linux-kernel - Re: [linux-pm] 2.6.37-rc5, pata_atiixp, DVD-ROM: kernel log flooded with "rpm_resume flags 0x4", "rpm

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Date:	Fri, 17 Dec 2010 21:30:34 +0100
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	linux-pm@...ts.linux-foundation.org, <linux-ide@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, "Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [linux-pm] 2.6.37-rc5, pata_atiixp, DVD-ROM: kernel log flooded
 with "rpm_resume flags 0x4", "rpm_resume returns 1"

On Dec 17 Stefan Richter wrote:
> On Dec 11 Alan Stern wrote:
> > This is probably because hal probes the DVD drive every two seconds
> > looking for media changes.  However that's not supposed to cause
> > rpm_resume to be called for the host unless runtime PM is allowed for
> > the DVD drive, which it isn't according to your listings below.  So
> > there's a bug somewhere.
> 
> I had 2.6.36 running since then and have now booted into 2.6.37-rc6.
> 
> Yes, it is hal indeed.  Shutting hal down avoids this logging activity.
[...]
> Actually, this time I see once every two seconds a message about
> logical unit 6:0:0:0 and 6 times every two seconds a message about
> host7:
> 
> Dec 17 20:22:08 stein kernel: sd 6:0:0:0: rpm_resume flags 0x4
> Dec 17 20:22:08 stein kernel: sd 6:0:0:0: rpm_resume returns 1
> Dec 17 20:22:08 stein kernel: scsi host7: rpm_resume flags 0x4
> Dec 17 20:22:08 stein kernel: scsi host7: rpm_resume returns 1
> Dec 17 20:22:08 stein kernel: scsi host7: rpm_resume flags 0x4
> Dec 17 20:22:08 stein kernel: scsi host7: rpm_resume returns 1
> Dec 17 20:22:08 stein kernel: scsi host7: rpm_resume flags 0x4
> Dec 17 20:22:08 stein kernel: scsi host7: rpm_resume returns 1
> Dec 17 20:22:08 stein kernel: scsi host7: rpm_resume flags 0x4
> Dec 17 20:22:08 stein kernel: scsi host7: rpm_resume returns 1
> Dec 17 20:22:08 stein kernel: scsi host7: rpm_resume flags 0x4
> Dec 17 20:22:08 stein kernel: scsi host7: rpm_resume returns 1
> Dec 17 20:22:08 stein kernel: scsi host7: rpm_resume flags 0x4
> Dec 17 20:22:08 stein kernel: scsi host7: rpm_resume returns 1
> Dec 17 20:22:10 stein kernel: sd 6:0:0:0: rpm_resume flags 0x4
> Dec 17 20:22:10 stein kernel: sd 6:0:0:0: rpm_resume returns 1
> Dec 17 20:22:10 stein kernel: scsi host7: rpm_resume flags 0x4
> Dec 17 20:22:10 stein kernel: scsi host7: rpm_resume returns 1
> Dec 17 20:22:10 stein kernel: scsi host7: rpm_resume flags 0x4
> Dec 17 20:22:10 stein kernel: scsi host7: rpm_resume returns 1
> Dec 17 20:22:10 stein kernel: scsi host7: rpm_resume flags 0x4
> Dec 17 20:22:10 stein kernel: scsi host7: rpm_resume returns 1
> Dec 17 20:22:10 stein kernel: scsi host7: rpm_resume flags 0x4
> Dec 17 20:22:10 stein kernel: scsi host7: rpm_resume returns 1
> Dec 17 20:22:10 stein kernel: scsi host7: rpm_resume flags 0x4
> Dec 17 20:22:10 stein kernel: scsi host7: rpm_resume returns 1
> Dec 17 20:22:10 stein kernel: scsi host7: rpm_resume flags 0x4
> Dec 17 20:22:10 stein kernel: scsi host7: rpm_resume returns 1
> 
> sd 6:0:0:0 is a USB card reader built into a monitor:
> Host: scsi6 Channel: 00 Id: 00 Lun: 00
>   Vendor: Generic  Model: Ultra HS-SD/MMC  Rev: 1.88
>   Type:   Direct-Access                    ANSI  SCSI revision: 00

Well right --- hald polls the card reader for media change too.

I now noticed that the two lines
	sd *:0:0:0: rpm_resume flags 0x4
	sd *:0:0:0: rpm_resume returns 1
are logged once for each sd device (i.e. those with fixed media too)
at the startup of hald.  Is this expected?

Note, I have not seen anything of the sort on another PC which runs
2.3.37-rc6 with the same PM debug options.  The differences are that
the other PC is an Intel 945GM based one with x86-32 kernel and 32bit
Gentoo userland, whereas the PC with log spam is an AMD RS780 based one
with x86-64 kernel and 64bit Gentoo userland.  Both got hal 0.5.14-r2.
-- 
Stefan Richter
-=====-==-=- ==-- =---=
http://arcgraph.de/sr/
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