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PCI: hv: Use zero-length array in struct pci_packet 

Use zero-length array in struct pci_packet and rename struct pci_message's
field "message_type" to "type".  This makes the code more readable.

No functionality change.

Signed-off-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: KY Srinivasan <kys@microsoft.com>
CC: Jake Oshins <jakeo@microsoft.com>
CC: Haiyang Zhang <haiyangz@microsoft.com>
CC: Vitaly Kuznetsov <vkuznets@redhat.com>
This commit is contained in:
Dexuan Cui 2016-08-23 04:45:51 +00:00 committed by Bjorn Helgaas
parent 4f1cb01a78
commit 0c6045d8c0
1 changed files with 20 additions and 22 deletions
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42
drivers/pci/host/pci-hyperv.c
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@ -200,11 +200,11 @@ struct tran_int_desc {
*/
struct pci_message {
u32 message_type;
u32 type;
} __packed;
struct pci_child_message {
u32 message_type;
struct pci_message message_type;
union win_slot_encoding wslot;
} __packed;
@ -222,7 +222,8 @@ struct pci_packet {
void (*completion_func)(void *context, struct pci_response *resp,
int resp_packet_size);
void *compl_ctxt;
struct pci_message message;
struct pci_message message[0];
};
/*
@ -314,7 +315,7 @@ struct pci_dev_incoming {
} __packed;
struct pci_eject_response {
u32 message_type;
struct pci_message message_type;
union win_slot_encoding wslot;
u32 status;
} __packed;
@ -694,13 +695,12 @@ static void hv_int_desc_free(struct hv_pci_dev *hpdev,
struct pci_delete_interrupt *int_pkt;
struct {
struct pci_packet pkt;
u8 buffer[sizeof(struct pci_delete_interrupt) -
sizeof(struct pci_message)];
u8 buffer[sizeof(struct pci_delete_interrupt)];
} ctxt;
memset(&ctxt, 0, sizeof(ctxt));
int_pkt = (struct pci_delete_interrupt *)&ctxt.pkt.message;
int_pkt->message_type.message_type =
int_pkt->message_type.type =
PCI_DELETE_INTERRUPT_MESSAGE;
int_pkt->wslot.slot = hpdev->desc.win_slot.slot;
int_pkt->int_desc = *int_desc;
@ -847,8 +847,7 @@ static void hv_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
struct cpumask *affinity;
struct {
struct pci_packet pkt;
u8 buffer[sizeof(struct pci_create_interrupt) -
sizeof(struct pci_message)];
u8 buffer[sizeof(struct pci_create_interrupt)];
} ctxt;
int cpu;
int ret;
@ -876,7 +875,7 @@ static void hv_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
ctxt.pkt.completion_func = hv_pci_compose_compl;
ctxt.pkt.compl_ctxt = &comp;
int_pkt = (struct pci_create_interrupt *)&ctxt.pkt.message;
int_pkt->message_type.message_type = PCI_CREATE_INTERRUPT_MESSAGE;
int_pkt->message_type.type = PCI_CREATE_INTERRUPT_MESSAGE;
int_pkt->wslot.slot = hpdev->desc.win_slot.slot;
int_pkt->int_desc.vector = cfg->vector;
int_pkt->int_desc.vector_count = 1;
@ -1289,7 +1288,7 @@ static struct hv_pci_dev *new_pcichild_device(struct hv_pcibus_device *hbus,
pkt.init_packet.compl_ctxt = &comp_pkt;
pkt.init_packet.completion_func = q_resource_requirements;
res_req = (struct pci_child_message *)&pkt.init_packet.message;
res_req->message_type = PCI_QUERY_RESOURCE_REQUIREMENTS;
res_req->message_type.type = PCI_QUERY_RESOURCE_REQUIREMENTS;
res_req->wslot.slot = desc->win_slot.slot;
ret = vmbus_sendpacket(hbus->hdev->channel, res_req,
@ -1557,8 +1556,7 @@ static void hv_eject_device_work(struct work_struct *work)
int wslot;
struct {
struct pci_packet pkt;
u8 buffer[sizeof(struct pci_eject_response) -
sizeof(struct pci_message)];
