linux-kernel - Re: [RFC PATCH v2, part3 00/11] Introduce PCI bus lock and state machine

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Message-ID: <CAE9FiQW0SeAedgv4eqDVxNvSh6OfcZAnygKYBygZuG4KNvBaRA@mail.gmail.com>
Date:	Mon, 27 May 2013 21:51:43 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Gu Zheng <guz.fnst@...fujitsu.com>
Cc:	Jiang Liu <liuj97@...il.com>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Jiang Liu <jiang.liu@...wei.com>,
	"Rafael J . Wysocki" <rjw@...k.pl>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Toshi Kani <toshi.kani@...com>,
	Myron Stowe <myron.stowe@...hat.com>,
	Yijing Wang <wangyijing@...wei.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v2, part3 00/11] Introduce PCI bus lock and state machine

On Wed, May 22, 2013 at 2:48 AM, Gu Zheng <guz.fnst@...fujitsu.com> wrote:
> On 05/16/2013 11:50 PM, Jiang Liu wrote:
>         We're gladly to see the new patch-set, and I tested all the whole 3 parts
> patch-set on the latest kernel tree. Because of the limitation of our test environment,
> we only use the method *1* to trigger PCI hotplug concurrently, and it works well.
>
> Though I'm not sure whether the way you introduced is the best one to solve these
> race condition issues, but it does fix the concurrent PCI hotplug(via sysfs)
> issues that disturb us.

Not sure what happened, at lease after Jiang's first patch, we should still need
https://patchwork.kernel.org/patch/2562431/
 [1/7] PCI: move back pci_proc_attach_devices calling
https://patchwork.kernel.org/patch/2562461/
 [2/7] PCI: move resources and bus_list releasing to pci_release_dev
https://patchwork.kernel.org/patch/2562451/
 [3/7] PCI: Detach driver in pci_stop_device

they will allow pci_stop_and_remove_bus_device is called two times in the
your case.

this one is not needed.
https://patchwork.kernel.org/patch/2562561/
  [4/7] PCI: Fix racing for pci device removing via sysfs
it should be the same as the two pci_alloc_dev patches.

other three are about sriov one....

Thanks

Yinghai
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