I'm polling for changes in USB devices; when something changes, I grab the
contents of idVendor, idProduct, serial, product and manufacturer. (The
serial is used to make a best effort at detecting when a previously-known
device was inserted; though I'm seeing that many devices don't have unique
serials or anything close--best effort will have to do, I guess.)
This occasionally causes a timeout with some USB pen drives.
Running
while true; do cat
/sys/devices/pci0000:00/0000:00:1d.1/usb2/2-2/2-2.1/serial; done
and inserting an Attache stick with ub loaded will display the serial
about five to seven times and then hang. usb-storage spams the serial
during the "waiting for device to settle" delay, and then similarly
hangs (logs attached).
2.6.10 and 2.6.11-rc4-bk8.
(re: "over 100mA budget", taking the device off of the bus-powered hub
does the same thing.)
--
Glenn Maynard
<7>hub 2-2:1.0: state 5 ports 4 chg 0000 evt 0002
<7>hub 2-2:1.0: port 1, status 0101, change 0001, 12 Mb/s
<7>hub 2-2:1.0: debounce: port 1: total 100ms stable 100ms status 0x101
<6>usb 2-2.1: new full speed USB device using uhci_hcd and address 6
<7>usb 2-2.1: new device strings: Mfr=1, Product=2, SerialNumber=3
<7>usb 2-2.1: default language 0x0409
<6>usb 2-2.1: Product: USB DISK 12X
<6>usb 2-2.1: Manufacturer:
<6>usb 2-2.1: SerialNumber: 07410E1A052F
<7>usb 2-2.1: hotplug
<7>usb 2-2.1: adding 2-2.1:1.0 (config #1, interface 0)
<7>usb 2-2.1:1.0: hotplug
<7>usb-storage 2-2.1:1.0: usb_probe_interface
<7>usb-storage 2-2.1:1.0: usb_probe_interface - got id
<6>scsi1 : SCSI emulation for USB Mass Storage devices
<4>usb 2-2.1: 100mA over 100mA budget!
<7>hub 2-2:1.0: 200mA power budget left
<7>hub 2-2:1.0: state 5 ports 4 chg 0000 evt 0002
<7>usb-storage: device found at 6
<7>usb-storage: waiting for device to settle before scanning
<5> Vendor: Model: USB DISK 12X Rev: 1.07
<5> Type: Direct-Access ANSI SCSI revision: 00
<5>SCSI device sda: 243712 512-byte hdwr sectors (125 MB)
<5>sda: assuming Write Enabled
<3>sda: assuming drive cache: write through
<5>SCSI device sda: 243712 512-byte hdwr sectors (125 MB)
<5>sda: assuming Write Enabled
<3>sda: assuming drive cache: write through
<6> sda:<4>usb 2-2.1: cat timed out on ep0in
<4>usb 2-2.1: cat timed out on ep0in
<7>hub 2-2:1.0: state 5 ports 4 chg 0000 evt 0002
<7>hub 2-2:1.0: port 1, status 0101, change 0001, 12 Mb/s
<7>hub 2-2:1.0: debounce: port 1: total 100ms stable 100ms status 0x101
<6>usb 2-2.1: new full speed USB device using uhci_hcd and address 4
<7>usb 2-2.1: new device strings: Mfr=1, Product=2, SerialNumber=3
<7>usb 2-2.1: default language 0x0409
<6>usb 2-2.1: Product: USB DISK 12X
<6>usb 2-2.1: Manufacturer:
<6>usb 2-2.1: SerialNumber: 07410E1A052F
<7>usb 2-2.1: hotplug
<7>usb 2-2.1: adding 2-2.1:1.0 (config #1, interface 0)
<7>usb 2-2.1:1.0: hotplug
<7>ub 2-2.1:1.0: usb_probe_interface
<7>ub 2-2.1:1.0: usb_probe_interface - got id
<6>uba: device 4 capacity nsec 243712 bsize 512
<6>uba: device 4 capacity nsec 243712 bsize 512
<6> uba:end_request: I/O error, dev uba, sector 0
<3>Buffer I/O error on device uba, logical block 0
<4>usb 2-2.1: cat timed out on ep0in
<4>usb 2-2.1: cat timed out on ep0in
<4>end_request: I/O error, dev uba, sector 0
<3>Buffer I/O error on device uba, logical block 0
<4> unable to read partition table
<4>usb 2-2.1: 100mA over 100mA budget!
<7>hub 2-2:1.0: 200mA power budget left
<7>hub 2-2:1.0: state 5 ports 4 chg 0000 evt 0002
<4>usb 2-2.1: cat timed out on ep0in
<4>usb 2-2.1: cat timed out on ep0in
Bus 004 Device 001: ID 0000:0000 Virtual Hub
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 9 Hub
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x0000 Virtual
idProduct 0x0000 Hub
bcdDevice 2.06
iManufacturer 3 Linux 2.6.11-rc4-bk8 uhci_hcd
iProduct 2 Intel Corp. 82801EB/ER (ICH5/ICH5R) USB UHCI #4
iSerial 1 0000:00:1d.3
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xc0
Self Powered
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type none
wMaxPacketSize 2
bInterval 255
Language IDs: (length=4)
0409 English(US)
Bus 003 Device 001: ID 0000:0000 Virtual Hub
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 9 Hub
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x0000 Virtual
idProduct 0x0000 Hub
bcdDevice 2.06
iManufacturer 3 Linux 2.6.11-rc4-bk8 uhci_hcd
iProduct 2 Intel Corp. 82801EB/ER (ICH5/ICH5R) USB UHCI #3
iSerial 1 0000:00:1d.2
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xc0
Self Powered
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type none
wMaxPacketSize 2
bInterval 255
Language IDs: (length=4)
0409 English(US)
Bus 002 Device 020: ID 0d7d:1400 Apacer
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 Interface
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x0d7d Apacer
idProduct 0x1400
bcdDevice 0.02
iManufacturer 1
iProduct 2 USB DISK 12X
iSerial 3 07410E1A052F
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 32
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
MaxPower 200mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 6 SCSI
bInterfaceProtocol 80 Bulk (Zip)
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type none
wMaxPacketSize 64
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type none
wMaxPacketSize 64
bInterval 0
Language IDs: (length=4)
0409 English(US)
Bus 002 Device 001: ID 0000:0000 Virtual Hub
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 9 Hub
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x0000 Virtual
idProduct 0x0000 Hub
bcdDevice 2.06
iManufacturer 3 Linux 2.6.11-rc4-bk8 uhci_hcd
iProduct 2 Intel Corp. 82801EB/ER (ICH5/ICH5R) USB UHCI #2
iSerial 1 0000:00:1d.1
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xc0
Self Powered
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type none
wMaxPacketSize 2
bInterval 255
Language IDs: (length=4)
0409 English(US)
Bus 001 Device 001: ID 0000:0000 Virtual Hub
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 9 Hub
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x0000 Virtual
idProduct 0x0000 Hub
bcdDevice 2.06
iManufacturer 3 Linux 2.6.11-rc4-bk8 uhci_hcd
iProduct 2 Intel Corp. 82801EB/ER (ICH5/ICH5R) USB UHCI #1
iSerial 1 0000:00:1d.0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xc0
Self Powered
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type none
wMaxPacketSize 2
bInterval 255
Language IDs: (length=4)
0409 English(US)
