hw/irq: New qemu_init_irq_child() function

The qemu_init_irq() function initializes a TYPE_IRQ QOM object.  The
caller is therefore responsible for eventually calling
qemu_free_irq() to unref (and thus free) it.

In many places where we want to initialize an IRQ we are in
the init/realize of some other QOM object; if we have a variant
of this function that calls object_initialize_child() then the
IRQ will be automatically cleaned up when its parent object is
destroyed, and we don't need to remember to manually free it.

Implement qemu_init_irq_child(), which is to qemu_init_irq()
what object_initialize_child() is to object_initialize().

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20250821154053.2417090-2-peter.maydell@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/hw/core/irq.c b/hw/core/irq.c
index 6dd8d47bd6..0c768f7704 100644
--- a/hw/core/irq.c
+++ b/hw/core/irq.c
@@ -49,6 +49,14 @@ void qemu_init_irq(IRQState *irq, qemu_irq_handler handler, void *opaque,
     init_irq_fields(irq, handler, opaque, n);
 }
 
+void qemu_init_irq_child(Object *parent, const char *propname,
+                         IRQState *irq, qemu_irq_handler handler,
+                         void *opaque, int n)
+{
+    object_initialize_child(parent, propname, irq, TYPE_IRQ);
+    init_irq_fields(irq, handler, opaque, n);
+}
+
 void qemu_init_irqs(IRQState irq[], size_t count,
                     qemu_irq_handler handler, void *opaque)
 {