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From: Li Qiang <liqiang6-s@360.cn>
Date: Wed, 14 Dec 2016 18:30:21 -0800
Subject: [PATCH] audio: ac97: add exit function
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Currently the ac97 device emulation doesn't have a exit function,
hot unplug this device will leak some memory. Add a exit function to
avoid this.

Signed-off-by: Li Qiang <liqiang6-s@360.cn>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-id: 58520052.4825ed0a.27a71.6cae@mx.google.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 12351a91da97b414eec8cdb09f1d9f41e535a401)
---
 hw/audio/ac97.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/hw/audio/ac97.c b/hw/audio/ac97.c
index cbd959e..c306575 100644
--- a/hw/audio/ac97.c
+++ b/hw/audio/ac97.c
@@ -1387,6 +1387,16 @@ static void ac97_realize(PCIDevice *dev, Error **errp)
     ac97_on_reset (&s->dev.qdev);
 }
 
+static void ac97_exit(PCIDevice *dev)
+{
+    AC97LinkState *s = DO_UPCAST(AC97LinkState, dev, dev);
+
+    AUD_close_in(&s->card, s->voice_pi);
+    AUD_close_out(&s->card, s->voice_po);
+    AUD_close_in(&s->card, s->voice_mc);
+    AUD_remove_card(&s->card);
+}
+
 static int ac97_init (PCIBus *bus)
 {
     pci_create_simple (bus, -1, "AC97");
@@ -1404,6 +1414,7 @@ static void ac97_class_init (ObjectClass *klass, void *data)
     PCIDeviceClass *k = PCI_DEVICE_CLASS (klass);
 
     k->realize = ac97_realize;
+    k->exit = ac97_exit;
     k->vendor_id = PCI_VENDOR_ID_INTEL;
     k->device_id = PCI_DEVICE_ID_INTEL_82801AA_5;
     k->revision = 0x01;