From 0c6045d8c0eff0f7784f310407ccad44f622aa40 Mon Sep 17 00:00:00 2001 From: Dexuan Cui Date: Tue, 23 Aug 2016 04:45:51 +0000 Subject: [PATCH] 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 Signed-off-by: Bjorn Helgaas Acked-by: KY Srinivasan CC: Jake Oshins CC: Haiyang Zhang CC: Vitaly Kuznetsov --- drivers/pci/host/pci-hyperv.c | 42 +++++++++++++++++------------------ 1 file changed, 20 insertions(+), 22 deletions(-) diff --git a/drivers/pci/host/pci-hyperv.c b/drivers/pci/host/pci-hyperv.c index a8deeca984cf..6fa40f111962 100644 --- a/drivers/pci/host/pci-hyperv.c +++ b/drivers/pci/host/pci-hyperv.c @@ -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 = ∁ 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), -- 2.20.1