[PATCH 3/3] hw/ide/ich.c: Use qemu_init_irq_child() to avoid memory leak

[Peter Maydell]

The ICH9 PCI device uses qemu_init_irq() in its instance_init method,
but fails to clean it up in its uninit. This results in a leak,
detected by ASAN when running the device-introspect-test:

Direct leak of 96 byte(s) in 1 object(s) allocated from:
    #0 0x58f3b53ecde3 in malloc 
(/mnt/nvmedisk/linaro/qemu-from-laptop/qemu/build/arm-asan/qem
u-system-arm+0x21f1de3) (BuildId: 8dcd38b1d76bd7bd44f905c38200f4cceafd7ca4)
    #1 0x72e446dd5b09 in g_malloc 
(/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x62b09) (BuildId: 1
eb6131419edb83b2178b682829a6913cf682d75)
    #2 0x72e446db745a in g_hash_table_new_full 
(/lib/x86_64-linux-gnu/libglib-2.0.so.0+0x4445a
) (BuildId: 1eb6131419edb83b2178b682829a6913cf682d75)
    #3 0x58f3b7c6fc67 in object_initialize_with_type 
/mnt/nvmedisk/linaro/qemu-from-laptop/qem
u/build/arm-asan/../../qom/object.c:568:23
    #4 0x58f3b7c6f670 in object_initialize 
/mnt/nvmedisk/linaro/qemu-from-laptop/qemu/build/ar
m-asan/../../qom/object.c:578:5
    #5 0x58f3b7c6611b in qemu_init_irq 
/mnt/nvmedisk/linaro/qemu-from-laptop/qemu/build/arm-asan/../../hw/core/irq.c:48:5
    #6 0x58f3b5c6e931 in pci_ich9_ahci_init 
/mnt/nvmedisk/linaro/qemu-from-laptop/qemu/build/arm-asan/../../hw/ide/ich.c:117:5

We could call qemu_free_irq() in pci_ich9_uninit(), but
since we have a method of initializing the IRQ that doesn't
need manual freeing, use that instead: qemu_init_irq_child().

Signed-off-by: Peter Maydell <peter.mayd...@linaro.org>
---
 hw/ide/ich.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hw/ide/ich.c b/hw/ide/ich.c
index 4cade0d1219..b00987f08d4 100644
--- a/hw/ide/ich.c
+++ b/hw/ide/ich.c
@@ -114,7 +114,8 @@ static void pci_ich9_ahci_init(Object *obj)
 {
     AHCIPCIState *d = ICH9_AHCI(obj);
 
-    qemu_init_irq(&d->irq, pci_ich9_ahci_update_irq, d, 0);
+    qemu_init_irq_child(obj, "update-irq", &d->irq,
+                        pci_ich9_ahci_update_irq, d, 0);
     ahci_init(&d->ahci, DEVICE(obj));
     d->ahci.irq = &d->irq;
 }
-- 
2.43.0