linux-kernel - Re: [ 061/184] PCI/PM: Clean up PME state when removing a device

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Date:	Fri, 07 Jun 2013 05:23:56 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Willy Tarreau <w@....eu>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [ 061/184] PCI/PM: Clean up PME state when removing a device

On Tue, 2013-06-04 at 19:22 +0200, Willy Tarreau wrote:
> 2.6.32-longterm review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: "Rafael J. Wysocki" <rjw@...k.pl>
> 
> commit 249bfb83cf8ba658955f0245ac3981d941f746ee upstream.
> 
> Devices are added to pci_pme_list when drivers use pci_enable_wake()
> or pci_wake_from_d3(), but they aren't removed from the list unless
> the driver explicitly disables wakeup.  Many drivers never disable
> wakeup, so their devices remain on the list even after they are
> removed, e.g., via hotplug.  A subsequent PME poll will oops when
> it tries to touch the device.
> 
> This patch disables PME# on a device before removing it, which removes
> the device from pci_pme_list.  This is safe even if the device never
> had PME# enabled.

There's no such list in 2.6.32, so I don't think this is needed.

Ben.

> This oops can be triggered by unplugging a Thunderbolt ethernet adapter
> on a Macbook Pro, as reported by Daniel below.
> 
> [bhelgaas: changelog]
> Reference: http://lkml.kernel.org/r/CAMVG2svG21yiM1wkH4_2pen2n+cr2-Zv7TbH3Gj+8MwevZjDbw@mail.gmail.com
> Reported-and-tested-by: Daniel J Blueman <daniel@...ra.org>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Signed-off-by: Willy Tarreau <w@....eu>
> ---
>  drivers/pci/remove.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
> index 176615e..27ae1f9 100644
> --- a/drivers/pci/remove.c
> +++ b/drivers/pci/remove.c
> @@ -19,6 +19,8 @@ static void pci_free_resources(struct pci_dev *dev)
>  
>  static void pci_stop_dev(struct pci_dev *dev)
>  {
> +	pci_pme_active(dev, false);
> +
>  	if (dev->is_added) {
>  		pci_proc_detach_device(dev);
>  		pci_remove_sysfs_dev_files(dev);

-- 
Ben Hutchings
Theory and practice are closer in theory than in practice.
                                - John Levine, moderator of comp.compilers

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