diff options
| -rw-r--r-- | hw/dma/i82374.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/hw/dma/i82374.c b/hw/dma/i82374.c index 83c87d92e0..892f655a7e 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)); } |