tiny210V2开发板使用usb摄像头（UVC，型号au321），点击USB应用程序，无法打开摄像头，无图像输出。
在我开启3.0.8的内核的dev_dbg调试以后，出现如下的打印信息：
擦入摄像头的时候，内核打印如下信息：
[root@FriendlyARM /]# //////////////////////////////////USB摄像头插入时的打印信息
[ 61.856481] hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0002 ////////////////由hub_events函数打印出来
[ 61.856545] s5p-ehci s5p-ehci:
[ 61.856591] hub 1-0:1.0: port 1, status 0501, change 0001, 480 Mb/s ////////由hub_port_connect_change打印出来
[ 61.980798] hub 1-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x501
[ 62.035681] s5p-ehci s5p-ehci: port 1 high speed
[ 62.035721] s5p-ehci s5p-ehci:
[ 62.090161] usb 1-1: new high speed USB device number 2 using s5p-ehci
[ 62.090312] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 1 //qh_completions函数打印出来的
[ 62.090432] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 2
[ 62.090556] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 3
[ 62.092181] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 4
[ 62.098056] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 5
[ 62.103932] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 6
[ 62.109806] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 7
[ 62.113] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 9
[ 62.127556] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 10
[ 62.133557] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 11
[ 62.139432] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 12
[ 62.145431] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 13
[ 62.151432] s5p-ehci 5p-ehci: detected XactErr len 0/8 retry 14
[ 62.157433] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 15
[ 62.163432] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 16
[ 62.169433] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 17
[ 62.175307] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 18
[ 62.181306] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 19
[ 62.187307] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 20
[ 62.193307] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 21
[ 62.199307] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 22
[ 62.205306] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 23
[ 62.211183] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 24
[ 62.217181] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 25
[ 62.223182] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 26
[ 62.229182] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 27
[ 62.235181] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 28
[ 62.241182] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 29
[ 62.247057] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 30
[ 62.253056] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 31
[ 62.259058] s5p-ehci s5p-ehci: devpath 1 ep0in 3strikes
[ 62.264432] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 1
[ 62.270182] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 2
[ 62.276058] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 3
[ 62.281931] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 4
[ 62.287807] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 5
[ 62.293682] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 6
[ 62.299682] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 7
[ 62.305558] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 8
[ 62.311433] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 9
[ 62.317306] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 10
[ 62.323308] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 11
[ 62.329307] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 12
[ 62.335181] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 13
[ 62.341185] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 14
[ 62.347183] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 15
[ 62.353184] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 16
[ 62.359187] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 17
[ 62.365186] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 18
[ 62.371058] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 19
[ 62.377058] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 20
[ 62.383060] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 21
[ 62.389060] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 22
[ 62.395059] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 23
[ 62.401056] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 24
[ 62.406931] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 25
[ 62.412935] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 26
[ 62.418932] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 27
[ 62.424931] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 28
[ 62.430932] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 29
[ 62.436932] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 30
[ 62.442807] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 31
[ 62.448807] s5p-ehci s5p-ehci: devpath 1 ep0in 3strikes
[ 62.454182] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 1
[ 62.459932] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 2
[ 62.465808] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 3
[ 62.471682] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 4
[ 62.477556] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 5
[ 62.483557] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 6
[ 62.489432] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 7
