qom: Drop parameter @errp of object_property_add() & friends

The only way object_property_add() can fail is when a property with
the same name already exists.  Since our property names are all
hardcoded, failure is a programming error, and the appropriate way to
handle it is passing &error_abort.

Same for its variants, except for object_property_add_child(), which
additionally fails when the child already has a parent.  Parentage is
also under program control, so this is a programming error, too.

We have a bit over 500 callers.  Almost half of them pass
&error_abort, slightly fewer ignore errors, one test case handles
errors, and the remaining few callers pass them to their own callers.

The previous few commits demonstrated once again that ignoring
programming errors is a bad idea.

Of the few ones that pass on errors, several violate the Error API.
The Error ** argument must be NULL, &error_abort, &error_fatal, or a
pointer to a variable containing NULL.  Passing an argument of the
latter kind twice without clearing it in between is wrong: if the
first call sets an error, it no longer points to NULL for the second
call.  ich9_pm_add_properties(), sparc32_ledma_realize(),
sparc32_dma_realize(), xilinx_axidma_realize(), xilinx_enet_realize()
are wrong that way.

When the one appropriate choice of argument is &error_abort, letting
users pick the argument is a bad idea.

Drop parameter @errp and assert the preconditions instead.

There's one exception to "duplicate property name is a programming
error": the way object_property_add() implements the magic (and
undocumented) "automatic arrayification".  Don't drop @errp there.
Instead, rename object_property_add() to object_property_try_add(),
and add the obvious wrapper object_property_add().

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20200505152926.18877-15-armbru@redhat.com>
[Two semantic rebase conflicts resolved]

7 files changed, 24 insertions, 26 deletions

diff --git a/hw/pci-host/grackle.c b/hw/pci-host/grackle.c
index 24ccdf6ceb..4b3af0c704 100644
--- a/hw/pci-host/grackle.c
+++ b/hw/pci-host/grackle.c
@@ -109,7 +109,7 @@ static void grackle_init(Object *obj)
     object_property_add_link(obj, "pic", TYPE_HEATHROW,
                              (Object **) &s->pic,
                              qdev_prop_allow_set_link_before_realize,
-                             0, NULL);
+                             0);
 
     sysbus_init_mmio(sbd, &phb->conf_mem);
     sysbus_init_mmio(sbd, &phb->data_mem);
diff --git a/hw/pci-host/i440fx.c b/hw/pci-host/i440fx.c
index d980c97049..0adbd77553 100644
--- a/hw/pci-host/i440fx.c
+++ b/hw/pci-host/i440fx.c
@@ -212,19 +212,19 @@ static void i440fx_pcihost_initfn(Object *obj)
 
     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_START, "uint32",
                         i440fx_pcihost_get_pci_hole_start,
-                        NULL, NULL, NULL, NULL);
+                        NULL, NULL, NULL);
 
     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_END, "uint32",
                         i440fx_pcihost_get_pci_hole_end,
-                        NULL, NULL, NULL, NULL);
+                        NULL, NULL, NULL);
 
     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE64_START, "uint64",
                         i440fx_pcihost_get_pci_hole64_start,
-                        NULL, NULL, NULL, NULL);
+                        NULL, NULL, NULL);
 
     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE64_END, "uint64",
                         i440fx_pcihost_get_pci_hole64_end,
-                        NULL, NULL, NULL, NULL);
+                        NULL, NULL, NULL);
 }
 
 static void i440fx_pcihost_realize(DeviceState *dev, Error **errp)
@@ -275,7 +275,7 @@ PCIBus *i440fx_init(const char *host_type, const char *pci_type,
     b = pci_root_bus_new(dev, NULL, pci_address_space,
                          address_space_io, 0, TYPE_PCI_BUS);
     s->bus = b;
-    object_property_add_child(qdev_get_machine(), "i440fx", OBJECT(dev), NULL);
+    object_property_add_child(qdev_get_machine(), "i440fx", OBJECT(dev));
     qdev_init_nofail(dev);
 
