SCSI trow USB-STORAGE or SBP2 Debug for buggy device

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Hello, list, I've tried to figure out why my external DVDRW Device has a 
problem using UDF, SCSI subsystem reports "Device not ready" when burning 
with growisofs, the media is being written perfect, no defective media or 
sector errors ater burning. I've tried diferent DVDRW and I discover that 
only pioneer has this issue DVR106D /107D/108D/109D/110D (I have a lot of 
them) but only trow usb-storage or sbp2 device converters I have this error, 
and with this error UDF system show bad sectors, there is not bad sectors, 
and it happens only when writing big files about more than 1 or 2MB, not 
100Kbyte files or many small files, Then is cause I guess the drive need some 
time to get ready again and I guess scsi system can resend the 
command?!?!?!?.

Then going more far away, I see there is a black list on SCSI system, 
scsi_devinfo.c that has a list of vendor and product identifications.
I've tried to add this line:
{"PIONEER", "DVD-RW  DVR-106D", NULL, BLIST_RETRY_HWERROR},

With no effects, Cause this error looks like not hardware error, is just not 
ready.

Then I have an Idea, what happen if on scsi_lib.c
if (!(req->flags & REQ_QUIET))
              dev_printk(KERN_INFO,
              &cmd->device->sdev_gendev,
              "Device not ready.\n");
              scsi_end_request(cmd, 0, this_count, 1);
              return;
I change scsi_end_request(cmd, 0, this_count, 1);
by a comparison about vendor ID and Model
and then if is a buggy one executes scsi_requeue_command(q, cmd); instead of 
scsi_end_request(cmd, 0, this_count, 1);

Can I use this vars to deal only the same situation and not sata, nor usb-card 
reader, etc. etc.?!?!?!??!?!?!?!?
&cmd->device->vendor
&cmd->device->model
&cmd->pid
&cmd->sc_magic

How can I print it with prontk, I should use ?!?!?!
printk("Vendor: %s Model: %s Pid: %s Magic %s DevNotReady_Error\n", 
        &cmd->device->vendor, 
        &cmd->device->model, 
        &cmd->pid, 
        &cmd->sc_magic);

This device seems to require more patient to get ready...

this is my log USB-STORAGE generic adapter

Apr  3 18:13:30 g kernel: usb 4-1: new full speed USB device using ehci_hcd 
and address 2
Apr  3 18:13:30 g kernel: scsi2 : SCSI emulation for USB Mass Storage devices
Apr  3 18:13:35 g kernel:   Vendor: PIONEER   Model: DVD-RW  DVR-106D  Rev: 
1.08
Apr  3 18:13:35 g kernel:   Type:   CD-ROM                             ANSI 
SCSI revision: 00
Apr  3 18:13:35 g kernel: sr0: scsi3-mmc drive: 32x/32x writer cd/rw xa/form2 
cdda tray
Apr  3 18:13:35 g scsi.agent[14695]: cdrom 
at /devices/pci0000:00/0000:00:10.3/usb4/4-1/4-1:1.0/host2/target2:0:0/2:0:0:0
Apr  3 18:13:53 g kernel: cdrom: This disc doesn't have any tracks I 
recognize!
Apr  3 18:14:42 g kernel: sr 2:0:0:0: Device not ready.
Apr  3 18:15:13 g last message repeated 21 times
Apr  3 18:16:14 g last message repeated 31 times
Apr  3 18:17:16 g last message repeated 31 times
Apr  3 18:18:17 g last message repeated 31 times
Apr  3 18:19:19 g last message repeated 31 times
Apr  3 18:20:20 g last message repeated 30 times
Apr  3 18:21:21 g last message repeated 28 times
Apr  3 18:22:22 g last message repeated 30 times
Apr  3 18:23:24 g last message repeated 31 times

diferent USB-STORAGE+ieee1394:
Apr  7 23:28:54 g kernel: sbp2: $Rev: 1306 $ Ben Collins <[email protected]>
Apr  7 23:28:54 g kernel: scsi2 : SCSI emulation for IEEE-1394 SBP-2 Devices
Apr  7 23:28:55 g kernel: ieee1394: sbp2: Logged into SBP-2 device
Apr  7 23:28:55 g kernel:   Vendor: PIONEER   Model: DVD-RW  DVR-110D  Rev: 
1.37
Apr  7 23:28:55 g kernel:   Type:   CD-ROM                             ANSI 
SCSI revision: 00
Apr  7 23:28:55 g kernel: sr1: scsi3-mmc drive: 1x/351x xa/form2 tray
Apr  7 23:28:55 g scsi.agent[9237]: cdrom 
at /devices/pci0000:00/0000:00:14.0/fw-host0/0050c50250004101/0050c50250004101-0/h
Apr  7 23:28:56 g fstab-sync[9271]: added mount point /media/cdrom 
for /dev/sr1
Apr  7 23:28:56 g kernel: cdrom: This disc doesn't have any tracks I 
recognize!
Apr  7 23:32:11 g kernel: sr 2:0:0:0: Device not ready.
Apr  7 23:32:42 g last message repeated 290 times
Apr  7 23:33:45 g last message repeated 182 times
Apr  7 23:34:46 g last message repeated 92 times
Apr  7 23:35:47 g last message repeated 87 times
Apr  7 23:36:48 g last message repeated 103 times
Apr  7 23:37:50 g last message repeated 128 times
Apr  7 23:38:51 g last message repeated 140 times
Apr  7 23:39:52 g last message repeated 157 times
Apr  7 23:40:06 g last message repeated 65 times

SBP2 with another DVDR107
Oct 11 10:53:52 g kernel: sbp2: $Rev: 1219 $ Ben Collins <[email protected]>
Oct 11 10:53:52 g kernel: scsi0 : SCSI emulation for IEEE-1394 SBP-2 Devices
Oct 11 10:53:52 g net.agent[8231]: add event not handled
Oct 11 10:53:53 g kernel: ieee1394: sbp2: Logged into SBP-2 device
Oct 11 10:53:53 g kernel:   Vendor: PIONEER   Model: DVD-RW  DVR-107D  Rev: 
1.21
Oct 11 10:53:53 g kernel:   Type:   CD-ROM                             ANSI 
SCSI revision: 02
Oct 11 10:53:53 g kernel: sr0: scsi3-mmc drive: 62x/62x writer cd/rw xa/form2 
cdda tray
Oct 11 10:53:53 g scsi.agent[8285]: cdrom 
at /devices/pci0000:00/0000:00:14.0/fw-host0/0050c50250004101/0050c50250004101-0/h
Oct 11 10:56:21 g kernel: XFS mounting filesystem hda6
Oct 11 11:00:09 g kernel: Device sr0 not ready.
Oct 11 11:00:40 g last message repeated 145 times
Oct 11 11:01:41 g last message repeated 178 times
Oct 11 11:02:40 g last message repeated 174 times


any thougts?

-- 
Gustavo Guillermo Pérez
Compunauta uLinux
www.compunauta.com
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