Re: [PATCH v3] hw/core/qdev: Increase qdev_realize() kindness

[Markus Armbruster <armbru@redhat.com>]

Philippe Mathieu-Daudé <f4bug@amsat.org> writes:

> On 7/7/20 11:47 AM, Paolo Bonzini wrote:
>> On 07/07/20 05:33, Philippe Mathieu-Daudé wrote:
>>> Since commit 510ef98dca5, qdev_realize() aborts if bus-less device
>>> is realized on a bus. While commits 514db7710b..007d1dbf72 took
>>> care of converting all mainstream uses, QEMU forks weren't. These
>>> forks are usually maintained by hobbyist with interest in following
>>> mainstream development, but with limited time, so usually rebase
>>> from time to time. To avoid them to spend time on debugging and
>>> reading git-log history, display a kind hint about what is wrong.
>>>
>>> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
>>> ---
>>> Since v2:
>>> - scratch __func__ (armbru)
>>> - reword to justify this is not an impossible case (armbru)
>>> ---
>>>  hw/core/qdev.c | 7 +++++--
>>>  1 file changed, 5 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/hw/core/qdev.c b/hw/core/qdev.c
>>> index 2131c7f951..a16f1270f1 100644
>>> --- a/hw/core/qdev.c
>>> +++ b/hw/core/qdev.c
>>> @@ -392,8 +392,11 @@ bool qdev_realize(DeviceState *dev, BusState *bus, Error **errp)
>>>  
>>>      if (bus) {
>>>          qdev_set_parent_bus(dev, bus);
>>> -    } else {
>>> -        assert(!DEVICE_GET_CLASS(dev)->bus_type);
>>> +    } else if (DEVICE_GET_CLASS(dev)->bus_type) {
>>> +        error_setg(errp, "Unexpected bus '%s' for bus-less device '%s'",
>>> +                   DEVICE_GET_CLASS(dev)->bus_type,
>>> +                   object_get_typename(OBJECT(dev)));
>>> +        return false;
>>>      }
>>>  
>>>      object_property_set_bool(OBJECT(dev), true, "realized", &err);
>>>
>> 
>> Queued, thanks.
>
> Thanks! I haven't see that and sent a v4 with example included &
> typo fixed, if possible can you take it instead?
> https://patchew.org/QEMU/20200727175112.6820-1-f4bug@amsat.org/

Please also consider my objection in reply to v4.