On 05/30/13 17:05, Laszlo Ersek wrote:
> On 05/30/13 15:27, Michael S. Tsirkin wrote:
>> Use the type-safe FWCfgState structure instead
>> of the unsafe void *.
>>
>> Signed-off-by: Michael S. Tsirkin <m...@redhat.com>
>> ---
>> hw/misc/pvpanic.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/hw/misc/pvpanic.c b/hw/misc/pvpanic.c
>> index 31e1b1d..1483f27 100644
>> --- a/hw/misc/pvpanic.c
>> +++ b/hw/misc/pvpanic.c
>> @@ -90,7 +90,7 @@ static int pvpanic_isa_initfn(ISADevice *dev)
>> {
>> PVPanicState *s = ISA_PVPANIC_DEVICE(dev);
>> static bool port_configured;
>> - void *fw_cfg;
>> + FWCfgState *fw_cfg;
>>
>> memory_region_init_io(&s->io, &pvpanic_ops, s, "pvpanic", 1);
>> isa_register_ioport(dev, &s->io, s->ioport);
>>
>
> Doesn't this break your build? Lower down in the function there's
>
> fw_cfg = object_resolve_path("/machine/fw_cfg", NULL);
>
> and object_resolve_path() returns a pointer-to-Object, not
> pointer-to-FWCfgState.
Paolo explained the guts, but don't we still need a downcast here? (No
idea how to do that nicely in the object model du jour -- maybe
OBJECT_CHECK() or similar?)
Laszlo
