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Description of problem:
the reture value of API virNodeDevice.listCaps() is not correct

Version-Release number of selected component:
libvirt-1.1.1-29.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1. find one rhel7 host, and check the libvirt python API
# python 
Python 2.7.5 (default, Feb 11 2014, 07:46:25) 
[GCC 4.8.2 20140120 (Red Hat 4.8.2-13)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import libvirt
>>> conn = libvirt.open('')
>>> node_obj = conn.nodeDeviceLookupByName('pci_0000_00_19_0')
>>> node_capabilities = node_obj.listCaps()

2. check the return value of API virNodeDevice.listCaps(), it's NULL.
>>> print node_capabilities
[]

3. find one rhel6 host, run the same scenario, it will return the expect value.
......
>>> print node_capabilities
['pci']

Actual result:
As step 2

Expected results:
The return value should not be NULL, should be samilar with step 3.

Additional info:
Check the python API on rhel6 and rhel7, it's same.

Fixed by commit 15a173fc13b4a16707a0d88b17a8a631791a4083
Author:     Jincheng Miao <jmiao>
CommitDate: 2014-03-29 06:51:10 +0100

    Fix virNodeDeviceListCaps always returns empty
    
    virNodeDeviceListCaps will always return empty for a pci nodedevice,
    actually it should return 'pci'.
    
    It is because the loop variable ncaps isn't increased.
    
    Introduced by commit be2636f.
    
    https://bugzilla.redhat.com/show_bug.cgi?id=1081932
    
    Signed-off-by: Jincheng Miao <jmiao>
    Signed-off-by: Ján Tomko <jtomko>

git describe: v1.2.3-rc1-9-g15a173f

Verify it as follows. The result is expected. Move its status to VERIFIED.

# rpm -q libvirt libvirt-python
libvirt-1.2.8-8.el7.x86_64
libvirt-python-1.2.8-5.el7.x86_64


# cat test.py 
import libvirt

conn = libvirt.open('')
nodedev = conn.nodeDeviceLookupByName('pci_0000_00_19_0')
node_capabilities = nodedev.listCaps()
print node_capabilities

# python test.py
['pci']

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2015-0323.html