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According to commit b4e0299d if networkAllocateActualDevice() was successful, it will *always* allocate an iface->data.network.actual, so we can use this during networkReleaseActualDevice() to know if there is really anything to undo. We were properly using this information to only decrement the network connections counter if it had previously been incremented, but we were unconditionally unplugging bandwidth and calling the "unplugged" network hook for *all* interfaces (during qemuProcessStop()) whether they had been previously plugged or not. This caused problems if a domain failed to start at some time prior to all interfaces being allocated. (I encountered this when an interface had a bandwidth floor set but no inbound QoS). This patch changes both the call to networkUnplugBandwidth() and the call to networkRunHook() to only be called if there was a previous call to "plug" for the same interface.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>