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virDomainPCIAddressGetNextSlot() starts searching from the last allocated address and goes to the end of all the buses, then goes back to the first bus and searches from there up to the starting point (in case any address has been freed since the last time an address was allocated. The loops for these two are almost, but not exactly, the same, so they have remained as separate loops with the same code inside the loop. To lessen maintenance headaches, the identical code has been moved out into the function virDomainPCIAddressFindUnusedFunctionOnBus(), which is called in place of the loop contents.
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>