linux-kernel - Re: [PATCH v2 19/37] PCI: Add pci_stop_and_remove

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Date:	Mon, 12 Mar 2012 23:58:09 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Jesse Barnes <jbarnes@...tuousgeek.org>, x86 <x86@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 19/37] PCI: Add pci_stop_and_remove_bus()

On 03/10/2012 03:00 PM, Yinghai Lu wrote:
> It supports both pci root bus and pci bus under pci bridge.
> 
> -v2: clear pci_bridge's subordinate.
> 
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> ---
>  drivers/pci/remove.c |   32 ++++++++++++++++++++++++++++++++
>  include/linux/pci.h  |    1 +
>  2 files changed, 33 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
> index d4fdf7b..9ffc071 100644
> --- a/drivers/pci/remove.c
> +++ b/drivers/pci/remove.c
> @@ -170,6 +170,38 @@ void pci_stop_bus_device(struct pci_dev *dev)
>  	pci_stop_dev(dev);
>  }
>  
> +static void pci_stop_host_bridge(struct pci_host_bridge *bridge)
> +{
> +	device_unregister(&bridge->dev);
> +}
> +/*
> + * it will support pci root bus too, in that case we need
> + *  stop and remove host bridge
> + */
> +void pci_stop_and_remove_bus(struct pci_bus *bus)
> +{
> +	struct pci_host_bridge *host_bridge = NULL;
> +	struct pci_dev *pci_bridge = NULL;
> +
> +	pci_stop_bus_devices(bus);
> +
> +	if (pci_is_root_bus(bus)) {
> +		host_bridge = to_pci_host_bridge(bus->bridge);
> +		pci_stop_host_bridge(host_bridge);
> +	} else
> +		pci_bridge = bus->self;
> +
> +	__pci_remove_bus_devices(bus);
> +
> +	pci_remove_bus(bus);
> +
It seems that the bus and host_bridge structures may have already been freed here,
so should not access host_bridge structure any more.
> +	if (host_bridge)
> +		host_bridge->bus = NULL;
> +
> +	if (pci_bridge)
> +		pci_bridge->subordinate = NULL;
> +}
> +
>  EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
>  EXPORT_SYMBOL(pci_stop_and_remove_behind_bridge);
>  EXPORT_SYMBOL_GPL(pci_stop_bus_device);
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 860091f..8874b90 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -702,6 +702,7 @@ extern void pci_dev_put(struct pci_dev *dev);
>  extern void pci_remove_bus(struct pci_bus *b);
>  extern void __pci_remove_bus_device(struct pci_dev *dev);
>  extern void pci_stop_and_remove_bus_device(struct pci_dev *dev);
> +void pci_stop_and_remove_bus(struct pci_bus *bus);
>  extern void pci_stop_bus_device(struct pci_dev *dev);
>  void pci_setup_cardbus(struct pci_bus *bus);
>  extern void pci_sort_breadthfirst(void);

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