There can be only one TPM proxy at a time. This is currently checked at plug time. But this can be detected at pre-plug in order to error out earlier.
This allows to get rid of error handling in the plug handler. Signed-off-by: Greg Kurz <gr...@kaod.org> --- hw/ppc/spapr.c | 23 ++++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-) diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index bded059d59c8..5e32d1d396b4 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -3957,17 +3957,28 @@ static void spapr_phb_unplug_request(HotplugHandler *hotplug_dev, } } -static void spapr_tpm_proxy_plug(HotplugHandler *hotplug_dev, DeviceState *dev, - Error **errp) +static +bool spapr_tpm_proxy_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev, + Error **errp) { SpaprMachineState *spapr = SPAPR_MACHINE(OBJECT(hotplug_dev)); - SpaprTpmProxy *tpm_proxy = SPAPR_TPM_PROXY(dev); if (spapr->tpm_proxy != NULL) { error_setg(errp, "Only one TPM proxy can be specified for this machine"); - return; + return false; } + return true; +} + +static void spapr_tpm_proxy_plug(HotplugHandler *hotplug_dev, DeviceState *dev) +{ + SpaprMachineState *spapr = SPAPR_MACHINE(OBJECT(hotplug_dev)); + SpaprTpmProxy *tpm_proxy = SPAPR_TPM_PROXY(dev); + + /* Already checked in spapr_tpm_proxy_pre_plug() */ + g_assert(spapr->tpm_proxy == NULL); + spapr->tpm_proxy = tpm_proxy; } @@ -3990,7 +4001,7 @@ static void spapr_machine_device_plug(HotplugHandler *hotplug_dev, } else if (object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_PCI_HOST_BRIDGE)) { spapr_phb_plug(hotplug_dev, dev); } else if (object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_TPM_PROXY)) { - spapr_tpm_proxy_plug(hotplug_dev, dev, errp); + spapr_tpm_proxy_plug(hotplug_dev, dev); } } @@ -4053,6 +4064,8 @@ static void spapr_machine_device_pre_plug(HotplugHandler *hotplug_dev, spapr_core_pre_plug(hotplug_dev, dev, errp); } else if (object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_PCI_HOST_BRIDGE)) { spapr_phb_pre_plug(hotplug_dev, dev, errp); + } else if (object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_TPM_PROXY)) { + spapr_tpm_proxy_pre_plug(hotplug_dev, dev, errp); } } -- 2.26.2