[PATCH 14/15] spapr: Simplify error handling in spapr_memory_plug()

[Greg Kurz <groug@kaod.org>]

As recommended in "qapi/error.h", add a bool return value to
spapr_add_lmbs() and spapr_add_nvdimm(), and use them instead
of local_err in spapr_memory_plug().

Since object_property_get_uint() only returns 0 on failure, use
that as well.

Also call ERRP_GUARD() to be able to check the status of void
function pc_dimm_plug() with *errp.

This allows to get rid of the error propagation overhead.

Signed-off-by: Greg Kurz <groug@kaod.org>
---
 include/hw/ppc/spapr_nvdimm.h |  2 +-
 hw/ppc/spapr.c                | 35 +++++++++++++----------------------
 hw/ppc/spapr_nvdimm.c         |  5 +++--
 3 files changed, 17 insertions(+), 25 deletions(-)

diff --git a/include/hw/ppc/spapr_nvdimm.h b/include/hw/ppc/spapr_nvdimm.h
index b834d82f5545..dc30edece997 100644
--- a/include/hw/ppc/spapr_nvdimm.h
+++ b/include/hw/ppc/spapr_nvdimm.h
@@ -30,7 +30,7 @@ int spapr_pmem_dt_populate(SpaprDrc *drc, SpaprMachineState *spapr,
 void spapr_dt_persistent_memory(SpaprMachineState *spapr, void *fdt);
 bool spapr_nvdimm_validate(HotplugHandler *hotplug_dev, NVDIMMDevice *nvdimm,
                            uint64_t size, Error **errp);
-void spapr_add_nvdimm(DeviceState *dev, uint64_t slot, Error **errp);
+bool spapr_add_nvdimm(DeviceState *dev, uint64_t slot, Error **errp);
 void spapr_create_nvdimm_dr_connectors(SpaprMachineState *spapr);
 
 #endif
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index e813c7cfb949..d6b4de6a1c53 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -3366,7 +3366,7 @@ int spapr_lmb_dt_populate(SpaprDrc *drc, SpaprMachineState *spapr,
     return 0;
 }
 
-static void spapr_add_lmbs(DeviceState *dev, uint64_t addr_start, uint64_t size,
+static bool spapr_add_lmbs(DeviceState *dev, uint64_t addr_start, uint64_t size,
                            bool dedicated_hp_event_source, Error **errp)
 {
     SpaprDrc *drc;
@@ -3387,7 +3387,7 @@ static void spapr_add_lmbs(DeviceState *dev, uint64_t addr_start, uint64_t size,
                                       addr / SPAPR_MEMORY_BLOCK_SIZE);
                 spapr_drc_detach(drc);
             }
-            return;
+            return false;
         }
         if (!hotplugged) {
             spapr_drc_reset(drc);
@@ -3409,12 +3409,13 @@ static void spapr_add_lmbs(DeviceState *dev, uint64_t addr_start, uint64_t size,
                                            nr_lmbs);
         }
     }
+    return true;
 }
 
 static void spapr_memory_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
                               Error **errp)
 {
-    Error *local_err = NULL;
+    ERRP_GUARD();
     SpaprMachineState *ms = SPAPR_MACHINE(hotplug_dev);
     PCDIMMDevice *dimm = PC_DIMM(dev);
     uint64_t size, addr, slot;
@@ -3422,39 +3423,29 @@ static void spapr_memory_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
 
     size = memory_device_get_region_size(MEMORY_DEVICE(dev), &error_abort);
 
-    pc_dimm_plug(dimm, MACHINE(ms), &local_err);
-    if (local_err) {
-        goto out;
+    pc_dimm_plug(dimm, MACHINE(ms), errp);
+    if (*errp) {
+        return;
     }
 
     if (!is_nvdimm) {
-        addr = object_property_get_uint(OBJECT(dimm),
-                                        PC_DIMM_ADDR_PROP, &local_err);
-        if (local_err) {
+        addr = object_property_get_uint(OBJECT(dimm), PC_DIMM_ADDR_PROP, errp);
+        if (!addr ||
+            !spapr_add_lmbs(dev, addr, size,
+                            spapr_ovec_test(ms->ov5_cas, OV5_HP_EVT), errp)) {
             goto out_unplug;
         }
-        spapr_add_lmbs(dev, addr, size,
-                       spapr_ovec_test(ms->ov5_cas, OV5_HP_EVT),
-                       &local_err);
     } else {
-        slot = object_property_get_uint(OBJECT(dimm),
-                                        PC_DIMM_SLOT_PROP, &local_err);
-        if (local_err) {
+        slot = object_property_get_uint(OBJECT(dimm), PC_DIMM_SLOT_PROP, errp);
+        if (!slot || !spapr_add_nvdimm(dev, slot, errp)) {
             goto out_unplug;
         }
-        spapr_add_nvdimm(dev, slot, &local_err);
-    }
-
-    if (local_err) {
-        goto out_unplug;
     }
 
     return;
 
 out_unplug:
     pc_dimm_unplug(dimm, MACHINE(ms));
-out:
-    error_propagate(errp, local_err);
 }
 
 static void spapr_memory_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
diff --git a/hw/ppc/spapr_nvdimm.c b/hw/ppc/spapr_nvdimm.c
index b3a489e9fe18..361ac8c28e33 100644
--- a/hw/ppc/spapr_nvdimm.c
+++ b/hw/ppc/spapr_nvdimm.c
@@ -89,7 +89,7 @@ bool spapr_nvdimm_validate(HotplugHandler *hotplug_dev, NVDIMMDevice *nvdimm,
 }
 
 
-void spapr_add_nvdimm(DeviceState *dev, uint64_t slot, Error **errp)
+bool spapr_add_nvdimm(DeviceState *dev, uint64_t slot, Error **errp)
 {
     SpaprDrc *drc;
     bool hotplugged = spapr_drc_hotplugged(dev);
@@ -98,12 +98,13 @@ void spapr_add_nvdimm(DeviceState *dev, uint64_t slot, Error **errp)
     g_assert(drc);
 
     if (!spapr_drc_attach(drc, dev, errp)) {
-        return;
+        return false;
     }
 
     if (hotplugged) {
         spapr_hotplug_req_add_by_index(drc);
     }
+    return true;
 }
 
 void spapr_create_nvdimm_dr_connectors(SpaprMachineState *spapr)
-- 
2.26.2