From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Huang Ying <ying.huang@intel.com>
Cc: Ben Hutchings <ben@decadent.org.uk>,
linux-kernel@vger.kernel.org, stable@vger.kernel.org,
alan@lxorguk.ukuu.org.uk, Bjorn Helgaas <bhelgaas@google.com>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
Zhang Yanmin <yanmin.zhang@intel.com>
Subject: Re: [ 02/38] PCI/PM: Fix deadlock when unbinding device if parent in D3cold
Date: Mon, 26 Nov 2012 11:08:18 -0800 [thread overview]
Message-ID: <20121126190818.GA22409@kroah.com> (raw)
In-Reply-To: <20121126185505.GE21012@kroah.com>
On Mon, Nov 26, 2012 at 10:55:05AM -0800, Greg Kroah-Hartman wrote:
> On Fri, Nov 23, 2012 at 11:09:37AM +0800, Huang Ying wrote:
> > On Fri, 2012-11-23 at 02:35 +0000, Ben Hutchings wrote:
> > > On Wed, 2012-11-21 at 16:39 -0800, Greg Kroah-Hartman wrote:
> > > > 3.0-stable review patch. If anyone has any objections, please let me know.
> > > >
> > > > ------------------
> > > >
> > > > From: Huang Ying <ying.huang@intel.com>
> > > >
> > > > commit 90b5c1d7c45eeb622302680ff96ed30c1a2b6f0e upstream.
> > > >
> > > > If a PCI device and its parents are put into D3cold, unbinding the
> > > > device will trigger deadlock as follow:
> > > >
> > > > - driver_unbind
> > > > - device_release_driver
> > > > - device_lock(dev) <--- previous lock here
> > > > - __device_release_driver
> > > > - pm_runtime_get_sync
> > > > ...
> > > > - rpm_resume(dev)
> > > > - rpm_resume(dev->parent)
> > > > ...
> > > > - pci_pm_runtime_resume
> > > > ...
> > > > - pci_set_power_state
> > > > - __pci_start_power_transition
> > > > - pci_wakeup_bus(dev->parent->subordinate)
> > > > - pci_walk_bus
> > > > - device_lock(dev) <--- deadlock here
> > > >
> > > >
> > > > If we do not do device_lock in pci_walk_bus, we can avoid deadlock.
> > > > Device_lock in pci_walk_bus is introduced in commit:
> > > > d71374dafbba7ec3f67371d3b7e9f6310a588808, corresponding email thread
> > > > is: https://lkml.org/lkml/2006/5/26/38. The patch author Zhang Yanmin
> > > > said device_lock is added to pci_walk_bus because:
> > > >
> > > > Some error handling functions call pci_walk_bus. For example, PCIe
> > > > aer. Here we lock the device, so the driver wouldn't detach from the
> > > > device, as the cb might call driver's callback function.
> > > >
> > > > So I fixed the deadlock as follows:
> > > >
> > > > - remove device_lock from pci_walk_bus
> > > > - add device_lock into callback if callback will call driver's callback
> > > >
> > > > I checked pci_walk_bus users one by one, and found only PCIe aer needs
> > > > device lock.
> > > [...]
> > >
> > > What about eeh_report_error() in
> > > arch/powerpc/platforms/pseries/eeh_driver.c?
> >
> > En... Because pci_walk_bus() invocation is removed in 3.7, so this
> > patch is only valid for 3.7. We need another version for 3.6.
> >
> > > Also, is the deadlock even possible before this change in Linux 3.6?
> > >
> > > commit 448bd857d48e69b33ef323739dc6d8ca20d4cda7
> > > Author: Huang Ying <ying.huang@intel.com>
> > > Date: Sat Jun 23 10:23:51 2012 +0800
> > >
> > > PCI/PM: add PCIe runtime D3cold support
> >
> > Before this, there will be no deadlock. So we do not need fixes before
> > Linux 3.6.
>
> So the first patch mentioned here should not be included in the 3.0 and
> 3.4 stable kernel releases?
Ok, I've dropped the patch from 3.0 and 3.4-stable trees now.
For 3.6, what should I do?
