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SubjectRe: [PATCH v2 1/3] PCI: endpoint: Add 'started' to pci_epc to set whether the controller is started
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Hi Kishon,

On 2021/01/28 23:11, Kishon Vijay Abraham I wrote:
> Hi Kunihiko,
>
> On 24/01/21 8:39 pm, Kunihiko Hayashi wrote:
>> This adds a member 'started' as a boolean value to struct pci_epc to set
>> whether the controller is started, and also adds a function to get the
>> value.
>>
>> Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
>> ---
>> drivers/pci/endpoint/pci-epc-core.c | 2 ++
>> include/linux/pci-epc.h | 7 +++++++
>> 2 files changed, 9 insertions(+)
>>
>> diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c
>> index cc8f9eb..2904175 100644
>> --- a/drivers/pci/endpoint/pci-epc-core.c
>> +++ b/drivers/pci/endpoint/pci-epc-core.c
>> @@ -174,6 +174,7 @@ void pci_epc_stop(struct pci_epc *epc)
>>
>> mutex_lock(&epc->lock);
>> epc->ops->stop(epc);
>> + epc->started = false;
>> mutex_unlock(&epc->lock);
>> }
>> EXPORT_SYMBOL_GPL(pci_epc_stop);
>> @@ -196,6 +197,7 @@ int pci_epc_start(struct pci_epc *epc)
>>
>> mutex_lock(&epc->lock);
>> ret = epc->ops->start(epc);
>> + epc->started = true;
>> mutex_unlock(&epc->lock);
>>
>> return ret;
>> diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h
>> index b82c9b1..5808952 100644
>> --- a/include/linux/pci-epc.h
>> +++ b/include/linux/pci-epc.h
>> @@ -131,6 +131,7 @@ struct pci_epc_mem {
>> * @lock: mutex to protect pci_epc ops
>> * @function_num_map: bitmap to manage physical function number
>> * @notifier: used to notify EPF of any EPC events (like linkup)
>> + * @started: true if this EPC is started
>> */
>> struct pci_epc {
>> struct device dev;
>> @@ -145,6 +146,7 @@ struct pci_epc {
>> struct mutex lock;
>> unsigned long function_num_map;
>> struct atomic_notifier_head notifier;
>> + bool started;
>> };
>>
>> /**
>> @@ -191,6 +193,11 @@ pci_epc_register_notifier(struct pci_epc *epc, struct notifier_block *nb)
>> return atomic_notifier_chain_register(&epc->notifier, nb);
>> }
>>
>> +static inline bool pci_epc_is_started(struct pci_epc *epc)
>> +{
>> + return epc->started;
>> +}
>
> This should also be protected.

Ok, I prepared this function for restart management in patch 2/3.
This also needs to be reconsidered.

Thank you,

---
Best Regards
Kunihiko Hayashi

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