qdev: Drop qbus_set_hotplug_handler() parameter @errp

qbus_set_hotplug_handler() is a simple wrapper around
object_property_set_link().

object_property_set_link() fails when the property doesn't exist, is
not settable, or its .check() method fails.  These are all programming
errors here, so passing &error_abort to qbus_set_hotplug_handler() is
appropriate.

Most of its callers do.  Exceptions:

* pcie_cap_slot_init(), shpc_init(), spapr_phb_realize() pass NULL,
  i.e. they ignore errors.

* spapr_machine_init() passes &error_fatal.

* s390_pcihost_realize(), virtio_serial_device_realize(),
  s390_pcihost_plug() pass the error to their callers.  The latter two
  keep going after the error, which looks wrong.

Drop the @errp parameter, and instead pass &error_abort to
object_property_set_link().

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Daniel P. Berrangé" <berrange@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20200630090351.1247703-15-armbru@redhat.com>

hw/acpi/pcihp.c

@@ -246,8 +246,7 @@ void acpi_pcihp_device_plug_cb(HotplugHandler *hotplug_dev, AcpiPciHpState *s,
             object_dynamic_cast(OBJECT(dev), TYPE_PCI_BRIDGE)) {
             PCIBus *sec = pci_bridge_get_sec_bus(PCI_BRIDGE(pdev));
 
-            qbus_set_hotplug_handler(BUS(sec), OBJECT(hotplug_dev),
-                                     &error_abort);
+            qbus_set_hotplug_handler(BUS(sec), OBJECT(hotplug_dev));
             /* We don't have to overwrite any other hotplug handler yet */
             assert(QLIST_EMPTY(&sec->child));
         }

hw/acpi/piix4.c

@@ -506,7 +506,7 @@ static void piix4_pm_realize(PCIDevice *dev, Error **errp)
 
     piix4_acpi_system_hot_add_init(pci_address_space_io(dev),
                                    pci_get_bus(dev), s);
-    qbus_set_hotplug_handler(BUS(pci_get_bus(dev)), OBJECT(s), &error_abort);
+    qbus_set_hotplug_handler(BUS(pci_get_bus(dev)), OBJECT(s));
 
     piix4_pm_add_propeties(s);
 }

hw/char/virtio-serial-bus.c

@@ -1056,7 +1056,7 @@ static void virtio_serial_device_realize(DeviceState *dev, Error **errp)
     /* Spawn a new virtio-serial bus on which the ports will ride as devices */
     qbus_create_inplace(&vser->bus, sizeof(vser->bus), TYPE_VIRTIO_SERIAL_BUS,
                         dev, vdev->bus_name);
-    qbus_set_hotplug_handler(BUS(&vser->bus), OBJECT(vser), errp);
+    qbus_set_hotplug_handler(BUS(&vser->bus), OBJECT(vser));
     vser->bus.vser = vser;
     QTAILQ_INIT(&vser->ports);
 
@@ -1147,7 +1147,7 @@ static void virtio_serial_device_unrealize(DeviceState *dev)
         g_free(vser->post_load);
     }
 
-    qbus_set_hotplug_handler(BUS(&vser->bus), NULL, &error_abort);
+    qbus_set_hotplug_handler(BUS(&vser->bus), NULL);
 
     virtio_cleanup(vdev);
 }

hw/core/bus.c

@@ -23,15 +23,15 @@
 #include "qemu/module.h"
 #include "qapi/error.h"
 
-void qbus_set_hotplug_handler(BusState *bus, Object *handler, Error **errp)
+void qbus_set_hotplug_handler(BusState *bus, Object *handler)
 {
     object_property_set_link(OBJECT(bus), handler,
-                             QDEV_HOTPLUG_HANDLER_PROPERTY, errp);
+                             QDEV_HOTPLUG_HANDLER_PROPERTY, &error_abort);
 }
 
 void qbus_set_bus_hotplug_handler(BusState *bus)
 {
-    qbus_set_hotplug_handler(bus, OBJECT(bus), &error_abort);
+    qbus_set_hotplug_handler(bus, OBJECT(bus));
 }
 
