Hi Alan, Here is the full log . During a reboot the usb device is enumerated in High speed (480 Mb/s) . The it change status to full Speed (12 Mb/s) followed by a disconnect . After this the device is again enumerated back in High speed . [ 0.971658] ehci_hcd 0000:00:1a.7: GetStatus port 2 status 001803 POWER sig=j CSC CONNECT [ 0.971664] hub 1-0:1.0: port 2: status 0501 change 0001 [ 0.985953] hub 2-0:1.0: state 7 ports 6 chg 0000 evt 0000 [ 1.070025] hub 1-0:1.0: state 7 ports 6 chg 0004 evt 0000 [ 1.070033] hub 1-0:1.0: port 2, status 0501, change 0000, 480 Mb/s [ 1.121455] ehci_hcd 0000:00:1a.7: port 2 high speed [ 1.121459] ehci_hcd 0000:00:1a.7: GetStatus port 2 status 001005 POWER sig=se0 PE CONNECT [ 1.161029] ata1: SATA link down (SStatus 0 SControl 310) [ 1.172026] usb 1-2: new high speed USB device using ehci_hcd and address 2 [ 1.223323] ehci_hcd 0000:00:1a.7: port 2 high speed [ 1.223327] ehci_hcd 0000:00:1a.7: GetStatus port 2 status 001005 POWER sig=se0 PE CONNECT [ 1.287204] usb 1-2: default language 0x0409 [ 1.288080] usb 1-2: udev 2, busnum 1, minor = 1 [ 1.288083] usb 1-2: New USB device found, idVendor=0e39, idProduct=2b00 [ 1.288086] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 1.288089] usb 1-2: Product: eUSB [ 1.288097] usb 1-2: Manufacturer: SMART [ 1.288099] usb 1-2: SerialNumber: 23156507103421210411 [ 1.288196] usb 1-2: usb_probe_device [ 1.288199] usb 1-2: configuration #1 chosen from 1 choice [ 1.288331] usb 1-2: adding 1-2:1.0 (config #1, interface 0) [ 1.288409] usb-storage 1-2:1.0: usb_probe_interface [ 1.288414] usb-storage 1-2:1.0: usb_probe_interface - got id [ 1.288463] scsi4 : SCSI emulation for USB Mass Storage devices [ 1.288547] usb-storage: device found at 2 [ 1.288548] usb-storage: waiting for device to settle before scanning .......................................................... [ 47.261779] hub 8-0:1.0: local power source is good [ 47.261781] hub 8-0:1.0: trying to enable port power on non-switchable hub [ 47.261799] /scratch/abwaheed/asr/thr_0618/os/linux/drivers/usb/core/inode.c: creating file '001' [ 47.356165] uhci_hcd 0000:00:1a.0: port 2 portsc 0082,00 [ 47.358026] hub 4-0:1.0: state 7 ports 2 chg 0000 evt 0000 [ 47.359329] hub 5-0:1.0: state 7 ports 2 chg 0000 evt 0000 [ 47.360184] hub 6-0:1.0: state 7 ports 2 chg 0000 evt 0000 [ 47.360188] hub 7-0:1.0: state 7 ports 2 chg 0000 evt 0000 [ 47.361181] hub 8-0:1.0: state 7 ports 2 chg 0000 evt 0000 [ 47.456243] hub 3-0:1.0: state 7 ports 2 chg 0000 evt 0000 [ 48.454151] usb usb4: suspend_rh (auto-stop) [ 48.454174] usb usb5: suspend_rh (auto-stop) [ 48.454194] usb usb6: suspend_rh (auto-stop) [ 48.454219] usb usb7: suspend_rh (auto-stop) [ 48.454238] usb usb8: suspend_rh (auto-stop) [ 48.454257] usb usb3: suspend_rh (auto-stop) ..................................................... [ 157.150578] hub 1-0:1.0: state 7 ports 6 chg 0000 evt 0004 [ 157.150593] ehci_hcd 0000:00:1a.7: GetStatus port 2 status 001002 POWER sig=se0 CSC [ 157.150604] hub 1-0:1.0: port 2, status 0100, change 0001, 12 Mb/s [ 157.150608] usb 1-2: USB disconnect, address 2 [ 157.150611] usb 1-2: unregistering device [ 157.150614] usb 1-2: unregistering interface 1-2:1.0 [ 208.704131] sd 4:0:0:0: Device offlined - not ready after error recovery [ 208.704158] sd 4:0:0:0: [sda] Unhandled error code [ 208.704160] sd 4:0:0:0: [sda] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK [ 208.704164] sd 