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Message-ID: <1348204383.23395.22.camel@yhuang-dev>
Subject: Re: [PATCH v4 3/5] PCI/AER: clean all untracked pci_ops_aer when
 rmmod aer_inject
From: Huang Ying <ying.huang@intel.com>
To: Yijing Wang <wangyijing@huawei.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
	Chen Gong <gong.chen@linux.intel.com>, jiang.liu@huawei.com,
	Hanjun Guo <guohanjun@huawei.com>, linux-pci@vger.kernel.org
Date: Fri, 21 Sep 2012 13:13:03 +0800
In-Reply-To: <1348199056-7696-4-git-send-email-wangyijing@huawei.com>
References: <1348199056-7696-1-git-send-email-wangyijing@huawei.com>
	 <1348199056-7696-4-git-send-email-wangyijing@huawei.com>
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On Fri, 2012-09-21 at 11:44 +0800, Yijing Wang wrote:
> When we do hot plug for pci devices that were injected aer errors, some newly created child buses'
> pci_ops will be assigned to pci_ops_aer. Aer_inject module will not track these pci_ops_aer(not
> list in pci_bus_ops_list),so we should clean all of these when rmmod aer_inject module.
> 
> Signed-off-by: Yijing Wang <wangyijing@huawei.com>
> Signed-off-by: Huang Ying <ying.huang@intel.com>
> ---
>  drivers/pci/pcie/aer/aer_inject.c |   24 ++++++++++++++++++++++++
>  1 files changed, 24 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/pci/pcie/aer/aer_inject.c b/drivers/pci/pcie/aer/aer_inject.c
> index 0123120..e04cf24 100644
> --- a/drivers/pci/pcie/aer/aer_inject.c
> +++ b/drivers/pci/pcie/aer/aer_inject.c
> @@ -299,6 +299,29 @@ static void pci_bus_ops_init(struct pci_bus_ops *bus_ops,
>  	bus_ops->ops = ops;
>  }
>  
> +static void pci_clean_child_aer_ops(struct pci_bus *bus)
> +{
> +	struct pci_bus *child;
> +
> +	list_for_each_entry(child, &bus->children, node) {
> +		if (child->ops == &pci_ops_aer)
> +			pci_bus_set_ops(child, bus->ops);
> +		pci_clean_child_aer_ops(child);
> +	}
> +}
> +
> +/* find pci_ops_aer from root bus, and replace it by parent bus's pci_ops.
> + * pci_ops of root bus won't be pci_ops_aer here*/
> +static void clean_untracked_pci_ops_aer(void)
> +{
> +	struct pci_bus_ops *bus_ops;
> +
> +	list_for_each_entry(bus_ops, &pci_bus_ops_list, list) {
> +		if (pci_is_root_bus(bus_ops->bus))

Why do cleanup only for root bus?

Best Regards,
Huang Ying

> +			pci_clean_child_aer_ops(bus_ops->bus);
> +	}
> +}
> +
>  static int pci_bus_set_aer_ops(struct pci_bus *bus)
>  {
>  	struct pci_ops *ops;
> @@ -560,6 +583,7 @@ static void __exit aer_inject_exit(void)
>  	while ((bus_ops = pci_bus_ops_get(bus_ops)))
>  		pci_bus_set_ops(bus_ops->bus, bus_ops->ops);
>  
> +	clean_untracked_pci_ops_aer();
>  	while ((bus_ops = pci_bus_ops_pop()))
>  		kfree(bus_ops);
>