network: don't even call networkRunHook if there is no network

networkAllocateActualDevice() is called for *all* interfaces, not just
those with type='network'. In that case, it will jump down to its
validate: label immediately, without allocating anything. After
validation is done, two counters are potentially updated (one for the
network, and one for any particular physical device that is chosen),
and then networkRunHook() is called.

This patch refactors that code a slight bit so that networkRunHook()
doesn't get called if netdef is NULL (i.e. type != network) and to
place the conditional increment of dev->connections inside the "if
(netdef)" as well - dev can never be non-null if netdef is null
(because "dev" is the pointer to a device in a network's pool of
devices), so this doesn't have any functional effect, it just makes
the code clearer.

diff --git a/src/network/bridge_driver.c b/src/network/bridge_driver.c
index 152bd06b03d0cef1eaaa0c3f3efd8e67fbd84dd7..3fb5ad321d3a6f0889da389efc5d9a8d412c573d 100644 (file)
--- a/src/network/bridge_driver.c
+++ b/src/network/bridge_driver.c
@@ -3662,36 +3662,35 @@ validate:
         }
     }
 
-    if (dev) {
-        /* mark the allocation */
-        dev->connections++;
-        if (actualType != VIR_DOMAIN_NET_TYPE_HOSTDEV) {
-            VIR_DEBUG("Using physical device %s, %d connections",
-                      dev->device.dev, dev->connections);
-        } else {
-            VIR_DEBUG("Using physical device %04x:%02x:%02x.%x, connections %d",
-                      dev->device.pci.domain, dev->device.pci.bus,
-                      dev->device.pci.slot, dev->device.pci.function,
-                      dev->connections);
-        }
-    }
-
     if (netdef) {
         netdef->connections++;
         VIR_DEBUG("Using network %s, %d connections",
                   netdef->name, netdef->connections);
-    }
 
-    /* finally we can call the 'plugged' hook script if any */
-    if (networkRunHook(network, dom, iface,
-                       VIR_HOOK_NETWORK_OP_IFACE_PLUGGED,
-                       VIR_HOOK_SUBOP_BEGIN) < 0) {
-        /* adjust for failure */
-        if (dev)
-            dev->connections--;
-        if (netdef)
+        if (dev) {
+            /* mark the allocation */
+            dev->connections++;
+            if (actualType != VIR_DOMAIN_NET_TYPE_HOSTDEV) {
+                VIR_DEBUG("Using physical device %s, %d connections",
+                          dev->device.dev, dev->connections);
+            } else {
+                VIR_DEBUG("Using physical device %04x:%02x:%02x.%x, connections %d",
+                          dev->device.pci.domain, dev->device.pci.bus,
+                          dev->device.pci.slot, dev->device.pci.function,
+                          dev->connections);
+            }
+        }
+
+        /* finally we can call the 'plugged' hook script if any */
+        if (networkRunHook(network, dom, iface,
+                           VIR_HOOK_NETWORK_OP_IFACE_PLUGGED,
+                           VIR_HOOK_SUBOP_BEGIN) < 0) {
+            /* adjust for failure */
             netdef->connections--;
-        goto error;
+            if (dev)
+                dev->connections--;
+            goto error;
+        }
     }
 
     ret = 0;