4:0:0:0: [sda] CDB: Write(10): 2a 00 00 00 00 21 00 00 08 00 [ 208.704189] sd 4:0:0:0: [sda] Unhandled error code [ 208.704191] sd 4:0:0:0: [sda] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK [ 208.704194] sd 4:0:0:0: [sda] CDB: Write(10): 2a 00 00 1c 00 21 00 00 08 00 [ 208.821178] usb 1-2: usb_disable_device nuking all URBs [ 208.889097] ehci_hcd 0000:00:1a.7: GetStatus port 2 status 001803 POWER sig=j CSC CONNECT [ 208.993049] hub 1-0:1.0: debounce: port 2: total 100ms stable 100ms status 0x501 [ 209.044332] ehci_hcd 0000:00:1a.7: port 2 high speed [ 209.044339] ehci_hcd 0000:00:1a.7: GetStatus port 2 status 001005 POWER sig=se0 PE CONNECT [ 209.095081] usb 1-2: new high speed USB device using ehci_hcd and address 3 [ 209.146326] ehci_hcd 0000:00:1a.7: port 2 high speed [ 209.146332] ehci_hcd 0000:00:1a.7: GetStatus port 2 status 001005 POWER sig=se0 PE CONNECT [ 209.154428] Pid: 9087, comm: find Tainted: P 2.6.32.39 #3 [ 209.154431] Call Trace: [ 209.154439] [<ffffffff81042364>] ? warn_slowpath_common+0x76/0x8c [ 209.154442] [<ffffffff810efa0b>] ? mark_buffer_dirty+0x23/0x80 [ 209.154447] [<ffffffff81135c57>] ? ext2_sync_super+0x37/0x4f [ 209.154451] [<ffffffff811361d8>] ? ext2_put_super+0x5c/0x10c [ 209.154455] [<ffffffff810d23c1>] ? generic_shutdown_super+0x4f/0xc5 [ 209.154458] [<ffffffff810d2457>] ? kill_block_super+0x20/0x35 [ 209.154461] [<ffffffff810d2af2>] ? deactivate_super+0x49/0x63 [ 209.154464] [<ffffffff810ee73c>] ? set_fs_pwd+0x5b/0x62 [ 209.154469] [<ffffffff810cf2b8>] ? sys_fchdir+0x5f/0x6e [ 209.154473] [<ffffffff81029ff5>] ? sysenter_dispatch+0x7/0x2b [ 209.154476] ---[ end trace c5201176b7b83c7b ]--- [ 209.210207] usb 1-2: default language 0x0409 [ 209.211085] usb 1-2: udev 3, busnum 1, minor = 2 [ 209.211088] usb 1-2: New USB device found, idVendor=0e39, idProduct=2b00 [ 209.211091] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 209.211095] usb 1-2: Product: eUSB [ 209.211097] usb 1-2: Manufacturer: SMART [ 209.211165] usb 1-2: SerialNumber: 23156507103421210411 [ 209.211479] usb 1-2: usb_probe_device [ 209.211484] usb 1-2: configuration #1 chosen from 1 choice [ 209.211587] usb 1-2: adding 1-2:1.0 (config #1, interface 0) [ 209.211675] usb-storage 1-2:1.0: usb_probe_interface [ 209.211680] usb-storage 1-2:1.0: usb_probe_interface - got id [ 209.211753] scsi5 : SCSI emulation for USB Mass Storage devices [ 209.211874] /scratch/abwaheed/asr/thr_0618/os/linux/drivers/usb/core/inode.c: creating file '003' [ 209.211901] hub 1-0:1.0: state 7 ports 6 chg 0000 evt 0004 [ 209.211911] usb-storage: device found at 3 [ 209.211913] usb-storage: waiting for device to settle before scanning Regards, Shaiju. -----Original Message----- From: Alan Stern [mailto:stern@xxxxxxxxxxxxxxxxxxx] Sent: Saturday, July 28, 2012 2:08 PM To: shaiju shaiju Cc: 'Sadasivan Shaiju'; 'Peter Chen'; 'USB list' Subject: RE: usb hub is n't recognised during boot up(sometimes) On Sat, 28 Jul 2012, shaiju shaiju wrote: > Hi Alan, > > I am not worried about the stack trace . I am worried is the > USB is getting disconnected automatically. > Then it debounce back to Highspeed . The log you posted didn't say anything about a USB device getting disconnected automatically. The disconnect event looked like it was caused by you unplugging a USB cable. Also, how is this related to "RE: usb hub is n't recognised during boot up(sometimes)"? Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
