From: Philippe Mathieu-Daudé <f4...@amsat.org>
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 <f4...@amsat.org>
Message-Id: <20180326153441.32641-2-f4...@amsat.org>
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
hw/dma/i82374.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/hw/dma/i82374.c b/hw/dma/i82374.c
index 83c87d9..892f655 100644
--- a/hw/dma/i82374.c
+++ b/hw/dma/i82374.c
@@ -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));
}
--
1.8.3.1
