[PATCH 08/15] spapr: Add a return value to spapr_drc_attach()

[Greg Kurz <groug@kaod.org>]

As recommended in "qapi/error.h", return true on success and false on
failure. This allows to reduce error propagation overhead in the callers.

Signed-off-by: Greg Kurz <groug@kaod.org>
---
 include/hw/ppc/spapr_drc.h |  2 +-
 hw/ppc/spapr.c             | 15 +++------------
 hw/ppc/spapr_drc.c         |  5 +++--
 hw/ppc/spapr_nvdimm.c      |  5 +----
 hw/ppc/spapr_pci.c         |  5 +----
 5 files changed, 9 insertions(+), 23 deletions(-)

diff --git a/include/hw/ppc/spapr_drc.h b/include/hw/ppc/spapr_drc.h
index f2708607696e..165b281496bb 100644
--- a/include/hw/ppc/spapr_drc.h
+++ b/include/hw/ppc/spapr_drc.h
@@ -235,7 +235,7 @@ SpaprDrc *spapr_drc_by_index(uint32_t index);
 SpaprDrc *spapr_drc_by_id(const char *type, uint32_t id);
 int spapr_dt_drc(void *fdt, int offset, Object *owner, uint32_t drc_type_mask);
 
-void spapr_drc_attach(SpaprDrc *drc, DeviceState *d, Error **errp);
+bool spapr_drc_attach(SpaprDrc *drc, DeviceState *d, Error **errp);
 void spapr_drc_detach(SpaprDrc *drc);
 
 /* Returns true if a hot plug/unplug request is pending */
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index c0a3f5f26d97..8b2b4e6272e6 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -3374,22 +3374,19 @@ static void spapr_add_lmbs(DeviceState *dev, uint64_t addr_start, uint64_t size,
     int i;
     uint64_t addr = addr_start;
     bool hotplugged = spapr_drc_hotplugged(dev);
-    Error *local_err = NULL;
 
     for (i = 0; i < nr_lmbs; i++) {
         drc = spapr_drc_by_id(TYPE_SPAPR_DRC_LMB,
                               addr / SPAPR_MEMORY_BLOCK_SIZE);
         g_assert(drc);
 
-        spapr_drc_attach(drc, dev, &local_err);
-        if (local_err) {
+        if (!spapr_drc_attach(drc, dev, errp)) {
             while (addr > addr_start) {
                 addr -= SPAPR_MEMORY_BLOCK_SIZE;
                 drc = spapr_drc_by_id(TYPE_SPAPR_DRC_LMB,
                                       addr / SPAPR_MEMORY_BLOCK_SIZE);
                 spapr_drc_detach(drc);
             }
-            error_propagate(errp, local_err);
             return;
         }
         if (!hotplugged) {
@@ -3770,7 +3767,6 @@ static void spapr_core_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
     CPUCore *cc = CPU_CORE(dev);
     CPUState *cs;
     SpaprDrc *drc;
-    Error *local_err = NULL;
     CPUArchId *core_slot;
     int index;
     bool hotplugged = spapr_drc_hotplugged(dev);
@@ -3788,9 +3784,7 @@ static void spapr_core_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
     g_assert(drc || !mc->has_hotpluggable_cpus);
 
     if (drc) {
-        spapr_drc_attach(drc, dev, &local_err);
-        if (local_err) {
-            error_propagate(errp, local_err);
+        if (!spapr_drc_attach(drc, dev, errp)) {
             return;
         }
 
@@ -3942,7 +3936,6 @@ static void spapr_phb_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
     SpaprPhbState *sphb = SPAPR_PCI_HOST_BRIDGE(dev);
     SpaprDrc *drc;
     bool hotplugged = spapr_drc_hotplugged(dev);
-    Error *local_err = NULL;
 
     if (!smc->dr_phb_enabled) {
         return;
@@ -3952,9 +3945,7 @@ static void spapr_phb_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
     /* hotplug hooks should check it's enabled before getting this far */
     assert(drc);
 
-    spapr_drc_attach(drc, dev, &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
+    if (!spapr_drc_attach(drc, dev, errp)) {
         return;
     }
 
diff --git a/hw/ppc/spapr_drc.c b/hw/ppc/spapr_drc.c
index fe998d8108b1..04a6bf134ee8 100644
--- a/hw/ppc/spapr_drc.c
+++ b/hw/ppc/spapr_drc.c
@@ -371,13 +371,13 @@ static void prop_get_fdt(Object *obj, Visitor *v, const char *name,
     } while (fdt_depth != 0);
 }
 
-void spapr_drc_attach(SpaprDrc *drc, DeviceState *d, Error **errp)
+bool spapr_drc_attach(SpaprDrc *drc, DeviceState *d, Error **errp)
 {
     trace_spapr_drc_attach(spapr_drc_index(drc));
 
     if (drc->dev) {
         error_setg(errp, "an attached device is still awaiting release");
-        return;
+        return false;
     }
     g_assert((drc->state == SPAPR_DRC_STATE_LOGICAL_UNUSABLE)
              || (drc->state == SPAPR_DRC_STATE_PHYSICAL_POWERON));
@@ -388,6 +388,7 @@ void spapr_drc_attach(SpaprDrc *drc, DeviceState *d, Error **errp)
                              object_get_typename(OBJECT(drc->dev)),
                              (Object **)(&drc->dev),
                              NULL, 0);
+    return true;
 }
 
 static void spapr_drc_release(SpaprDrc *drc)
diff --git a/hw/ppc/spapr_nvdimm.c b/hw/ppc/spapr_nvdimm.c
index 63872054f375..c06f903e5bff 100644
--- a/hw/ppc/spapr_nvdimm.c
+++ b/hw/ppc/spapr_nvdimm.c
@@ -91,14 +91,11 @@ void spapr_add_nvdimm(DeviceState *dev, uint64_t slot, Error **errp)
 {
     SpaprDrc *drc;
     bool hotplugged = spapr_drc_hotplugged(dev);
-    Error *local_err = NULL;
 
     drc = spapr_drc_by_id(TYPE_SPAPR_DRC_PMEM, slot);
     g_assert(drc);
 
-    spapr_drc_attach(drc, dev, &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
+    if (!spapr_drc_attach(drc, dev, errp)) {
         return;
     }
 
diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
index 4d97ff6c70f2..30d054a4d04c 100644
--- a/hw/ppc/spapr_pci.c
+++ b/hw/ppc/spapr_pci.c
@@ -1539,7 +1539,6 @@ static void spapr_pci_plug(HotplugHandler *plug_handler,
     PCIDevice *pdev = PCI_DEVICE(plugged_dev);
     PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(plugged_dev);
     SpaprDrc *drc = drc_from_dev(phb, pdev);
-    Error *local_err = NULL;
     PCIBus *bus = PCI_BUS(qdev_get_parent_bus(DEVICE(pdev)));
     uint32_t slotnr = PCI_SLOT(pdev->devfn);
 
@@ -1578,9 +1577,7 @@ static void spapr_pci_plug(HotplugHandler *plug_handler,
         return;
     }
 
-    spapr_drc_attach(drc, DEVICE(pdev), &local_err);
-    if (local_err) {
-        error_propagate(errp, local_err);
+    if (!spapr_drc_attach(drc, DEVICE(pdev), errp)) {
         return;
     }
 
-- 
2.26.2