there is error log when plug in USB devices

[sunxiaohuix]

1. Plug in USBCamera
   root@edison:~# [ 278.106956] usb 1-1: device descriptor read/64, error -2
   [ 278.336938] usb 1-1: device descriptor read/64, error -2
   [ 278.686906] usb 1-1: device descriptor read/64, error -2
   [ 278.916866] usb 1-1: device descriptor read/64, error -2
   [ 284.336142] usb 1-1: 3:1: cannot get freq at ep 0x82
   [ 289.755399] usb 1-1: 3:1: cannot get freq at ep 0x82
2. Plug in USB Keyboard/Mouse
   root@edison:~# [ 439.064808] usb 1-1: device descriptor read/64, error -2
   [ 439.294775] usb 1-1: device descriptor read/64, error -2
   [ 439.644742] usb 1-1: device descriptor read/64, error -2
   [ 439.874712] usb 1-1: device descriptor read/64, error -2
3. Plug in USB disk
   [ 818.782606] usb 1-1: device descriptor read/64, error -2
   [ 819.012579] usb 1-1: device descriptor read/64, error -2
   [ 819.362556] usb 1-1: device descriptor read/64, error -2
   [ 819.592468] usb 1-1: device descriptor read/64, error -2
   [ 927.987582] usb 1-1: device descriptor read/64, error -2
   [ 928.217507] usb 1-1: device descriptor read/64, error -2
   [ 928.567485] usb 1-1: device descriptor read/64, error -2
   [ 928.797423] usb 1-1: device descriptor read/64, error -2
   [ 931.375815] sd 5:0:0:0: [sda] No Caching mode page found
   [ 931.375891] sd 5:0:0:0: [sda] Assuming drive cache: write throughs