qdev: Make DeviceState.id independent of QemuOpts

DeviceState.id is a pointer to a string that is stored in the QemuOpts
object DeviceState.opts and freed together with it. We want to create
devices without going through QemuOpts in the future, so make this a
separately allocated string.

Signed-off-by: Kevin Wolf <[email protected]>
Reviewed-by: Vladimir Sementsov-Ogievskiy <[email protected]>
Message-Id: <[email protected]>
Reviewed-by: Damien Hedde <[email protected]>
Reviewed-by: Michael S. Tsirkin <[email protected]>
Tested-by: Peter Krempa <[email protected]>
Signed-off-by: Kevin Wolf <[email protected]>

Author: kevmw

hw/arm/virt.c

@@ -1459,7 +1459,7 @@ static void create_platform_bus(VirtMachineState *vms)
     MemoryRegion *sysmem = get_system_memory();
 
     dev = qdev_new(TYPE_PLATFORM_BUS_DEVICE);
-    dev->id = TYPE_PLATFORM_BUS_DEVICE;
+    dev->id = g_strdup(TYPE_PLATFORM_BUS_DEVICE);
     qdev_prop_set_uint32(dev, "num_irqs", PLATFORM_BUS_NUM_IRQS);
     qdev_prop_set_uint32(dev, "mmio_size", vms->memmap[VIRT_PLATFORM_BUS].size);
     sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);

hw/core/qdev.c

@@ -956,6 +956,7 @@ static void device_finalize(Object *obj)
     }
 
     qemu_opts_del(dev->opts);
+    g_free(dev->id);
 }
 
 static void device_class_base_init(ObjectClass *class, void *data)

hw/pci-bridge/pci_expander_bridge.c

@@ -245,7 +245,7 @@ static void pxb_dev_realize_common(PCIDevice *dev, bool pcie, Error **errp)
     } else {
         bus = pci_root_bus_new(ds, "pxb-internal", NULL, NULL, 0, TYPE_PXB_BUS);
         bds = qdev_new("pci-bridge");
-        bds->id = dev_name;
+        bds->id = g_strdup(dev_name);
         qdev_prop_set_uint8(bds, PCI_BRIDGE_DEV_PROP_CHASSIS_NR, pxb->bus_nr);
         qdev_prop_set_bit(bds, PCI_BRIDGE_DEV_PROP_SHPC, false);
     }

hw/ppc/e500.c

@@ -1006,7 +1006,7 @@ void ppce500_init(MachineState *machine)
     /* Platform Bus Device */
     if (pmc->has_platform_bus) {
         dev = qdev_new(TYPE_PLATFORM_BUS_DEVICE);
-        dev->id = TYPE_PLATFORM_BUS_DEVICE;
+        dev->id = g_strdup(TYPE_PLATFORM_BUS_DEVICE);
         qdev_prop_set_uint32(dev, "num_irqs", pmc->platform_bus_num_irqs);
         qdev_prop_set_uint32(dev, "mmio_size", pmc->platform_bus_size);
         sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);

include/hw/qdev-core.h

@@ -176,7 +176,7 @@ struct DeviceState {
     Object parent_obj;
     /*< public >*/
 
-    const char *id;
+    char *id;
     char *canonical_path;
     bool realized;
     bool pending_deleted_event;

include/monitor/qdev.h

@@ -9,6 +9,6 @@ void qmp_device_add(QDict *qdict, QObject **ret_data, Error **errp);
 
 int qdev_device_help(QemuOpts *opts);
 DeviceState *qdev_device_add(QemuOpts *opts, Error **errp);
-void qdev_set_id(DeviceState *dev, const char *id);
+void qdev_set_id(DeviceState *dev, char *id);
 
 #endif

softmmu/qdev-monitor.c

@@ -592,7 +592,8 @@ static BusState *qbus_find(const char *path, Error **errp)
     return bus;
 }
 
-void qdev_set_id(DeviceState *dev, const char *id)
+/* Takes ownership of @id, will be freed when deleting the device */
+void qdev_set_id(DeviceState *dev, char *id)
 {
     if (id) {
         dev->id = id;
@@ -690,7 +691,7 @@ DeviceState *qdev_device_add(QemuOpts *opts, Error **errp)
         }
     }
 
-    qdev_set_id(dev, qemu_opts_id(opts));
+    qdev_set_id(dev, g_strdup(qemu_opts_id(opts)));
 
     /* set properties */
     if (qemu_opt_foreach(opts, set_property, dev, errp)) {