From: Andrew Morton <akpm@linux-foundation.org>
To: Bjorn Helgaas <bjorn.helgaas@hp.com>
Cc: jirislaby@gmail.com, matthew@wil.cx,
linux-kernel@vger.kernel.org, gregkh@suse.de,
linux-usb-devel@lists.sourceforge.net,
linux-pm@lists.linux-foundation.org, drzeus@drzeus.cx
Subject: Re: WARNING: at kernel/resource.c:189 __release_resource
Date: Thu, 29 Nov 2007 16:42:07 -0800 [thread overview]
Message-ID: <20071129164207.fd7bcd30.akpm@linux-foundation.org> (raw)
In-Reply-To: <200711291640.38158.bjorn.helgaas@hp.com>
On Thu, 29 Nov 2007 16:40:37 -0700
Bjorn Helgaas <bjorn.helgaas@hp.com> wrote:
> On Monday 26 November 2007 11:05:38 pm Andrew Morton wrote:
> > On Thu, 22 Nov 2007 22:41:16 +0100 Jiri Slaby <jirislaby@gmail.com> wrote:
> > > Ok, I hit the bug, suspend of 00:06 device complains about it:
> > > WARNING: at .../kernel/resource.c:185 __release_resource()
> > >
> > > Call Trace:
> > > [<ffffffff8023f7b5>] release_resource+0xb5/0xf0
> > > [<ffffffff8036cda0>] pnp_release_resources+0x70/0x130
> > > [<ffffffff8036db85>] pnp_stop_dev+0x45/0x90
> > > [<ffffffff8036c942>] pnp_bus_suspend+0x92/0xb0
> > > [<ffffffff803b9f73>] suspend_device+0x113/0x180
> > > [<ffffffff803ba330>] device_suspend+0x200/0x320
> > > [<ffffffff80266905>] suspend_devices_and_enter+0xa5/0x170
> > > [<ffffffff80266bd9>] enter_state+0x209/0x270
> > > [<ffffffff80266cef>] state_store+0xaf/0xf0
> > > [<ffffffff8032ca67>] kobj_attr_store+0x17/0x20
> > > [<ffffffff802e459e>] sysfs_write_file+0xce/0x140
> > > [<ffffffff80299cc7>] vfs_write+0xc7/0x170
> > > [<ffffffff8029a360>] sys_write+0x50/0x90
> > > [<ffffffff8020bcde>] system_call+0x7e/0x83
> > >
> > > # LANG=en ll /sys/devices/pnp0/00:06/
> > > total 0
> > > lrwxrwxrwx 1 root root 0 Nov 22 22:35 driver -> ../../../bus/pnp/drivers/serial
> > > -r--r--r-- 1 root root 4096 Nov 22 22:35 id
> > > -r--r--r-- 1 root root 4096 Nov 22 22:35 options
> > > drwxr-xr-x 2 root root 0 Nov 22 22:35 power
> > > -rw-r--r-- 1 root root 4096 Nov 22 22:35 resources
> > > lrwxrwxrwx 1 root root 0 Nov 22 22:35 subsystem -> ../../../bus/pnp
> > > drwxr-xr-x 3 root root 0 Nov 22 22:35 tty
> > > -rw-r--r-- 1 root root 4096 Nov 22 22:35 uevent
> >
> > I suppose that's a genuine leak, presumably in 8250_pnp.
>
> We used to have only the serial driver resource reservation. We now
> have an additional 00:06 resource that is the parent of the serial
> resource, e.g.,
>
> 03f8-03ff : 00:06
> 03f8-03ff : serial
>
> I think this problem happens because pnp_bus_suspend() calls
> serial_pnp_suspend(), which suspends the driver but does nothing
> with the resources. Then it calls pnp_stop_dev(), which releases
> the 00:06 resource, which still has a serial child resource.
>
> The corresponding PCI code in pci_device_suspend() does not do
> any generic device disable or resource release. I don't know
> why PNP disables the device on suspend. I glanced through the
> ACPI spec but didn't see a requirement for it. Maybe Pierre [1]
> remembers.
>
> Maybe we could either remove the pnp_{stop,start}_dev() calls
> from the suspend/resume path, or move the PNP resource management
> out of pnp_{start,stop}_dev().
>
> Bjorn
>
> [1] http://lkml.org/lkml/2005/11/30/39
So was this particular problem caused/exposed by
pnp-request-ioport-and-iomem-resources-used-by-active-devices.patch, or is
it in mainline?
Thanks.
next prev parent reply other threads:[~2007-11-30 0:42 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-22 21:41 WARNING: at kernel/resource.c:189 __release_resource Jiri Slaby
2007-11-27 6:05 ` Andrew Morton
2007-11-27 12:38 ` Matthew Wilcox
2007-11-29 23:40 ` Bjorn Helgaas
2007-11-30 0:42 ` Andrew Morton [this message]
2007-11-30 21:08 ` Bjorn Helgaas
2007-11-30 22:49 ` Jiri Slaby
2007-11-30 22:58 ` Bjorn Helgaas
2007-12-01 8:12 ` Jiri Slaby
2007-12-01 12:00 ` Jiri Slaby
2007-12-05 18:24 ` RFC: PNP: do not stop/start devices in suspend/resume path Bjorn Helgaas
2007-12-05 18:50 ` Matthew Wilcox
2007-12-06 1:07 ` Rafael J. Wysocki
2007-12-06 23:25 ` Bjorn Helgaas
2007-12-12 8:16 ` Andrew Morton
2007-12-12 16:29 ` Bjorn Helgaas
2007-12-13 8:26 ` Pierre Ossman
2007-12-07 7:13 ` RFC: " Shaohua Li
2007-12-10 23:26 ` Bjorn Helgaas
2007-12-24 1:43 ` do not stop/start devices in suspend/resume path: the SCSI case Stephane Ascoet
2007-12-24 3:21 ` Bjorn Helgaas
2007-12-01 21:01 ` WARNING: at kernel/resource.c:189 __release_resource Pierre Ossman
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