linux-kernel - Re: [3.11.4] Thunderbolt/PCI unplug oops in pci_pme_list

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Date:	Tue, 19 Nov 2013 09:54:58 +0800
From:	Yijing Wang <wangyijing@...wei.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>
CC:	Yinghai Lu <yinghai@...nel.org>,
	Andreas Noever <andreas.noever@...il.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [3.11.4] Thunderbolt/PCI unplug oops in pci_pme_list_scan

> The pcie_portdrv .probe() method calls pci_enable_device() once, in
> pcie_port_device_register(), but the .remove() method calls
> pci_disable_device() twice, in pcie_port_device_remove() and in
> pcie_portdrv_remove().
> 
> That causes a "disabling already-disabled device" warning when removing a
> PCIe port device.  This happens all the time when removing Thunderbolt
> devices, but is also easy to reproduce with, e.g.,
> "echo 0000:00:1c.3 > /sys/bus/pci/drivers/pcieport/unbind"
> 
> This patch removes the disable from pcie_portdrv_remove().
> 
> [bhelgaas: changelog, tag for stable]
> Reported-by: David Bulkow <David.Bulkow@...atus.com>
> Reported-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> CC: stable@...r.kernel.org	# v2.6.32+

Hi Bjorn,
   This issue in X86 seems to be introduced after commit 928bea9 "PCI: Delay enabling bridges until they're needed"
So this patch needs to back port to 2.6.32+ ?

> ---
>  drivers/pci/pcie/portdrv_pci.c |    1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/pci/pcie/portdrv_pci.c b/drivers/pci/pcie/portdrv_pci.c
> index cd1e57e51aa7..0d8fdc48e642 100644
> --- a/drivers/pci/pcie/portdrv_pci.c
> +++ b/drivers/pci/pcie/portdrv_pci.c
> @@ -223,7 +223,6 @@ static int pcie_portdrv_probe(struct pci_dev *dev,
>  static void pcie_portdrv_remove(struct pci_dev *dev)
>  {
>  	pcie_port_device_remove(dev);
> -	pci_disable_device(dev);
>  }
>  
>  static int error_detected_iter(struct device *device, void *data)
> --
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> .
> 


-- 
Thanks!
Yijing

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