Mechanical change using the following coccinelle script:

  @@
  identifier dev;
  identifier sbd;
  expression qom_type;
  expression addr;
  @@
  -    dev = qdev_new(qom_type);
  -    sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
  -    sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, addr);
  +    dev = sysbus_create_simple(qom_type, addr, NULL);

then manually removing the 'dev' variable to avoid:

  error: variable 'dev' set but not used [-Werror,-Wunused-but-set-variable]

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 hw/m68k/next-cube.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/hw/m68k/next-cube.c b/hw/m68k/next-cube.c
index 5d244b3b95..d17e6be8e1 100644
--- a/hw/m68k/next-cube.c
+++ b/hw/m68k/next-cube.c
@@ -950,7 +950,6 @@ static void next_cube_init(MachineState *machine)
     MemoryRegion *bmapm2 = g_new(MemoryRegion, 1);
     MemoryRegion *sysmem = get_system_memory();
     const char *bios_name = machine->firmware ?: ROM_FILE;
-    DeviceState *dev;
     DeviceState *pcdev;
 
     /* Initialize the cpu core */
@@ -974,9 +973,7 @@ static void next_cube_init(MachineState *machine)
     memory_region_add_subregion(sysmem, 0x04000000, machine->ram);
 
     /* Framebuffer */
-    dev = qdev_new(TYPE_NEXTFB);
-    sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
-    sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, 0x0B000000);
+    sysbus_create_simple(TYPE_NEXTFB, 0x0B000000, NULL);
 
     /* MMIO */
     sysbus_mmio_map(SYS_BUS_DEVICE(pcdev), 0, 0x02000000);
@@ -993,9 +990,7 @@ static void next_cube_init(MachineState *machine)
     memory_region_add_subregion(sysmem, 0x820c0000, bmapm2);
 
     /* KBD */
-    dev = qdev_new(TYPE_NEXTKBD);
-    sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
-    sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, 0x0200e000);
+    sysbus_create_simple(TYPE_NEXTKBD, 0x0200e000, NULL);
 
     /* Load ROM here */
     /* still not sure if the rom should also be mapped at 0x0*/
-- 
2.41.0

Am Fri, 20 Oct 2023 17:06:25 +0200
schrieb Philippe Mathieu-Daudé <philmd@linaro.org>:

> Mechanical change using the following coccinelle script:
> 
>   @@
>   identifier dev;
>   identifier sbd;
>   expression qom_type;
>   expression addr;
>   @@
>   -    dev = qdev_new(qom_type);
>   -    sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
>   -    sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, addr);
>   +    dev = sysbus_create_simple(qom_type, addr, NULL);
> 
> then manually removing the 'dev' variable to avoid:
> 
>   error: variable 'dev' set but not used [-Werror,-Wunused-but-set-variable]
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> ---

Tested-by: Thomas Huth <huth@tuxfamily.org>
Reviewed-by: Thomas Huth <huth@tuxfamily.org>