[Qemu-devel] [PATCH 08/28] qdev: use a wrapper to access reset and promote reset to a class method

[Anthony Liguori <aliguori@us.ibm.com>]

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
---
 hw/intel-hda.c  |    4 +---
 hw/lsi53c895a.c |    2 +-
 hw/qdev.c       |   22 +++++++++++++++++-----
 hw/qdev.h       |    8 ++++++++
 4 files changed, 27 insertions(+), 9 deletions(-)

diff --git a/hw/intel-hda.c b/hw/intel-hda.c
index 8cb92d3..6e1c5de 100644
--- a/hw/intel-hda.c
+++ b/hw/intel-hda.c
@@ -1116,9 +1116,7 @@ static void intel_hda_reset(DeviceState *dev)
     /* reset codecs */
     QTAILQ_FOREACH(qdev, &d->codecs.qbus.children, sibling) {
         cdev = DO_UPCAST(HDACodecDevice, qdev, qdev);
-        if (qdev_get_info(qdev)->reset) {
-            qdev_get_info(qdev)->reset(qdev);
-        }
+        device_reset(DEVICE(cdev));
         d->state_sts |= (1 << cdev->cad);
     }
     intel_hda_update_irq(d);
diff --git a/hw/lsi53c895a.c b/hw/lsi53c895a.c
index 9f475e0..3a87171 100644
--- a/hw/lsi53c895a.c
+++ b/hw/lsi53c895a.c
@@ -1681,7 +1681,7 @@ static void lsi_reg_writeb(LSIState *s, int offset, uint8_t val)
                 DeviceState *dev;
 
                 QTAILQ_FOREACH(dev, &s->bus.qbus.children, sibling) {
-                    qdev_get_info(dev)->reset(dev);
+                    device_reset(dev);
                 }
                 s->sstat0 |= LSI_SSTAT0_RST;
                 lsi_script_scsi_interrupt(s, LSI_SIST0_RST, 0);
diff --git a/hw/qdev.c b/hw/qdev.c
index 5da94a8..a80ca7c 100644
--- a/hw/qdev.c
+++ b/hw/qdev.c
@@ -48,7 +48,12 @@ static BusState *qbus_find(const char *path);
 static void qdev_subclass_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
+
     dc->info = data;
+    dc->reset = dc->info->reset;
+
+    /* Poison to try to detect future uses */
+    dc->info->reset = NULL;
 }
 
 DeviceInfo *qdev_get_info(DeviceState *dev)
@@ -378,8 +383,8 @@ int qdev_init(DeviceState *dev)
                                        dev->alias_required_for_version);
     }
     dev->state = DEV_STATE_INITIALIZED;
-    if (dev->hotplugged && qdev_get_info(dev)->reset) {
-        qdev_get_info(dev)->reset(dev);
+    if (dev->hotplugged) {
+        device_reset(dev);
     }
     return 0;
 }
@@ -407,9 +412,7 @@ int qdev_unplug(DeviceState *dev)
 
 static int qdev_reset_one(DeviceState *dev, void *opaque)
 {
-    if (qdev_get_info(dev)->reset) {
-        qdev_get_info(dev)->reset(dev);
-    }
+    device_reset(dev);
 
     return 0;
 }
@@ -1593,6 +1596,15 @@ void qdev_machine_init(void)
     qdev_get_peripheral();
 }
 
+void device_reset(DeviceState *dev)
+{
+    DeviceClass *klass = DEVICE_GET_CLASS(dev);
+
+    if (klass->reset) {
+        klass->reset(dev);
+    }
+}
+
 static TypeInfo device_type_info = {
     .name = TYPE_DEVICE,
     .parent = TYPE_OBJECT,
diff --git a/hw/qdev.h b/hw/qdev.h
index a6af632..f3c9219 100644
--- a/hw/qdev.h
+++ b/hw/qdev.h
@@ -75,6 +75,7 @@ typedef struct DeviceProperty
 typedef struct DeviceClass {
     ObjectClass parent_class;
     DeviceInfo *info;
+    void (*reset)(DeviceState *dev);
 } DeviceClass;
 
 /* This structure should not be accessed directly.  We declare it here
@@ -647,4 +648,11 @@ char *qdev_get_type(DeviceState *dev, Error **errp);
  */
 void qdev_machine_init(void);
 
+/**
+ * @device_reset
+ *
+ * Reset a single device (by calling the reset method).
+ */
+void device_reset(DeviceState *dev);
+
 #endif
-- 
1.7.4.1