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Re: [libvirt] [PATCH] network: don't even call networkRunHook if there is no network



On 25.02.2014 16:46, Laine Stump wrote:
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.
---
  src/network/bridge_driver.c | 47 ++++++++++++++++++++++-----------------------
  1 file changed, 23 insertions(+), 24 deletions(-)

diff --git a/src/network/bridge_driver.c b/src/network/bridge_driver.c
index 152bd06..3fb5ad3 100644
--- 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;


I thought this problem was solved by 83c404ff. I wonder what went wrong. Or maybe nothing is actually wrong, and this is merely just a refactoring.

Michal


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