[PATCH v4 1/2] PCI: hv: Serialize the present and eject work items

[Dexuan Cui]

> From: Lorenzo Pieralisi <lorenzo.pieralisi at arm.com>
> Sent: Thursday, March 15, 2018 10:02
> On Thu, Mar 15, 2018 at 02:20:53PM +0000, Dexuan Cui wrote:
> > When we hot-remove the device, we first receive a PCI_EJECT message and
> > then receive a PCI_BUS_RELATIONS message with bus_rel->device_count ==
> 0.
> >
> > The first message is offloaded to 	(), and the second
> > is offloaded to pci_devices_present_work(). Both the paths can be running
> > list_del(&hpdev->list_entry), causing general protection fault, because
> > system_wq can run them concurrently.
> >
> > The patch eliminates the race condition.
> >
> > Cc: stable at vger.kernel.org
> 
> I need to know either what commit you are fixing (ie Fixes: tag - which
> is preferrable) or you tell me which kernel versions we are targeting
> for the stable backport.
> 
> Thanks,
> Lorenzo

Sorry.  Here I was hesitant to add a "Fixes:" because the bug was there the first day
when the driver was introduced.

Please use
Fixes: 4daace0d8ce8 ("PCI: hv: Add paravirtual PCI front-end for Microsoft Hyper-V VMs")
or 
Cc: <stable at vger.kernel.org> # v4.6+

Thanks,
-- Dexuan