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SubjectRE: [EXTERNAL] [PATCH 1/2] PCI: hv: decouple the func definition in hv_dr_state from VSP message
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>Subject: RE: [EXTERNAL] [PATCH 1/2] PCI: hv: decouple the func definition in
>hv_dr_state from VSP message
>
>> From: linux-hyperv-owner@vger.kernel.org
>> Sent: Friday, November 22, 2019 5:57 PM ...
>> +struct hv_pcidev_description {
>> + u16 v_id; /* vendor ID */
>> + u16 d_id; /* device ID */
>> + u8 rev;
>> + u8 prog_intf;
>> + u8 subclass;
>> + u8 base_class;
>> + u32 subsystem_id;
>> + union win_slot_encoding win_slot;
>
>Change the spact to a TAB? :-)
>
>> /**
>> - * hv_pci_devices_present() - Handles list of new children
>> + * hv_pci_start_relations_work() - Queue work to start device
>> + discovery
>> * @hbus: Root PCI bus, as understood by this driver
>> - * @relations: Packet from host listing children
>> + * @dr: The list of children returned from host
>> *
>> - * This function is invoked whenever a new list of devices for
>> - * this bus appears.
>> + * Return: 0 on success, 1 on failure
>> */
>
>Usually we return a negative value upon error, if possible.
>
>> -static void hv_pci_devices_present(struct hv_pcibus_device *hbus,
>> - struct pci_bus_relations *relations)
>> +static int hv_pci_start_relations_work(struct hv_pcibus_device *hbus,
>> + struct hv_dr_state *dr)
>> {
>> - struct hv_dr_state *dr;
>> struct hv_dr_work *dr_wrk;
>> - unsigned long flags;
>> bool pending_dr;
>> + unsigned long flags;
>>
>> dr_wrk = kzalloc(sizeof(*dr_wrk), GFP_NOWAIT);
>> if (!dr_wrk)
>> - return;
>> -
>> - dr = kzalloc(offsetof(struct hv_dr_state, func) +
>> - (sizeof(struct pci_function_description) *
>> - (relations->device_count)), GFP_NOWAIT);
>> - if (!dr) {
>> - kfree(dr_wrk);
>> - return;
>> - }
>> + return 1;
>
>How about "return -ENOMEM;" ?
>
>> @@ -3018,7 +3055,7 @@ static void hv_pci_bus_exit(struct hv_device
>*hdev)
>> struct pci_packet teardown_packet;
>> u8 buffer[sizeof(struct pci_message)];
>> } pkt;
>> - struct pci_bus_relations relations;
>> + struct hv_dr_state *dr;
>> struct hv_pci_compl comp_pkt;
>> int ret;
>>
>> @@ -3030,8 +3067,9 @@ static void hv_pci_bus_exit(struct hv_device
>*hdev)
>> return;
>>
>> /* Delete any children which might still exist. */
>> - memset(&relations, 0, sizeof(relations));
>> - hv_pci_devices_present(hbus, &relations);
>> + dr = kzalloc(sizeof(*dr), GFP_ATOMIC);
>
>Here we are in a process context, so GFP_KERNEL is preferred.
>
>> + if (dr && hv_pci_start_relations_work(hbus, dr))
>> + kfree(dr);
>
>Thanks,
>-- Dexuan

Thanks! I will send v2 to address those comments.

Long

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