[ 62.495306] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 8
[ 62.501182] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 9
[ 62.507057] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 10
[ 62.513056] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 11
[ 62.519057] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 12
[ 62.525057] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 13
[ 62.531057] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 14
[ 62.536931] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 15
[ 62.542932] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 16
[ 62.548931] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 17
[ 62.554932] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 18
[ 62.560933] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 19
[ 62.566931] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 20
[ 62.572807] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 21
[ 62.578807] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 22
[ 62.584809] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 23
[ 62.590808] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 24
[ 62.596811] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 25
[ 62.602809] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 26
[ 62.608683] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 27
[ 62.614682] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 28
[ 62.620683] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 29
[ 62.626684] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 30
[ 62.632684] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 31
[ 62.638684] s5p-ehci s5p-ehci: devpath 1 ep0in 3strikes
[ 62.695808] s5p-ehci s5p-ehci: port 1 high speed
[ 62.695850] s5p-ehci s5p-ehci:
[ 62.695912] hub 1-0:1.0: unable to enumerate USB device on port 1 ///////////////准备更换端口 由hub_port_connect_change中打印出来，最后尾声阶段
[ 62.698861] s5p-ohci s5p-ohci: auto-wakeup root hub ////////////////////在ohci_rh_resume函数中被打印
[ 62.707355] hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0002 //////是由hub_events函数打印出来的信息
[ 62.707412] s5p-ehci s5p-ehci: 酤哇V
[ 62.707455] hub 1-0:1.0: port 1, status 0100, change 0001, 12 Mb/s ///////////////由hub_port_connect_change打印出来
[ 62.832345] hub 1-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x100
[ 62.832418] hub 2-0:1.0: state 7 ports 1 chg 0000 evt 0002
[ 62.832474] s5p-ohci s5p-ohci: GetStatus roothub.portstatus [0] = 0x00010101 CSC PPS CCS
[ 62.832559] hub 2-0:1.0: port 1, status 0101, change 0001, 12 Mb/s
[ 62.961258] hub 2-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x101
[ 63.031562] s5p-ohci s5p-ohci: GetStatus roothub.portstatus [0] = 0x00100103 PRSC PPS PES CCS
[ 63.086243] usb 2-1: new full speed USB device number 2 using s5p-ohci
[ 63.156584] s5p-ohci s5p-ohci: GetStatus roothub.portstatus [0] = 0x00100103 PRSC PPS PES CCS
[ 63.233931] usb 2-1: not running at top speed; connect to a high speed hub
[ 63.246937] usb 2-1: config index 0 descriptor too short (expected 271, got 251)/////////////usb_get_configuration打印输出信息
[ 63.247006] usb 2-1: skipped 1 descriptor after configuration ///////////////usb_parse_configuration打印出来，被usb_get_configuration调用
[ 63.247057] usb 2-1: skipped 5 descriptors after interface ///////////////usb_parse_interface打印出来
[ 63.247107] usb 2-1: skipped 1 descriptor after endpoint
[ 63.248520] usb 2-1: skipped 4 descriptors after interface
[ 63.254938] usb 2-1: default language 0x0409 ///////////usb_get_langid函数打印出来
[ 63.275938] usb 2-1: udev 2, busnum 2, minor = 129 //////////////////////////usb_new_device函数中打印出来的信息
[ 63.276630] usb 2-1: usb_probe_device //////usb_probe_device函数打印出来的信息
[ 63.276672] usb 2-1: configuration #1 chosen from 1 choice
[ 63.277964] usb 2-1: adding 2-1:1.0 (config #1, interface 0)
[ 63.282336] usbserial_generic 2-1:1.0: usb_probe_interface
[ 63.283189] usbserial_generic 2-1:1.0: usb_probe_interface - got id
[ 63.293751] uvcvideo 2-1:1.0: usb_probe_interface
[ 63.294097] uvcvideo 2-1:1.0: usb_probe_interface - got id
[ 63.299637] uvcvideo: Found UVC 1.00 device USB 2.0 Camera (058f:3821)
[ 63.316932] input: USB 2.0 Camera as /devices/platform/s5p-ohci/usb2/2-1/2-1:1.0/input/input3
[ 63.322318] usb 2-1: adding 2-1:1.1 (config #1, interface 1)
[ 63.333789] hub 2-0:1.0: state 7 ports 1 chg 0000 evt 0002
点击摄像头应用程序的时候，打印如下信息：
[root@FriendlyARM /]#///////////////////////点击USB摄像头打开时的输出信息
[ 113.418953] usb 2-1: tracer timed out on ep0in len=0/255 //////////usb_start_wait_urb打印出来的信息，表示255帧数据，一帧都未传输
[ 114.156515] hub 2-0:1.0: state 7 ports 1 chg 0000 evt 0002
[ 114.156579] s5p-ohci s5p-ohci: GetStatus roothub.portstatus [0] = 0x00030100 PESC CSC PPS ////由dbg_port在ohci_hub_control函数中调用以后打印出来的信息
[ 114.156662] hub 2-0:1.0: port 1, status 0100, change 0003, 12 Mb/s
[ 114.156717] usb 2-1: USB disconnect, device number 2
[ 114.158964] s5p-ohci s5p-ohci: urb db720200 path 1 ep0in 5fd60000 cc 5 --> status -62 /////////ed_halted函数打印出来的信息，（-62）表示Timer expired，定时器过期
[ 114.167167] uvcvideo: Failed to submit URB 0 (-19). /////////////////注意这条信息，它是在uvc_init_video的函数中打印出来的，（-19表示no such device）
[ 114.171628] usb 2-1: unregistering device
[ 114.178717] usb 2-1: unregistering interface 2-1:1.0
[ 114.180575] s5p-ohci s5p-ohci: urb db4adb00 path 1 ep1in 5c160000 cc 5 --> status -62
[ 114.188337] uvcvideo: Non-zero status (-62) in status completion handler.
