pktcdvd driver bug?

Hi,

I got a new external dvd burner from LG (GSA-5163D) and want to use this 
device for backup purposes. Therefore I tried to use the standard blockdevice 
(for me it's /dev/sr0) and created a new udf filesystem on a blank dvd-ram. 
But the writing performance can't be called performance because writing speed 
is 150 kb/s. Therefore I've tried to use the pktcdvd driver to improve 
writing performance but I didn't get it working with my device. I did some 
debuging but I've reached a point where I don't know what I have to do now.

What I've done so far:
- "pktsetup dvdram /dev/sr0" throws an error in dmesg.

- enabled debugging in include/linux/pktcdvd.h: "#define PACKET_DEBUG 2"

- added some VPRINTK statements to drivers/block/pktcdvd.c to find out what 
doesn't work: in "static int pkt_generic_packet(struct pktcdvd_device *pd, 
struct packet_command *cgc)" rq->errors is set to 134217730 after 
"wait_for_completion(&wait);" has been called. Due to my VPRINTK statements 
and dmesg "generic_unplug_device(q);" will never be called in this function 
which is strange because it should be called just before 
"wait_for_completion(&wait);".

- Here is the dmesg dump after pluging in my device and calling "pktsetup 
dvdram /dev/sr0":
Dec 27 05:17:53 [kernel] usb 1-3: new high speed USB device using ehci_hcd and 
address 4
Dec 27 05:17:54 [kernel] scsi2 : SCSI emulation for USB Mass Storage devices
Dec 27 05:17:54 [kernel] usb-storage: device found at 4
Dec 27 05:17:54 [kernel] usb-storage: waiting for device to settle before 
scanning
Dec 27 05:17:59 [kernel]   Vendor: HL-DT-ST  Model: DVDRAM GSA-5163D  Rev: 
A105
Dec 27 05:17:59 [kernel] sr0: scsi3-mmc drive: 23x/23x writer dvd-ram cd/rw 
xa/form2 cdda tray
Dec 27 05:17:59 [kernel] usb-storage: device scan complete
Dec 27 05:19:00 [kernel] pktcdvd: v0.2.0a 2004-07-14 Jens Axboe 
([email protected]) and [email protected]
Dec 27 05:19:12 [kernel] kcdrwd: i:0 ow:0 rw:0 ww:0 rec:0 fin:0
Dec 27 05:19:12 [kernel] pktcdvd: entering open
Dec 27 05:19:12 [kernel] pktcdvd:   elv_add_request: rq->errors: 0
                - Last output repeated 2 times -
Dec 27 05:19:12 [kernel] pktcdvd:   pkt_generic_packet: rq->errors: 134217730

- necessary parts of "lspci -v":
00:1d.0 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) 
USB UHCI Controller #1 (rev 01) (prog-if 00 [UHCI])
        Subsystem: IBM Unknown device 052d
        Flags: bus master, medium devsel, latency 0, IRQ 11
        I/O ports at 1800 [size=32]

00:1d.1 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) 
USB UHCI Controller #2 (rev 01) (prog-if 00 [UHCI])
        Subsystem: IBM Unknown device 052d
        Flags: bus master, medium devsel, latency 0, IRQ 11
        I/O ports at 1820 [size=32]

00:1d.2 USB Controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) 
USB UHCI Controller #3 (rev 01) (prog-if 00 [UHCI])
        Subsystem: IBM Unknown device 052d
        Flags: bus master, medium devsel, latency 0, IRQ 11
        I/O ports at 1840 [size=32]

00:1d.7 USB Controller: Intel Corporation 82801DB/DBM (ICH4/ICH4-M) USB2 EHCI 
Controller (rev 01) (prog-if 20 [EHCI])
        Subsystem: IBM Unknown device 052e
        Flags: bus master, medium devsel, latency 0, IRQ 11
        Memory at c0000000 (32-bit, non-prefetchable) [size=1K]
        Capabilities: [50] Power Management version 2
        Capabilities: [58] Debug port

- "lsusb -v":
Bus 004 Device 001: ID 0000:0000  
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            9 Hub
  bDeviceSubClass         0 Unused
  bDeviceProtocol         0 
  bMaxPacketSize0         8
  idVendor           0x0000 
  idProduct          0x0000 
  bcdDevice            2.06
  iManufacturer           3 Linux 2.6.14-gentoo-r5r40 uhci_hcd
  iProduct                2 UHCI Host Controller
  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 Unused
      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  
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            9 Hub
  bDeviceSubClass         0 Unused
  bDeviceProtocol         0 
  bMaxPacketSize0         8
  idVendor           0x0000 
  idProduct          0x0000 
  bcdDevice            2.06
  iManufacturer           3 Linux 2.6.14-gentoo-r5r40 uhci_hcd
  iProduct                2 UHCI Host Controller
  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 Unused
      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 001: ID 0000:0000  
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               1.10
  bDeviceClass            9 Hub
  bDeviceSubClass         0 Unused
  bDeviceProtocol         0 
  bMaxPacketSize0         8
  idVendor           0x0000 
  idProduct          0x0000 
  bcdDevice            2.06
  iManufacturer           3 Linux 2.6.14-gentoo-r5r40 uhci_hcd
  iProduct                2 UHCI Host Controller
  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 Unused
      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 003: ID 152e:e003  
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x152e 
  idProduct          0xe003 
  bcdDevice            0.01
  iManufacturer           1 HL-DT-ST DVDRAM GSA-5163D
  iProduct                2 Super Multi DVD Rewriter
  iSerial                 3 4B13E050
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           32
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0xc0
      Self Powered
    MaxPower              100mA
    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     0x01  EP 1 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               none
        wMaxPacketSize        512
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               none
        wMaxPacketSize        512
        bInterval               0
  Language IDs: (length=4)
     0409 English(US)

Bus 001 Device 001: ID 0000:0000  
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            9 Hub
  bDeviceSubClass         0 Unused
  bDeviceProtocol         1 Single TT
  bMaxPacketSize0         8
  idVendor           0x0000 
  idProduct          0x0000 
  bcdDevice            2.06
  iManufacturer           3 Linux 2.6.14-gentoo-r5r40 ehci_hcd
  iProduct                2 EHCI Host Controller
  iSerial                 1 0000:00:1d.7
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           25
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         9 Hub
      bInterfaceSubClass      0 Unused
      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              12
  Language IDs: (length=4)
     0409 English(US)


Greetings
Gerald

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