2.6.37-rc5, pata_atiixp, DVD-ROM: kernel log flooded with "rpm_resume flags 0x4", "rpm_resume returns 1"

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Hi,

I just booted from 2.6.36 (without PM debugging configured) into
2.6.37-rc5 (with PM debugging enabled).  There is endless log spam like
this:

Dec 11 17:11:31 stein kernel: scsi host6: rpm_resume flags 0x4
Dec 11 17:11:31 stein kernel: scsi host6: rpm_resume returns 1
Dec 11 17:11:31 stein kernel: scsi host6: rpm_resume flags 0x4
Dec 11 17:11:31 stein kernel: scsi host6: rpm_resume returns 1
Dec 11 17:11:31 stein kernel: scsi host6: rpm_resume flags 0x4
Dec 11 17:11:31 stein kernel: scsi host6: rpm_resume returns 1
Dec 11 17:11:33 stein kernel: scsi host6: rpm_resume flags 0x4
Dec 11 17:11:33 stein kernel: scsi host6: rpm_resume returns 1
Dec 11 17:11:33 stein kernel: scsi host6: rpm_resume flags 0x4
Dec 11 17:11:33 stein kernel: scsi host6: rpm_resume returns 1
Dec 11 17:11:33 stein kernel: scsi host6: rpm_resume flags 0x4
Dec 11 17:11:33 stein kernel: scsi host6: rpm_resume returns 1
Dec 11 17:11:33 stein kernel: scsi host6: rpm_resume flags 0x4
Dec 11 17:11:33 stein kernel: scsi host6: rpm_resume returns 1
Dec 11 17:11:33 stein kernel: scsi host6: rpm_resume flags 0x4
Dec 11 17:11:33 stein kernel: scsi host6: rpm_resume returns 1
Dec 11 17:11:33 stein kernel: scsi host6: rpm_resume flags 0x4
Dec 11 17:11:33 stein kernel: scsi host6: rpm_resume returns 1
Dec 11 17:11:35 stein kernel: scsi host6: rpm_resume flags 0x4
Dec 11 17:11:35 stein kernel: scsi host6: rpm_resume returns 1
Dec 11 17:11:35 stein kernel: scsi host6: rpm_resume flags 0x4
Dec 11 17:11:35 stein kernel: scsi host6: rpm_resume returns 1
Dec 11 17:11:35 stein kernel: scsi host6: rpm_resume flags 0x4
Dec 11 17:11:35 stein kernel: scsi host6: rpm_resume returns 1
Dec 11 17:11:35 stein kernel: scsi host6: rpm_resume flags 0x4
Dec 11 17:11:35 stein kernel: scsi host6: rpm_resume returns 1
Dec 11 17:11:35 stein kernel: scsi host6: rpm_resume flags 0x4
Dec 11 17:11:35 stein kernel: scsi host6: rpm_resume returns 1
Dec 11 17:11:35 stein kernel: scsi host6: rpm_resume flags 0x4
Dec 11 17:11:35 stein kernel: scsi host6: rpm_resume returns 1
Dec 11 17:11:37 stein kernel: scsi host6: rpm_resume flags 0x4
Dec 11 17:11:37 stein kernel: scsi host6: rpm_resume returns 1
Dec 11 17:11:37 stein kernel: scsi host6: rpm_resume flags 0x4
Dec 11 17:11:37 stein kernel: scsi host6: rpm_resume returns 1
Dec 11 17:11:37 stein kernel: scsi host6: rpm_resume flags 0x4
Dec 11 17:11:37 stein kernel: scsi host6: rpm_resume returns 1

Why is rpm_resume performed 6 times every two seconds?

host6 is pata_atiixp with an:

00:14.1 IDE interface: ATI Technologies Inc SB700/SB800 IDE Controller
(prog-if 8a [Master SecP PriP])

# grep . /sys/class/scsi_host/host6/power/*
/sys/class/scsi_host/host6/power/async:enabled
grep: /sys/class/scsi_host/host6/power/autosuspend_delay_ms: Input/output error
/sys/class/scsi_host/host6/power/control:auto
/sys/class/scsi_host/host6/power/runtime_active_kids:0
/sys/class/scsi_host/host6/power/runtime_active_time:0
/sys/class/scsi_host/host6/power/runtime_enabled:disabled
/sys/class/scsi_host/host6/power/runtime_status:unsupported
/sys/class/scsi_host/host6/power/runtime_suspended_time:0
/sys/class/scsi_host/host6/power/runtime_usage:0

Attached to it is one device:

Host: scsi6 Channel: 00 Id: 00 Lun: 00
  Vendor: PLEXTOR  Model: DVD-ROM PX-130A  Rev: 1.01
  Type:   CD-ROM                           ANSI  SCSI revision: 05

# grep . /sys/class/scsi_host/host6/device/target6\:0\:0/6\:0\:0\:0/power/*
/sys/class/scsi_host/host6/device/target6:0:0/6:0:0:0/power/async:enabled
grep: /sys/class/scsi_host/host6/device/target6:0:0/6:0:0:0/power/autosuspend_delay_ms: Input/output error
/sys/class/scsi_host/host6/device/target6:0:0/6:0:0:0/power/control:on
/sys/class/scsi_host/host6/device/target6:0:0/6:0:0:0/power/runtime_active_kids:0
/sys/class/scsi_host/host6/device/target6:0:0/6:0:0:0/power/runtime_active_time:2689146
/sys/class/scsi_host/host6/device/target6:0:0/6:0:0:0/power/runtime_enabled:forbidden
/sys/class/scsi_host/host6/device/target6:0:0/6:0:0:0/power/runtime_status:active
/sys/class/scsi_host/host6/device/target6:0:0/6:0:0:0/power/runtime_suspended_time:0
/sys/class/scsi_host/host6/device/target6:0:0/6:0:0:0/power/runtime_usage:2
-- 
Stefan Richter
-=====-==-=- ==-- -=-==
http://arcgraph.de/sr/
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