[ 114.227181] usb 2-1: unregistering interface 2-1:1.1
[ 114.231032] usb 2-1: usb_disable_device nuking all URBs
[ 114.363597] hub 2-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x100
[ 114.363677] hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0002
[ 114.363735] s5p-ehci s5p-ehci: 酤哇V
[ 114.363778] hub 1-0:1.0: port 1, status 0501, change 0001, 480 Mb/s
[ 114.488610] hub 1-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x501
[ 114.543427] s5p-ehci s5p-ehci: port 1 high speed
[ 114.543468] s5p-ehci s5p-ehci:
[ 114.597964] usb 1-1: new high speed USB device number 3 using s5p-ehci
[ 114.652804] s5p-ehci s5p-ehci: port 1 high speed
[ 114.652847] s5p-ehci s5p-ehci:
[ 114.769078] usb 1-1: skipped 1 descriptor after configuration
[ 114.769131] usb 1-1: skipped 5 descriptors after interface
[ 114.769182] usb 1-1: skipped 1 descriptor after endpoint
[ 114.769229] usb 1-1: skipped 15 descriptors after interface
[ 114.769695] usb 1-1: default language 0x0409
[ 114.779695] usb 1-1: udev 3, busnum 1, minor = 2
[ 114.780397] usb 1-1: usb_probe_device
[ 114.781310] usb 1-1: configuration #1 chosen from 1 choice
[ 114.791977] usb 1-1: adding 1-1:1.0 (config #1, interface 0)
[ 114.794810] usbserial_generic 1-1:1.0: usb_probe_interface
[ 114.801122] usbserial_generic 1-1:1.0: usb_probe_interface - got id
[ 114.804355] uvcvideo 1-1:1.0: usb_probe_interface
[ 114.810109] uvcvideo 1-1:1.0: usb_probe_interface - got id
[ 114.814315] uvcvideo: Found UVC 1.00 device USB 2.0 Camera (058f:3821)
[ 114.830228] input: USB 2.0 Camera as /devices/platform/s5p-ehci/usb1/1-1/1-1:1.0/input/input4
[ 114.835213] usb 1-1: adding 1-1:1.1 (config #1, interface 1)
[ 114.926601] hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0002
[ 114.926667] s5p-ehci s5p-ehci: 酤哇V
[ 114.926713] hub 1-0:1.0: port 1, status 0100, change 0001, 12 Mb/s
[ 114.926769] usb 1-1: USB disconnect, device number 3
[ 114.926812] usb 1-1: unregistering device
[ 114.928442] usb 1-1: unregistering interface 1-1:1.0
[ 114.977119] usb 1-1: unregistering interface 1-1:1.1
[ 114.981951] usb 1-1: usb_disable_device nuking all URBs
[ 114.988885] s5p-ehci s5p-ehci: h
[ 115.113587] hub 1-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x501
[ 115.168426] s5p-ehci s5p-ehci: port 1 high speed
[ 115.168468] s5p-ehci s5p-ehci:
[ 115.222975] usb 1-1: new high speed USB device number 4 using s5p-ehci
[ 115.277801] s5p-ehci s5p-ehci: port 1 high speed
[ 115.277842] s5p-ehci s5p-ehci:
[ 115.371408] s5p-ohci s5p-ohci: auto-stop root hub
[ 115.394078] usb 1-1: skipped 1 descriptor after configuration
[ 115.394131] usb 1-1: skipped 5 descriptors after interface
[ 115.394181] usb 1-1: skipped 1 descriptor after endpoint
[ 115.394228] usb 1-1: skipped 15 descriptors after interface
[ 115.394695] usb 1-1: default language 0x0409
[ 115.405195] usb 1-1: udev 4, busnum 1, minor = 3
[ 115.405858] usb 1-1: usb_probe_device
[ 115.406313] usb 1-1: configuration #1 chosen from 1 choice
[ 115.416477] usb 1-1: adding 1-1:1.0 (config #1, interface 0)
