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hw/dma/i82374: Avoid double creation of the 82374 controller

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QEMU fails when used with the following command line:

    ./ppc64-softmmu/qemu-system-ppc64 -S -machine 40p -device i82374
    qemu-system-ppc64: hw/isa/isa-bus.c:110: isa_bus_dma: Assertion `!bus->dma[0] && !bus->dma[1]' failed.

The 40p machine type already creates the device i82374. If specified in the
command line, it will try to create it again, hence generating the error. The
function isa_bus_dma() isn't supposed to be called twice for the same bus.
Check the bus doesn't already have a DMA controller registered before creating
the device.

Fixes: https://bugs.launchpad.net/qemu/+bug/1721224
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20180326153441.32641-2-f4bug@amsat.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Philippe Mathieu-Daudé 2018-03-26 12:34:37 -03:00 committed by Paolo Bonzini
parent 29e560f00e
commit 4968a2c6ed
1 changed files with 8 additions and 1 deletions
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9
hw/dma/i82374.c
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@ -23,6 +23,7 @@
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "hw/isa/isa.h"
#include "hw/dma/i8257.h"
@ -118,13 +119,19 @@ static const MemoryRegionPortio i82374_portio_list[] = {
static void i82374_realize(DeviceState *dev, Error **errp)
{
I82374State *s = I82374(dev);
ISABus *isa_bus = isa_bus_from_device(ISA_DEVICE(dev));
if (isa_get_dma(isa_bus, 0)) {
error_setg(errp, "DMA already initialized on ISA bus");
return;
}
i8257_dma_init(isa_bus, true);
portio_list_init(&s->port_list, OBJECT(s), i82374_portio_list, s,
"i82374");
portio_list_add(&s->port_list, isa_address_space_io(&s->parent_obj),
s->iobase);
i8257_dma_init(isa_bus_from_device(ISA_DEVICE(dev)), true);
memset(s->commands, 0, sizeof(s->commands));
}