 int qbus_walk_children(BusState *bus,

hw/pci/pcie.c

@@ -574,7 +574,7 @@ void pcie_cap_slot_init(PCIDevice *dev, PCIESlot *s)
     dev->exp.hpev_notified = false;
 
     qbus_set_hotplug_handler(BUS(pci_bridge_get_sec_bus(PCI_BRIDGE(dev))),
-                             OBJECT(dev), NULL);
+                             OBJECT(dev));
 }
 
 void pcie_cap_slot_reset(PCIDevice *dev)

hw/pci/shpc.c

@@ -649,7 +649,7 @@ int shpc_init(PCIDevice *d, PCIBus *sec_bus, MemoryRegion *bar,
     shpc_cap_update_dword(d);
     memory_region_add_subregion(bar, offset, &shpc->mmio);
 
-    qbus_set_hotplug_handler(BUS(sec_bus), OBJECT(d), NULL);
+    qbus_set_hotplug_handler(BUS(sec_bus), OBJECT(d));
 
     d->cap_present |= QEMU_PCI_CAP_SHPC;
     return 0;

hw/ppc/spapr.c

@@ -3033,8 +3033,7 @@ static void spapr_machine_init(MachineState *machine)
     register_savevm_live("spapr/htab", VMSTATE_INSTANCE_ID_ANY, 1,
                          &savevm_htab_handlers, spapr);
 
-    qbus_set_hotplug_handler(sysbus_get_default(), OBJECT(machine),
-                             &error_fatal);
+    qbus_set_hotplug_handler(sysbus_get_default(), OBJECT(machine));
 
     qemu_register_boot_set(spapr_boot_set, spapr);
 

hw/ppc/spapr_pci.c

@@ -1719,7 +1719,7 @@ static void spapr_phb_unrealize(DeviceState *dev)
     address_space_remove_listeners(&sphb->iommu_as);
     address_space_destroy(&sphb->iommu_as);
 
-    qbus_set_hotplug_handler(BUS(phb->bus), NULL, &error_abort);
+    qbus_set_hotplug_handler(BUS(phb->bus), NULL);
     pci_unregister_root_bus(phb->bus);
 
     memory_region_del_subregion(get_system_memory(), &sphb->iowindow);
@@ -1868,7 +1868,7 @@ static void spapr_phb_realize(DeviceState *dev, Error **errp)
         bus->flags |= PCI_BUS_EXTENDED_CONFIG_SPACE;
     }
     phb->bus = bus;
-    qbus_set_hotplug_handler(BUS(phb->bus), OBJECT(sphb), NULL);
+    qbus_set_hotplug_handler(BUS(phb->bus), OBJECT(sphb));
 
     /*
      * Initialize PHB address space.

hw/s390x/ap-bridge.c

@@ -58,7 +58,7 @@ void s390_init_ap(void)
     bus = qbus_create(TYPE_AP_BUS, dev, TYPE_AP_BUS);
 
     /* Enable hotplugging */
-    qbus_set_hotplug_handler(bus, OBJECT(dev), &error_abort);
+    qbus_set_hotplug_handler(bus, OBJECT(dev));
  }
 
 static void ap_bridge_class_init(ObjectClass *oc, void *data)

hw/s390x/css-bridge.c

@@ -111,7 +111,7 @@ VirtualCssBus *virtual_css_bus_init(void)
     cbus = VIRTUAL_CSS_BUS(bus);
 
     /* Enable hotplugging */
-    qbus_set_hotplug_handler(bus, OBJECT(dev), &error_abort);
+    qbus_set_hotplug_handler(bus, OBJECT(dev));
 
     css_register_io_adapters(CSS_IO_ADAPTER_VIRTIO, true, false,
                              0, &error_abort);

hw/s390x/s390-pci-bus.c

@@ -751,19 +751,11 @@ static void s390_pcihost_realize(DeviceState *dev, Error **errp)
     pci_setup_iommu(b, s390_pci_dma_iommu, s);
 
     bus = BUS(b);
-    qbus_set_hotplug_handler(bus, OBJECT(dev), &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
-        return;
-    }
+    qbus_set_hotplug_handler(bus, OBJECT(dev));
     phb->bus = b;
 