thanks,
greg k-h
next prev parent reply other threads:[~2012-11-26 19:08 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20121122003904.262382971@linuxfoundation.org>
2012-11-22 0:39 ` [ 01/38] mm: bugfix: set current->reclaim_state to NULL while returning from kswapd() Greg Kroah-Hartman
2012-11-22 0:39 ` [ 02/38] PCI/PM: Fix deadlock when unbinding device if parent in D3cold Greg Kroah-Hartman
2012-11-23 2:35 ` Ben Hutchings
2012-11-23 3:09 ` Huang Ying
2012-11-23 7:47 ` Huang Ying
2012-11-30 2:01 ` Greg Kroah-Hartman
2012-11-30 2:54 ` Huang Ying
2012-12-11 8:12 ` Huang Ying
2012-12-11 18:08 ` Greg Kroah-Hartman
2012-12-14 7:08 ` Huang Ying
2012-12-14 21:56 ` Greg Kroah-Hartman
2012-11-26 18:55 ` Greg Kroah-Hartman
2012-11-26 19:08 ` Greg Kroah-Hartman [this message]
2012-11-26 19:30 ` Greg Kroah-Hartman
2012-11-27 0:28 ` Huang Ying
2012-11-22 0:39 ` [ 03/38] fanotify: fix missing break Greg Kroah-Hartman
2012-11-22 0:39 ` [ 04/38] crypto: cryptd - disable softirqs in cryptd_queue_worker to prevent data corruption Greg Kroah-Hartman
2012-11-22 0:39 ` [ 05/38] ptp: update adjfreq callback description Greg Kroah-Hartman
2012-11-24 0:26 ` Herton Ronaldo Krzesinski
2012-11-26 18:46 ` Greg Kroah-Hartman
2012-11-26 21:19 ` Keller, Jacob E
2012-11-22 0:39 ` [ 06/38] ALSA: hda: Cirrus: Fix coefficient index for beep configuration Greg Kroah-Hartman
2012-11-22 0:39 ` [ 07/38] ALSA: hda - Force to reset IEC958 status bits for AD codecs Greg Kroah-Hartman
2012-11-22 0:39 ` [ 08/38] ASoC: wm8978: pll incorrectly configured when codec is master Greg Kroah-Hartman
2012-11-22 0:39 ` [ 09/38] ASoC: dapm: Use card_list during DAPM shutdown Greg Kroah-Hartman
2012-11-22 0:39 ` [ 10/38] UBIFS: fix mounting problems after power cuts Greg Kroah-Hartman
2012-11-22 0:39 ` [ 11/38] UBIFS: introduce categorized lprops counter Greg Kroah-Hartman
2012-11-22 0:39 ` [ 12/38] s390/gup: add missing TASK_SIZE check to get_user_pages_fast() Greg Kroah-Hartman
2012-11-22 0:39 ` [ 13/38] USB: option: add Novatel E362 and Dell Wireless 5800 USB IDs Greg Kroah-Hartman
2012-11-22 0:39 ` [ 14/38] USB: option: add Alcatel X220/X500D " Greg Kroah-Hartman
2012-11-22 0:39 ` [ 15/38] wireless: allow 40 MHz on world roaming channels 12/13 Greg Kroah-Hartman
2012-11-22 0:39 ` [ 16/38] m68k: fix sigset_t accessor functions Greg Kroah-Hartman
2012-11-22 0:40 ` [ 17/38] ipv4: avoid undefined behavior in do_ip_setsockopt() Greg Kroah-Hartman
2012-11-22 0:40 ` [ 18/38] ipv6: setsockopt(IPIPPROTO_IPV6, IPV6_MINHOPCOUNT) forgot to set return value Greg Kroah-Hartman
2012-11-22 0:40 ` [ 19/38] net: correct check in dev_addr_del() Greg Kroah-Hartman
2012-11-22 0:40 ` [ 20/38] net-rps: Fix brokeness causing OOO packets Greg Kroah-Hartman
2012-11-22 0:40 ` [ 21/38] r8169: use unlimited DMA burst for TX Greg Kroah-Hartman
2012-11-22 0:40 ` [ 22/38] kbuild: Fix gcc -x syntax Greg Kroah-Hartman
2012-11-22 0:40 ` [ 23/38] netfilter: Validate the sequence number of dataless ACK packets as well Greg Kroah-Hartman
2012-11-22 0:40 ` [ 24/38] netfilter: Mark SYN/ACK packets as invalid from original direction Greg Kroah-Hartman
2012-11-22 0:40 ` [ 25/38] netfilter: nf_nat: dont check for port change on ICMP tuples Greg Kroah-Hartman
2012-11-22 0:40 ` [ 26/38] usb: use usb_serial_put in usb_serial_probe errors Greg Kroah-Hartman
2012-11-22 0:40 ` [ 27/38] eCryptfs: Copy up POSIX ACL and read-only flags from lower mount Greg Kroah-Hartman
2012-11-22 0:40 ` [ 28/38] eCryptfs: check for eCryptfs cipher support at mount Greg Kroah-Hartman
2012-11-22 0:40 ` [ 29/38] sky2: Fix for interrupt handler Greg Kroah-Hartman
2012-11-22 0:40 ` [ 30/38] drm/i915: fix overlay on i830M Greg Kroah-Hartman
2012-11-22 0:40 ` [ 31/38] NFS: Wait for session recovery to finish before returning Greg Kroah-Hartman
2012-11-22 0:40 ` [ 32/38] reiserfs: Fix lock ordering during remount Greg Kroah-Hartman
2012-11-22 0:40 ` [ 33/38] reiserfs: Protect reiserfs_quota_on() with write lock Greg Kroah-Hartman
2012-11-22 0:40 ` [ 34/38] reiserfs: Move quota calls out of " Greg Kroah-Hartman
2012-11-22 0:40 ` [ 35/38] reiserfs: Protect reiserfs_quota_write() with " Greg Kroah-Hartman
2012-11-22 0:40 ` [ 36/38] selinux: fix sel_netnode_insert() suspicious rcu dereference Greg Kroah-Hartman
2012-11-22 0:40 ` [ 37/38] PCI : ability to relocate assigned pci-resources Greg Kroah-Hartman
2012-11-23 13:29 ` Herton Ronaldo Krzesinski
[not found] ` <20121124014141.GD2752@ram.oc3035372033.ibm.com>
2012-11-26 18:53 ` Greg Kroah-Hartman
2012-11-22 0:40 ` [ 38/38] PCI : Calculate right add_size Greg Kroah-Hartman
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