u8 buffer[sizeof(struct pci_eject_response)];
} ctxt;
hpdev = container_of(work, struct hv_pci_dev, wrk);
@ -1584,7 +1582,7 @@ static void hv_eject_device_work(struct work_struct *work)
memset(&ctxt, 0, sizeof(ctxt));
ejct_pkt = (struct pci_eject_response *)&ctxt.pkt.message;
ejct_pkt->message_type = PCI_EJECTION_COMPLETE;
ejct_pkt->message_type.type = PCI_EJECTION_COMPLETE;
ejct_pkt->wslot.slot = hpdev->desc.win_slot.slot;
vmbus_sendpacket(hpdev->hbus->hdev->channel, ejct_pkt,
sizeof(*ejct_pkt), (unsigned long)&ctxt.pkt,
@ -1687,7 +1685,7 @@ static void hv_pci_onchannelcallback(void *context)
case VM_PKT_DATA_INBAND:
new_message = (struct pci_incoming_message *)buffer;
switch (new_message->message_type.message_type) {
switch (new_message->message_type.type) {
case PCI_BUS_RELATIONS:
bus_rel = (struct pci_bus_relations *)buffer;
@ -1718,7 +1716,7 @@ static void hv_pci_onchannelcallback(void *context)
default:
dev_warn(&hbus->hdev->device,
"Unimplemented protocol message %x\n",
new_message->message_type.message_type);
new_message->message_type.type);
break;
}
break;
@ -1771,7 +1769,7 @@ static int hv_pci_protocol_negotiation(struct hv_device *hdev)
pkt->completion_func = hv_pci_generic_compl;
pkt->compl_ctxt = &comp_pkt;
version_req = (struct pci_version_request *)&pkt->message;
version_req->message_type.message_type = PCI_QUERY_PROTOCOL_VERSION;
version_req->message_type.type = PCI_QUERY_PROTOCOL_VERSION;
version_req->protocol_version = PCI_PROTOCOL_VERSION_CURRENT;
ret = vmbus_sendpacket(hdev->channel, version_req,
@ -1972,7 +1970,7 @@ static int hv_pci_enter_d0(struct hv_device *hdev)
pkt->completion_func = hv_pci_generic_compl;
pkt->compl_ctxt = &comp_pkt;
d0_entry = (struct pci_bus_d0_entry *)&pkt->message;
d0_entry->message_type.message_type = PCI_BUS_D0ENTRY;
d0_entry->message_type.type = PCI_BUS_D0ENTRY;
d0_entry->mmio_base = hbus->mem_config->start;
ret = vmbus_sendpacket(hdev->channel, d0_entry, sizeof(*d0_entry),
@ -2018,7 +2016,7 @@ static int hv_pci_query_relations(struct hv_device *hdev)
return -ENOTEMPTY;
memset(&message, 0, sizeof(message));
message.message_type = PCI_QUERY_BUS_RELATIONS;
message.type = PCI_QUERY_BUS_RELATIONS;
ret = vmbus_sendpacket(hdev->channel, &message, sizeof(message),
0, VM_PKT_DATA_INBAND, 0);
@ -2071,8 +2069,8 @@ static int hv_send_resources_allocated(struct hv_device *hdev)
init_completion(&comp_pkt.host_event);
pkt->completion_func = hv_pci_generic_compl;
pkt->compl_ctxt = &comp_pkt;
pkt->message.message_type = PCI_RESOURCES_ASSIGNED;
res_assigned = (struct pci_resources_assigned *)&pkt->message;
res_assigned->message_type.type = PCI_RESOURCES_ASSIGNED;
res_assigned->wslot.slot = hpdev->desc.win_slot.slot;
put_pcichild(hpdev, hv_pcidev_ref_by_slot);
@ -2122,7 +2120,7 @@ static int hv_send_resources_released(struct hv_device *hdev)
continue;
memset(&pkt, 0, sizeof(pkt));
pkt.message_type = PCI_RESOURCES_RELEASED;
pkt.message_type.type = PCI_RESOURCES_RELEASED;
pkt.wslot.slot = hpdev->desc.win_slot.slot;
put_pcichild(hpdev, hv_pcidev_ref_by_slot);
@ -2289,7 +2287,7 @@ static int hv_pci_remove(struct hv_device *hdev)
init_completion(&comp_pkt.host_event);
pkt.teardown_packet.completion_func = hv_pci_generic_compl;
pkt.teardown_packet.compl_ctxt = &comp_pkt;
pkt.teardown_packet.message.message_type = PCI_BUS_D0EXIT;
pkt.teardown_packet.message[0].type = PCI_BUS_D0EXIT;
ret = vmbus_sendpacket(hdev->channel, &pkt.teardown_packet.message,
sizeof(struct pci_message),