[Bug 20112] New: dmesg spam: "scsi host5: __pm_runtime_resume() returns 1" (DVD writer)

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=20112

           Summary: dmesg spam: "scsi host5: __pm_runtime_resume() returns
                    1" (DVD writer)
           Product: SCSI Drivers
           Version: 2.5
    Kernel Version: Linux version 2.6.36-rc7-blueyed-00145-g50c6dc9
                    (root@base) (gcc version 4.4.5 (Ubuntu/Linaro
                    4.4.4-14ubuntu5) ) #2 SMP PREEMPT Mon Oct 11 21:53:45
                    CEST 2010
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Other
        AssignedTo: scsi_drivers-other@kernel-bugs.osdl.org
        ReportedBy: linux-bugs@thequod.de
        Regression: No


The system log gets spammed via dmesg with several of the following errors per
second:

Oct 11 22:53:39 base kernel: [ 2147.766956] scsi host5: __pm_runtime_resume()!
Oct 11 22:53:39 base kernel: [ 2147.766962] scsi host5: __pm_runtime_resume()
returns 1!

Apparently this refers to my DVD drive, according to the /proc files:

>From /proc/scsi/scsi:
Host: scsi5 Channel: 00 Id: 01 Lun: 00
  Vendor: HL-DT-ST Model: DVDRAM GSA-4163B Rev: A100
  Type:   CD-ROM                           ANSI  SCSI revision: 05

% cat /proc/scsi/sg/devices 
[...]
5       0       1       0       5       1       1       0       1

% cat /proc/scsi/sg/device_strs 
[...]
HL-DT-ST        DVDRAM GSA-4163B        A100

This might be caused by CONFIG_PM_DEBUG=y, and might actually be expected.
In this case, please excuse this report then - but consider making it less
verbose.

My /proc/config.gz unzipped: http://pastebin.com/knXt8nmw
lspci -vvv: http://pastebin.com/iMWbaUPC

Might this be related to the writer failing to detect rewritable media? (which
might be a regression I still would have to investigate deeper into)

(This might be related to https://bugzilla.kernel.org/show_bug.cgi?id=19712 -
where only a "__pm_runtime_resume()!" is posted repeatedly.)

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