USB3.0 Storage:Seagate FreeAgent USB 3.0 Portable Drive 500G USB3.0 Hub: LaCie USB 3.0 Hub Details: Call trace appeared after hot plug the usb3.0 hub and the machines cannot be done any operations except connecting by the ssh tools. This issue tested on the MBY06SDP/SKB-ULT/SKB-Mobile/SKB-Desktop platforms. Reproducible: always Steps to Reproduce: 1. Connect the usb3.0 devices. 2. Plug out the usb3.0 hub. Actual Results: Call Trace appeared after hot plug the usb3.0 hub. Expected Results: usb3.0 hub supports the hot plug. Additional info: 1. The xhci_hcd module is not loaded by default. 2. There is nothing info about the xhci host control after run the command "lspci -xxx -s xx:xx.x -v" 3. Call Trace info: Call Trace: [<ffffffff8138145e>] string.isra.4+0x3e/0xe0 [<ffffffff813824c9>] vsnprintf+0x219/0x600 [<ffffffff81380559>] ? put_dec+0x59/0x60 [<ffffffff81382971>] vscnprintf+0x11/0x30 [<ffffffff8103ab6a>] vprintk+0xea/0x520 [<ffffffff814ad95f>] ? __dev_printk+0x4f/0x90 [<ffffffff8176825a>] printk+0xa2/0xcc [<ffffffff814ad95f>] __dev_printk+0x4f/0x90 [<ffffffff814ad9f3>] _dev_info+0x53/0x60 [<ffffffff81586f70>] usb_disconnect+0x50/0x130 [<ffffffff81056f73>] ? __cancel_work_timer+0x83/0x130 [<ffffffff815870b2>] hub_quiesce+0x62/0xc0 [<ffffffff81587336>] hub_disconnect+0xc6/0x160 [<ffffffff81591223>] usb_unbind_interface+0x53/0x180 [<ffffffff814b0d4c>] __device_release_driver+0x7c/0xe0 [<ffffffff814b0ddc>] device_release_driver+0x2c/0x40 [<ffffffff814b07d1>] bus_remove_device+0xe1/0x120 [<ffffffff814ae30a>] device_del+0x12a/0x1c0 [<ffffffff8158ef9f>] usb_disable_device+0xaf/0x1f0 [<ffffffff81586fc0>] usb_disconnect+0xa0/0x130 [<ffffffff81588ad4>] hub_thread+0x374/0x1320 [<ffffffff8105ca00>] ? abort_exclusive_wait+0xb0/0xb0 [<ffffffff81588760>] ? usb_remote_wakeup+0x40/0x40 [<ffffffff8105bf43>] kthread+0x93/0xa0 [<ffffffff8177c354>] kernel_thread_helper+0x4/0x10 [<ffffffff8105beb0>] ? kthread_freezable_should_stop+0x70/0x70 [<ffffffff8177c350>] ? gs_change+0xb/0xb
1. configure --enable-kernel=standard --enable-rootfs=glibc-std-sato --enable-board=intel-xeon-core-haswell 2. make fs 3. on the board please plugin a usb3.0 hub, and then unplugin the hub
