Re: 2.5.64-mm6: oops in elv_remove_request

[Jeremy Fitzhardinge <jeremy@goop.org>]

On Fri, 2003-03-14 at 03:37, Jens Axboe wrote:
> Can you send me the output of -prcap?

# cdrecord -prcap
Cdrecord 2.01a05 (i686-pc-linux-gnu) Copyright (C) 1995-2002 J?rg Schilling
scsidev: '/dev/hdc'
devname: '/dev/hdc'
scsibus: -2 target: -2 lun: -2
Warning: Open by 'devname' is unintentional and not supported.
Linux sg driver version: 3.5.27
Using libscg version 'schily-0.7'
Device type    : Removable CD-ROM
Version        : 2
Response Format: 2
Capabilities   :
Vendor_info    : 'PLEXTOR '
Identifikation : 'CD-R   PX-W4824A'
Revision       : '1.04'
Device seems to be: Generic mmc CD-RW.

Drive capabilities, per MMC-3 page 2A:

  Does read CD-R media
  Does write CD-R media
  Does read CD-RW media
  Does write CD-RW media
  Does not read DVD-ROM media
  Does not read DVD-R media
  Does not write DVD-R media
  Does not read DVD-RAM media
  Does not write DVD-RAM media
  Does support test writing

  Does read Mode 2 Form 1 blocks
  Does read Mode 2 Form 2 blocks
  Does read digital audio blocks
  Does restart non-streamed digital audio reads accurately
  Does support Buffer-Underrun-Free recording
  Does read multi-session CDs
  Does read fixed-packet CD media using Method 2
  Does not read CD bar code
  Does read R-W subcode information
  Does return R-W subcode de-interleaved and error-corrected
  Does read raw P-W subcode data from lead in
  Does return CD media catalog number
  Does return CD ISRC information
  Does support C2 error pointers
  Does deliver composite A/V data

  Does play audio CDs
  Number of volume control levels: 256
  Does support individual volume control setting for each channel
  Does support independent mute setting for each channel
  Does not support digital output on port 1
  Does not support digital output on port 2

  Loading mechanism type: tray
  Does support ejection of CD via START/STOP command
  Does not lock media on power up via prevent jumper
  Does allow media to be locked in the drive via PREVENT/ALLOW command
  Is not currently in a media-locked state
  Does not support changing side of disk
  Does not have load-empty-slot-in-changer feature
  Does not support Individual Disk Present feature

  Maximum read  speed:  7056 kB/s (CD  40x, DVD  5x)
  Current read  speed:  7056 kB/s (CD  40x, DVD  5x)
  Maximum write speed:  8467 kB/s (CD  48x, DVD  6x)
  Current write speed:  8467 kB/s (CD  48x, DVD  6x)
  Rotational control selected: CLV/PCAV
  Buffer size in KB: 4096
  Copy management revision supported: 0
  Number of supported write speeds: 8
  Write speed # 0:  8467 kB/s CLV/PCAV (CD  48x, DVD  6x)
  Write speed # 1:  7056 kB/s CLV/PCAV (CD  40x, DVD  5x)
  Write speed # 2:  5645 kB/s CLV/PCAV (CD  32x, DVD  4x)
  Write speed # 3:  4234 kB/s CLV/PCAV (CD  24x, DVD  3x)
  Write speed # 4:  3528 kB/s CLV/PCAV (CD  20x, DVD  2x)
  Write speed # 5:  2822 kB/s CLV/PCAV (CD  16x, DVD  2x)
  Write speed # 6:  1411 kB/s CLV/PCAV (CD   8x, DVD  1x)
  Write speed # 7:   706 kB/s CLV/PCAV (CD   4x, DVD  0x)


But... When I first ran -checkdrive this morning, it gave me good
results:

# cdrecord -checkdrive
Cdrecord 2.01a05 (i686-pc-linux-gnu) Copyright (C) 1995-2002 J?rg Schilling
scsidev: '/dev/hdc'
devname: '/dev/hdc'
scsibus: -2 target: -2 lun: -2
Warning: Open by 'devname' is unintentional and not supported.
Linux sg driver version: 3.5.27
Using libscg version 'schily-0.7'
Device type    : Removable CD-ROM
Version        : 2
Response Format: 2
Capabilities   :
Vendor_info    : 'PLEXTOR '
Identifikation : 'CD-R   PX-W4824A'
Revision       : '1.04'
Device seems to be: Generic mmc CD-RW.
Using generic SCSI-3/mmc CD-R driver (mmc_cdr).
Driver flags   : MMC-3 SWABAUDIO BURNFREE VARIREC
Supported modes: TAO PACKET SAO SAO/R96P SAO/R96R RAW/R16 RAW/R96P RAW/R96R

But immediately afterwards:

# cdrecord -checkdrive
Cdrecord 2.01a05 (i686-pc-linux-gnu) Copyright (C) 1995-2002 J?rg Schilling
scsidev: '/dev/hdc'
devname: '/dev/hdc'
scsibus: -2 target: -2 lun: -2
Warning: Open by 'devname' is unintentional and not supported.
Linux sg driver version: 3.5.27
Using libscg version 'schily-0.7'
Device type    : Removable CD-ROM
Version        : 0
Response Format: 1
Vendor_info    : 'PLEXTOR '
Identifikation : 'CD-R   PX-W4824A'
Revision       : '1.04'
Device seems to be: Generic mmc CD-RW.
Using generic SCSI-3/mmc CD-R driver (mmc_cdr).
Driver flags   : MMC-3 SWABAUDIO BURNFREE VARIREC
Supported modes:

Ejecting and reinserting the disc seems to restore things:

# cdrecord -checkdrive
Cdrecord 2.01a05 (i686-pc-linux-gnu) Copyright (C) 1995-2002 J?rg Schilling
scsidev: '/dev/hdc'
devname: '/dev/hdc'
scsibus: -2 target: -2 lun: -2
Warning: Open by 'devname' is unintentional and not supported.
Linux sg driver version: 3.5.27
Using libscg version 'schily-0.7'
Device type    : Removable CD-ROM
Version        : 2
Response Format: 2
Capabilities   :
Vendor_info    : 'PLEXTOR '
Identifikation : 'CD-R   PX-W4824A'
Revision       : '1.04'
Device seems to be: Generic mmc CD-RW.
Using generic SCSI-3/mmc CD-R driver (mmc_cdr).
Driver flags   : MMC-3 SWABAUDIO BURNFREE VARIREC
Supported modes: TAO PACKET SAO SAO/R96P SAO/R96R RAW/R16 RAW/R96P RAW/R96R

Once:

# cdrecord -checkdrive
Cdrecord 2.01a05 (i686-pc-linux-gnu) Copyright (C) 1995-2002 J?rg Schilling
scsidev: '/dev/hdc'
devname: '/dev/hdc'
scsibus: -2 target: -2 lun: -2
Warning: Open by 'devname' is unintentional and not supported.
Linux sg driver version: 3.5.27
Using libscg version 'schily-0.7'
Device type    : Removable CD-ROM
Version        : 0
Response Format: 1
Vendor_info    : 'PLEXTOR '
Identifikation : 'CD-R   PX-W4824A'
Revision       : '1.04'
Device seems to be: Generic mmc CD-RW.
Using generic SCSI-3/mmc CD-R driver (mmc_cdr).
Driver flags   : MMC-3 SWABAUDIO BURNFREE VARIREC
Supported modes:

Notice the "version" and "response format" fields have changed.

	J