) from [<c00fcd08>] (note_interrupt+0x148/0x1d0)
	[<c00fcd08>] (note_interrupt+0x148/0x1d0) from [<c00fd9a4>] (handle_level_irq+0xfc/0x188)
	[<c00fd9a4>] (handle_level_irq+0xfc/0x188) from [<c009406c>] (asm_do_IRQ+0x6c/0x8c)
	[<c009406c>] (asm_do_IRQ+0x6c/0x8c) from [<c0094a8c>] (__irq_svc+0x4c/0xcc)
	Exception stack(0xd918dd20 to 0xd918dd68)
	dd20: d911c960 d9649660 00000070 00000001 00000000 d97d34b0 d9649660 d9649660
	dd40: d921ae44 00000003 d921f600 00000000 00000074 d918dd68 c0181254 c021f644
	dd60: 60000113 ffffffff
	[<c0094a8c>] (__irq_svc+0x4c/0xcc) from [<c02x34) from [<c0181254>] (sysfs_find_dirent+0x38/0x58)
	[<c0181254>] (sysfs_find_dirent+0x38/0x58) from [<c0180038>] (sysfs_hash_and_remove+0x30/0x78)
	[<c0180038>] (sysfs_hash_and_remove+0x30/0x78) from [<c0261cb8>] (device_remove_class_symlinks+0x60/0x7c)
	[<c0261cb8>] (device_remove_class_symlinks+0x60/0x7c) from [<c0261f50>] (device_del+0x84/0x16c)
	[<c0261f50>] (device_del+0x84/0x16c) from [<c0262044>] (device_unregister+0xc/0x18)
	[<c0262044>] (device_unregister+0xc/0x18) from [<c026207c>] (device_destroy+0x2c/0x34)
	[<c026207c>] (device_destroy+0x2c/0x34) from [<c02ff080>] (usb_serial_device_remove+0x60/0x9c)
	[<c02ff080>] (usb_serial_device_remove+0x60/0x9c) from [<c0264150>] (__device_release_driver+0x84/0xd0)
	[<c0264150>] (__device_release_driver+0x84/0xd0) from [<c02642a0>] (device_release_driver+0x1c/0x28)
	[<c02642a0>] (device_release_driver+0x1c/0x28) from [<c02637cc>] (bus_remove_device+0xa4/0xb4)
	[<c02637cc>] (bus_remove_device+0xa4/0xb4) from [<c0261fdc>] (device_del+0x110/0x16c)
	[<c0261fdc>] (device_del+0x110/0x16c) from [<c02fcce8>] (usb_serial_disconnect+0xf4/0x15c)
	[<c02fcce8>] (usb_serial_disconnect+0xf4/0x15c) from [<c02e5170>] (usb_unbind_interface+0x50/0x110)
	[<c02e5170>] (usb_unbind_interface+0x50/0x110) from [<c0264150>] (__device_release_driver+0x84/0xd0)
	[<c0264150>] (__device_release_driver+0x84/0xd0) from [<c02642a0>] (device_release_driver+0x1c/0x28)
	[<c02642a0>] (device_release_driver+0x1c/0x28) from [<c02637cc>] (bus_remove_device+0xa4/0xb4)
	[<c02637cc>] (bus_remove_device+0xa4/0xb4) from [<c0261fdc>] (device_del+0x110/0x16c)
	[<c0261fdc>] (device_del+0x110/0x16c) from [<c02e295c>] (usb_disable_device+0xec/0x180)
	[<c02e295c>] (usb_disable_device+0xec/0x180) from [<c02dcf90>] (usb_disconnect+0xc0/0x170)
	[<c02dcf90>] (usb_disconnect+0xc0/0x170) from [<c02dcf5c>] (usb_disconnect+0x8c/0x170)
	[<c02dcf5c>] (usb_disconnect+0x8c/0x170) from [<c02de36c>] (hub_thread+0x5b4/0x118c)
	[<c02de36c>] (hub_thread+0x5b4/0x118c) from [<c00da9ac>] (kthread+0x78/0x80)
	[<c00da9ac>] (kthread+0x78/0x80) from [<c00959e0>] (kernel_thread_exit+0x0/0x8)
	handlers:
	[<c00b0184>] (usb_wakeup_handler+0x0/0xdc)
	[<c02d893c>] (fsl_otg_isr+0x0/0x114)
	[<c02dfa10>] (usb_hcd_irq+0x0/0x90)
	[<c03076e8>] (fsl_udc_irq+0x0/0xc84)
	Disabling IRQ #18

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