[ 115.419822] usbserial_generic 1-1:1.0: usb_probe_interface
[ 115.426126] usbserial_generic 1-1:1.0: usb_probe_interface - got id
[ 115.429359] uvcvideo 1-1:1.0: usb_probe_interface
[ 115.434812] uvcvideo 1-1:1.0: usb_probe_interface - got id
[ 115.439310] uvcvideo: Found UVC 1.00 device USB 2.0 Camera (058f:3821)
[ 115.455305] input: USB 2.0 Camera as /devices/platform/s5p-ehci/usb1/1-1/1-1:1.0/input/input5
[ 115.460230] usb 1-1: adding 1-1:1.1 (config #1, interface 1)
[ 115.470766] hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0002
[ 115.725720] hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0002
[ 115.725783] s5p-ehci s5p-ehci: 酤哇V
[ 115.725828] hub 1-0:1.0: port 1, status 0100, change 0001, 12 Mb/s
[ 115.725884] usb 1-1: USB disconnect, device number 4
[ 115.725927] usb 1-1: unregistering device
[ 115.727577] usb 1-1: unregistering interface 1-1:1.0
[ 115.750547] usb 1-1: unregistering interface 1-1:1.1
[ 115.755391] usb 1-1: usb_disable_device nuking all URBs
[ 115.763142] s5p-ehci s5p-ehci: h
[ 115.887043] hub 1-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x501
[ 115.941928] s5p-ehci s5p-ehci: port 1 high speed
[ 115.941969] s5p-ehci s5p-ehci:
[ 115.996403] usb 1-1: new high speed USB device number 5 using s5p-ehci
[ 116.051300] s5p-ehci s5p-ehci: port 1 high speed
[ 116.051341] s5p-ehci s5p-ehci:
[ 116.105931] ...................////////打印重复信息
[ 116.633302] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 31
[ 116.639303] s5p-ehci s5p-ehci: devpath 1 ep0out 3strikes
[ 116.847963] usb 1-1: device not accepting address 5, error -71
[ 116.902799] s5p-ehci s5p-ehci: port 1 high speed
[ 116.902841] s5p-ehci s5p-ehci:
[ 116.957336] usb 1-1: new high speed USB device number 6 using s5p-ehci
[ 117.012175] s5p-ehci s5p-ehci: port 1 high speed
[ 117.012217] s5p-ehci s5p-ehci:
[ 117.128453] usb 1-1: skipped 1 descriptor after configuration
[ 117.128506] usb 1-1: skipped 5 descriptors after interface
[ 117.128556] usb 1-1: skipped 1 descriptor after endpoint
[ 117.128603] usb 1-1: skipped 15 descriptors after interface
[ 117.129070] usb 1-1: default language 0x0409
[ 117.139070] usb 1-1: udev 6, busnum 1, minor = 5
[ 117.139728] usb 1-1: usb_probe_device
[ 117.140689] usb 1-1: configuration #1 chosen from 1 choice
[ 117.150850] usb 1-1: adding 1-1:1.0 (config #1, interface 0)
[ 117.154205] usbserial_generic 1-1:1.0: usb_probe_interface
[ 117.160489] usbserial_generic 1-1:1.0: usb_probe_interface - got id
[ 117.163738] uvcvideo 1-1:1.0: usb_probe_interface
[ 117.169158] uvcvideo 1-1:1.0: usb_probe_interface - got id
[ 117.173680] uvcvideo: Found UVC 1.00 device USB 2.0 Camera (058f:3821)
[ 117.189549] input: USB 2.0 Camera as /devices/platform/s5p-ehci/usb1/1-1/1-1:1.0/input/input6
[ 117.194430] usb 1-1: adding 1-1:1.1 (config #1, interface 1)
[ 117.204960] hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0002
[ 117.212588] hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0002
[ 117.212650] s5p-ehci s5p-ehci: 酤哇V
[ 117.212695] hub 1-0:1.0: port 1, status 0100, change 0001, 12 Mb/s
