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monitor: Tidy up find_device_state()

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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>
This commit is contained in:
Markus Armbruster 2021-09-16 13:17:07 +02:00 committed by Paolo Bonzini
parent b71803a746
commit 6952026120
1 changed files with 5 additions and 8 deletions
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13
softmmu/qdev-monitor.c
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@ -836,16 +836,12 @@ void qmp_device_add(QDict *qdict, QObject **ret_data, Error **errp)
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 @@ static DeviceState *find_device_state(const char *id, Error **errp)
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)