nodedev: reset active config data on udev remove event

When a mdev device is destroyed or stopped the udev remove event
handling needs to reset the active config data of the node object
representing a persisted mdev.

Reviewed-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: Jonathon Jongsma <jjongsma@redhat.com>
Signed-off-by: Boris Fiuczynski <fiuczy@linux.ibm.com>

src/conf/node_device_conf.c

@@ -2581,15 +2581,9 @@ virNodeDevCapsDefFree(virNodeDevCapsDef *caps)
         g_free(data->sg.path);
         break;
     case VIR_NODE_DEV_CAP_MDEV:
-        g_free(data->mdev.defined_config.type);
-        g_free(data->mdev.active_config.type);
         g_free(data->mdev.uuid);
-        for (i = 0; i < data->mdev.defined_config.nattributes; i++)
-            virMediatedDeviceAttrFree(data->mdev.defined_config.attributes[i]);
-        g_free(data->mdev.defined_config.attributes);
-        for (i = 0; i < data->mdev.active_config.nattributes; i++)
-            virMediatedDeviceAttrFree(data->mdev.active_config.attributes[i]);
-        g_free(data->mdev.active_config.attributes);
+        virMediatedDeviceConfigClear(&data->mdev.defined_config);
+        virMediatedDeviceConfigClear(&data->mdev.active_config);
         g_free(data->mdev.parent_addr);
         break;
     case VIR_NODE_DEV_CAP_CSS_DEV:

src/libvirt_private.syms

@@ -2765,6 +2765,8 @@ virMacMapWriteFile;
 # util/virmdev.h
 virMediatedDeviceAttrFree;
 virMediatedDeviceAttrNew;
+virMediatedDeviceConfigClear;
+virMediatedDeviceConfigFree;
 virMediatedDeviceFree;
 virMediatedDeviceGetIOMMUGroupDev;
 virMediatedDeviceGetIOMMUGroupNum;

src/node_device/node_device_driver.c

@@ -2016,6 +2016,19 @@ nodeDeviceDefCopyFromMdevctl(virNodeDeviceDef *dst,
 }
 
 
+/* A mediated device definition contains data from mdevctl about the active
+ * device. When the device is deactivated the active configuration data needs
+ * to be removed. */
+void
+nodeDeviceDefResetMdevActiveConfig(virNodeDeviceDef *def)
+{
+    if (def->caps->data.type != VIR_NODE_DEV_CAP_MDEV)
+        return;
+
+    virMediatedDeviceConfigClear(&def->caps->data.mdev.active_config);
+}
+
+
 int
 nodeDeviceSetAutostart(virNodeDevice *device,
                        int autostart)

src/node_device/node_device_driver.h

@@ -197,3 +197,6 @@ int
 nodeDeviceUpdate(virNodeDevice *dev,
                  const char *xmlDesc,
                  unsigned int flags);
+
+void
+nodeDeviceDefResetMdevActiveConfig(virNodeDeviceDef *def);

src/node_device/node_device_udev.c

@@ -1464,6 +1464,7 @@ udevRemoveOneDeviceSysPath(const char *path)
     if (virNodeDeviceObjIsPersistent(obj)) {
         VIR_FREE(def->sysfs_path);
         virNodeDeviceObjSetActive(obj, false);
+        nodeDeviceDefResetMdevActiveConfig(def);
     } else {
         VIR_DEBUG("Removing device '%s' with sysfs path '%s'",
                   def->name, path);

src/util/virmdev.c

@@ -516,6 +516,26 @@ void virMediatedDeviceAttrFree(virMediatedDeviceAttr *attr)
     g_free(attr);
 }
 
+void virMediatedDeviceConfigFree(virMediatedDeviceConfig *config)
+{
+    if (!config)
+        return;
+
+    virMediatedDeviceConfigClear(config);
+    g_free(config);
+}
+
+void virMediatedDeviceConfigClear(virMediatedDeviceConfig *config)
+{
+    size_t i = 0;
+
+    g_clear_pointer(&config->type, g_free);
+    for (i = 0; i < config->nattributes; i++)
+        virMediatedDeviceAttrFree(config->attributes[i]);
+    config->nattributes = 0;
+    g_clear_pointer(&config->attributes, g_free);
+}
+
 
 #define MDEV_BUS_DIR "/sys/class/mdev_bus"
 

src/util/virmdev.h

@@ -54,6 +54,10 @@ struct _virMediatedDeviceConfig {
     size_t nattributes;
 };
 
+void virMediatedDeviceConfigClear(virMediatedDeviceConfig *config);
+void virMediatedDeviceConfigFree(virMediatedDeviceConfig *config);
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(virMediatedDeviceConfig, virMediatedDeviceConfigFree);
+
 typedef struct _virMediatedDeviceType virMediatedDeviceType;
 struct _virMediatedDeviceType {
     char *id;