[ 117.215038] usb 1-1: USB disconnect, device number 6
[ 117.220018] usb 1-1: unregistering device
[ 117.223979] usb 1-1: unregistering interface 1-1:1.0
[ 117.246658] usb 1-1: unregistering interface 1-1:1.1
[ 117.251482] usb 1-1: usb_disable_device nuking all URBs
[ 117.260557] s5p-ehci s5p-ehci: h
[ 117.383123] hub 1-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x501
[ 117.438053] s5p-ehci s5p-ehci: port 1 high speed
[ 117.438094] s5p-ehci s5p-ehci:
[ 117.492514] usb 1-1: new high speed USB device number 7 using s5p-ehci
[ 117.492684] ..........................///////打印重复信息
[ 118.035051] s5p-ehci s5p-ehci: detected XactErr len 0/8 retry 31
[ 118.040928] s5p-ehci s5p-ehci: devpath 1 ep0in 3strikes
[ 118.098176] s5p-ehci s5p-ehci: port 1 high speed
[ 118.098218] s5p-ehci s5p-ehci:
[ 118.098277] hub 1-0:1.0: unable to enumerate USB device on port 1/////////////////
[ 118.101227] s5p-ohci s5p-ohci: auto-wakeup root hub
[ 118.109672] hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0002
[ 118.109730] s5p-ehci s5p-ehci: 酤哇V
[ 118.109773] hub 1-0:1.0: port 1, status 0100, change 0001, 12 Mb/s
[ 118.234689] hub 1-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x100
[ 118.234761] hub 2-0:1.0: state 7 ports 1 chg 0000 evt 0002
[ 118.234816] s5p-ohci s5p-ohci: GetStatus roothub.portstatus [0] = 0x00010101 CSC PPS CCS
[ 118.234901] hub 2-0:1.0: port 1, status 0101, change 0001, 12 Mb/s
[ 118.363577] hub 2-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x101
[ 118.433907] s5p-ohci s5p-ohci: GetStatus roothub.portstatus [0] = 0x00100103 PRSC PPS PES CCS
[ 118.488596] usb 2-1: new full speed USB device number 3 using s5p-ohci
[ 118.558895] s5p-ohci s5p-ohci: GetStatus roothub.portstatus [0] = 0x00100103 PRSC PPS PES CCS
[ 118.636298] usb 2-1: not running at top speed; connect to a high speed hub
[ 118.650302] usb 2-1: config index 0 descriptor too short (expected 271, got 251)////////确定由usb_get_configuration函数打印出来
[ 118.650371] usb 2-1: skipped 1 descriptor after configuration
[ 118.650422] usb 2-1: skipped 5 descriptors after interface
[ 118.650472] usb 2-1: skipped 1 descriptor after endpoint
[ 118.651884] usb 2-1: skipped 4 desriptors after interface
[ 118.658302] usb 2-1: default language 0x0409
[ 118.679301] usb 2-1: udev 3, busnum 2, minor = 130
[ 118.680019] usb 2-1: usb_probe_device
[ 118.680060] usb 2-1: configuration #1 chosen from 1 choice
[ 118.681336] usb 2-1: adding 2-1:1.0 (config #1, interface 0)
[ 118.685339] usbserial_generic 2-1:1.0: usb_probe_interface
[ 118.686540] usbserial_generic 2-1:1.0: usb_probe_interface - got id
[ 118.697155] uvcvideo 2-1:1.0: usb_probe_interface
[ 118.697460] uvcvideo 2-1:1.0: usb_probe_interface - got id
[ 118.702992] uvcvideo: Found UVC 1.00 device USB 2.0 Camera (058f:3821)
[ 118.723195] input: USB 2.0 Camera as /devices/platform/s5p-ohci/usb2/2-1/2-1:1.0/input/input7
[ 118.727174] usb 2-1: adding 2-1:1.1 (config #1, interface 1)
[ 118.738224] hub 2-0:1.0: state 7 ports 1 chg 0000 evt 0002
希望各位朋友，能指点一二。。。。谢谢