     d = pci_create_simple(b, 0, pci_type);
@@ -308,7 +308,7 @@ PCIBus *i440fx_init(const char *host_type, const char *pci_type,
     memory_region_set_enabled(&f->low_smram, true);
     memory_region_add_subregion(&f->smram, 0xa0000, &f->low_smram);
     object_property_add_const_link(qdev_get_machine(), "smram",
-                                   OBJECT(&f->smram), &error_abort);
+                                   OBJECT(&f->smram));
 
     init_pam(dev, f->ram_memory, f->system_memory, f->pci_address_space,
              &f->pam_regions[0], PAM_BIOS_BASE, PAM_BIOS_SIZE);
diff --git a/hw/pci-host/pnv_phb3_msi.c b/hw/pci-host/pnv_phb3_msi.c
index d645468f4a..099d2092a2 100644
--- a/hw/pci-host/pnv_phb3_msi.c
+++ b/hw/pci-host/pnv_phb3_msi.c
@@ -282,8 +282,7 @@ static void phb3_msi_instance_init(Object *obj)
     object_property_add_link(obj, "phb", TYPE_PNV_PHB3,
                              (Object **)&msi->phb,
                              object_property_allow_set_link,
-                             OBJ_PROP_LINK_STRONG,
-                             &error_abort);
+                             OBJ_PROP_LINK_STRONG);
 
     /* Will be overriden later */
     ics->offset = 0;
diff --git a/hw/pci-host/pnv_phb3_pbcq.c b/hw/pci-host/pnv_phb3_pbcq.c
index 7b9a121246..a0526aa1ec 100644
--- a/hw/pci-host/pnv_phb3_pbcq.c
+++ b/hw/pci-host/pnv_phb3_pbcq.c
@@ -324,8 +324,7 @@ static void phb3_pbcq_instance_init(Object *obj)
     object_property_add_link(obj, "phb", TYPE_PNV_PHB3,
                              (Object **)&pbcq->phb,
                              object_property_allow_set_link,
-                             OBJ_PROP_LINK_STRONG,
-                             &error_abort);
+                             OBJ_PROP_LINK_STRONG);
 }
 
 static void pnv_pbcq_class_init(ObjectClass *klass, void *data)
diff --git a/hw/pci-host/q35.c b/hw/pci-host/q35.c
index 2bbc90b28f..352aeecfa7 100644
--- a/hw/pci-host/q35.c
+++ b/hw/pci-host/q35.c
@@ -222,38 +222,38 @@ static void q35_host_initfn(Object *obj)
                          Q35_PCI_HOST_HOLE64_SIZE_DEFAULT);
     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_START, "uint32",
                         q35_host_get_pci_hole_start,
-                        NULL, NULL, NULL, NULL);
+                        NULL, NULL, NULL);
 
     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE_END, "uint32",
                         q35_host_get_pci_hole_end,
-                        NULL, NULL, NULL, NULL);
+                        NULL, NULL, NULL);
 
     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE64_START, "uint64",
                         q35_host_get_pci_hole64_start,
-                        NULL, NULL, NULL, NULL);
+                        NULL, NULL, NULL);
 
     object_property_add(obj, PCI_HOST_PROP_PCI_HOLE64_END, "uint64",
                         q35_host_get_pci_hole64_end,
-                        NULL, NULL, NULL, NULL);
+                        NULL, NULL, NULL);
 
     object_property_add_uint64_ptr(obj, PCIE_HOST_MCFG_SIZE,
-                                   &pehb->size, OBJ_PROP_FLAG_READ, NULL);
+                                   &pehb->size, OBJ_PROP_FLAG_READ);
 
     object_property_add_link(obj, MCH_HOST_PROP_RAM_MEM, TYPE_MEMORY_REGION,
                              (Object **) &s->mch.ram_memory,
-                             qdev_prop_allow_set_link_before_realize, 0, NULL);
+                             qdev_prop_allow_set_link_before_realize, 0);
 
