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

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Message-ID: <20130607170706.GB3730@phenom.dumpdata.com>
Date:	Fri, 7 Jun 2013 10:07:06 -0700 (PDT)
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Jiang Liu <liuj97@...il.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Jiang Liu <jiang.liu@...wei.com>,
	"Rafael J . Wysocki" <rjw@...k.pl>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Gu Zheng <guz.fnst@...fujitsu.com>,
	Toshi Kani <toshi.kani@...com>,
	Myron Stowe <myron.stowe@...hat.com>,
	Yijing Wang <wangyijing@...wei.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	xen-devel@...ts.xensource.com,
	virtualization@...ts.linux-foundation.org
Subject: Re: [RFC PATCH v2, part3 07/11] PCI, xen-pcifront: use new PCI
 interfaces to simplify implementation

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.
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