monitor: Tidy up find_device_state()
Commit 6287d827d4 "monitor: allow device_del to accept QOM paths"
extended find_device_state() to accept QOM paths in addition to qdev
IDs. This added a checked conversion to TYPE_DEVICE at the end, which
duplicates the check done for the qdev ID case earlier, except it sets
a *different* error: GenericError "ID is not a hotpluggable device"
when passed a QOM path, and DeviceNotFound "Device 'ID' not found"
when passed a qdev ID. Fortunately, the latter won't happen as long
as we add only devices to /machine/peripheral/.
Earlier, commit b6cc36abb2 "qdev: device_del: Search for to be
unplugged device in 'peripheral' container" rewrote the lookup by qdev
ID to use QOM instead of qdev_find_recursive(), so it can handle
buss-less devices. It does so by constructing an absolute QOM path.
Works, but object_resolve_path_component() is easier. Switching to it
also gets rid of the unclean duplication described above.
While there, avoid converting to TYPE_DEVICE twice, first to check
whether it's possible, and then for real.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Damien Hedde <damien.hedde@greensocs.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20210916111707.84999-1-armbru@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/softmmu/qdev-monitor.c b/softmmu/qdev-monitor.c
index 0705f00..3df99ce 100644
--- a/softmmu/qdev-monitor.c
+++ b/softmmu/qdev-monitor.c
@@ -836,16 +836,12 @@
static DeviceState *find_device_state(const char *id, Error **errp)
{
Object *obj;
+ DeviceState *dev;
if (id[0] == '/') {
obj = object_resolve_path(id, NULL);
} else {
- char *root_path = object_get_canonical_path(qdev_get_peripheral());
- char *path = g_strdup_printf("%s/%s", root_path, id);
-
- g_free(root_path);
- obj = object_resolve_path_type(path, TYPE_DEVICE, NULL);
- g_free(path);
+ obj = object_resolve_path_component(qdev_get_peripheral(), id);
}
if (!obj) {
@@ -854,12 +850,13 @@
return NULL;
}
- if (!object_dynamic_cast(obj, TYPE_DEVICE)) {
+ dev = (DeviceState *)object_dynamic_cast(obj, TYPE_DEVICE);
+ if (!dev) {
error_setg(errp, "%s is not a hotpluggable device", id);
return NULL;
}
- return DEVICE(obj);
+ return dev;
}
void qdev_unplug(DeviceState *dev, Error **errp)