     s->bus = S390_PCI_BUS(qbus_create(TYPE_S390_PCI_BUS, dev, NULL));
-    qbus_set_hotplug_handler(BUS(s->bus), OBJECT(dev), &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
-        return;
-    }
+    qbus_set_hotplug_handler(BUS(s->bus), OBJECT(dev));
 
     s->iommu_table = g_hash_table_new_full(g_int64_hash, g_int64_equal,
                                            NULL, g_free);
@@ -921,7 +913,7 @@ static void s390_pcihost_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
         pci_bridge_map_irq(pb, dev->id, s390_pci_map_irq);
         pci_setup_iommu(&pb->sec_bus, s390_pci_dma_iommu, s);
 
-        qbus_set_hotplug_handler(BUS(&pb->sec_bus), OBJECT(s), errp);
+        qbus_set_hotplug_handler(BUS(&pb->sec_bus), OBJECT(s));
 
         if (dev->hotplugged) {
             pci_default_write_config(pdev, PCI_PRIMARY_BUS,

hw/scsi/virtio-scsi.c

@@ -934,7 +934,7 @@ static void virtio_scsi_device_realize(DeviceState *dev, Error **errp)
     scsi_bus_new(&s->bus, sizeof(s->bus), dev,
                  &virtio_scsi_scsi_info, vdev->bus_name);
     /* override default SCSI bus hotplug-handler, with virtio-scsi's one */
-    qbus_set_hotplug_handler(BUS(&s->bus), OBJECT(dev), &error_abort);
+    qbus_set_hotplug_handler(BUS(&s->bus), OBJECT(dev));
 
     virtio_scsi_dataplane_setup(s, errp);
 }
@@ -958,7 +958,7 @@ static void virtio_scsi_device_unrealize(DeviceState *dev)
 {
     VirtIOSCSI *s = VIRTIO_SCSI(dev);
 
-    qbus_set_hotplug_handler(BUS(&s->bus), NULL, &error_abort);
+    qbus_set_hotplug_handler(BUS(&s->bus), NULL);
     virtio_scsi_common_unrealize(dev);
 }
 

hw/scsi/vmw_pvscsi.c

@@ -1147,7 +1147,7 @@ pvscsi_realizefn(PCIDevice *pci_dev, Error **errp)
     scsi_bus_new(&s->bus, sizeof(s->bus), DEVICE(pci_dev),
                  &pvscsi_scsi_info, NULL);
     /* override default SCSI bus hotplug-handler, with pvscsi's one */
-    qbus_set_hotplug_handler(BUS(&s->bus), OBJECT(s), &error_abort);
+    qbus_set_hotplug_handler(BUS(&s->bus), OBJECT(s));
     pvscsi_reset_state(s);
 }
 

hw/usb/dev-smartcard-reader.c

@@ -1320,7 +1320,7 @@ static void ccid_realize(USBDevice *dev, Error **errp)
     usb_desc_init(dev);
     qbus_create_inplace(&s->bus, sizeof(s->bus), TYPE_CCID_BUS, DEVICE(dev),
                         NULL);
-    qbus_set_hotplug_handler(BUS(&s->bus), OBJECT(dev), &error_abort);
+    qbus_set_hotplug_handler(BUS(&s->bus), OBJECT(dev));
     s->intr = usb_ep_get(dev, USB_TOKEN_IN, CCID_INT_IN_EP);
     s->bulk = usb_ep_get(dev, USB_TOKEN_IN, CCID_BULK_IN_EP);
     s->card = NULL;

include/hw/qdev-core.h

@@ -535,8 +535,7 @@ extern bool qdev_hot_removed;
 
 char *qdev_get_dev_path(DeviceState *dev);
 
-void qbus_set_hotplug_handler(BusState *bus, Object *handler, Error **errp);
-
+void qbus_set_hotplug_handler(BusState *bus, Object *handler);
 void qbus_set_bus_hotplug_handler(BusState *bus);
 
 static inline bool qbus_is_hotpluggable(BusState *bus)