     object_property_add_link(obj, MCH_HOST_PROP_PCI_MEM, TYPE_MEMORY_REGION,
                              (Object **) &s->mch.pci_address_space,
-                             qdev_prop_allow_set_link_before_realize, 0, NULL);
+                             qdev_prop_allow_set_link_before_realize, 0);
 
     object_property_add_link(obj, MCH_HOST_PROP_SYSTEM_MEM, TYPE_MEMORY_REGION,
                              (Object **) &s->mch.system_memory,
-                             qdev_prop_allow_set_link_before_realize, 0, NULL);
+                             qdev_prop_allow_set_link_before_realize, 0);
 
     object_property_add_link(obj, MCH_HOST_PROP_IO_MEM, TYPE_MEMORY_REGION,
                              (Object **) &s->mch.address_space_io,
-                             qdev_prop_allow_set_link_before_realize, 0, NULL);
+                             qdev_prop_allow_set_link_before_realize, 0);
 }
 
 static const TypeInfo q35_host_info = {
@@ -638,7 +638,7 @@ static void mch_realize(PCIDevice *d, Error **errp)
                                 &mch->smbase_window);
 
     object_property_add_const_link(qdev_get_machine(), "smram",
-                                   OBJECT(&mch->smram), &error_abort);
+                                   OBJECT(&mch->smram));
 
     init_pam(DEVICE(mch), mch->ram_memory, mch->system_memory,
              mch->pci_address_space, &mch->pam_regions[0],
diff --git a/hw/pci-host/sabre.c b/hw/pci-host/sabre.c
index 2b8503b709..475bcb01d7 100644
--- a/hw/pci-host/sabre.c
+++ b/hw/pci-host/sabre.c
@@ -442,7 +442,7 @@ static void sabre_init(Object *obj)
     object_property_add_link(obj, "iommu", TYPE_SUN4U_IOMMU,
                              (Object **) &s->iommu,
                              qdev_prop_allow_set_link_before_realize,
-                             0, NULL);
+                             0);
 
     /* sabre_config */
     memory_region_init_io(&s->sabre_config, OBJECT(s), &sabre_config_ops, s,
diff --git a/hw/pci-host/uninorth.c b/hw/pci-host/uninorth.c
index cf70b76fe2..1ed1072eeb 100644
--- a/hw/pci-host/uninorth.c
+++ b/hw/pci-host/uninorth.c
@@ -175,7 +175,7 @@ static void pci_unin_main_init(Object *obj)
     object_property_add_link(obj, "pic", TYPE_OPENPIC,
                              (Object **) &s->pic,
                              qdev_prop_allow_set_link_before_realize,
-                             0, NULL);
+                             0);
 
     sysbus_init_mmio(sbd, &h->conf_mem);
     sysbus_init_mmio(sbd, &h->data_mem);
@@ -223,7 +223,7 @@ static void pci_u3_agp_init(Object *obj)
     object_property_add_link(obj, "pic", TYPE_OPENPIC,
                              (Object **) &s->pic,
                              qdev_prop_allow_set_link_before_realize,
-                             0, NULL);
+                             0);
 
     sysbus_init_mmio(sbd, &h->conf_mem);
     sysbus_init_mmio(sbd, &h->data_mem);
@@ -262,7 +262,7 @@ static void pci_unin_agp_init(Object *obj)
     object_property_add_link(obj, "pic", TYPE_OPENPIC,
                              (Object **) &s->pic,
                              qdev_prop_allow_set_link_before_realize,
-                             0, NULL);
+                             0);
 
     sysbus_init_mmio(sbd, &h->conf_mem);
     sysbus_init_mmio(sbd, &h->data_mem);
@@ -299,7 +299,7 @@ static void pci_unin_internal_init(Object *obj)
     object_property_add_link(obj, "pic", TYPE_OPENPIC,
                              (Object **) &s->pic,
                              qdev_prop_allow_set_link_before_realize,
-                             0, NULL);
+                             0);
 
     sysbus_init_mmio(sbd, &h->conf_mem);
     sysbus_init_mmio(sbd, &h->data_mem);