Re: [RFC PATCH v2, part3 07/11] PCI, xen-pcifront: use new PCI interfaces to simplify implementation

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Sat, Jun 08, 2013 at 12:50:31AM +0800, Jiang Liu wrote:
> On 06/07/2013 11:38 PM, Konrad Rzeszutek Wilk wrote:
> > On Fri, Jun 07, 2013 at 10:50:24AM -0400, Konrad Rzeszutek Wilk wrote:
> >> On Thu, May 16, 2013 at 11:50:55PM +0800, Jiang Liu wrote:
> >>> Use new PCI interfaces to simplify xen-pcifront implementation:
> >>> 1) Use pci_create_root_bus() instead of pci_scan_bus_parented()
> >>>    because pci_scan_bus_parented() is marked as __deprecated.This
> >>>    also gets rid of a duplicated call of pci_bus_start_devices().
> >>> 2) Use pci_stop_root_bus() and pci_remove_root_bus() instead of
> >>>    open-coded private implementation.
> >>> 3) Use pci_set_host_bridge_release() to release data structures
> >>>    associated with PCI root buses.
> >>> 4) Use pci_bus_get()/pci_bus_put() to manage PCI root bus reference
> >>>    count.
> >>>
> >>> This is also a preparation for coming PCI bus lock enhancement.
> > 
> > With this patch from :
> > 
> >  Merge branch 'pci_lock_v3' of https://github.com/jiangliu/linux into testing
> > 
> > 
> > it blows up when detaching the device.
> Hi Konrad,
>    Thanks for testing! According to the log messages, this issue should
> be related to pci bus reference counter management. Seems we have done
> an extra(unbalanced) release of pci bus device.
>    Will investigate it tomorrow!

That is quite commendable that you are willing to look over this on
the weekend but I am not going to be able to rerun this test until
some time in the week. You could enjoy the weekend and just look at
this during the week.