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+++ This bug was initially created as a clone of Bug #908274 +++

Description of problem:
When try to get parent of nodedev if there is no parent,libvirt-tck get error.


Version-Release number of selected component (if applicable):
libvirt-0.10.2-17.el6.x86_64
perl-Sys-Virt-0.10.2-5.el6.x86_64
kernel-2.6.32-348.el6.x86_64
qemu-kvm-rhev-0.12.1.2-2.348.el6.x86_64


How reproducible:
100%

Steps to Reproduce:
1.in libvirt-tck script,added
.....
my @nodelist = $conn->list_all_node_devices();
  foreach my $dev (@nodelist){
  my $parent = $dev->get_parent();
  diag $parent;
}
.....

Actual results:

libvirt error code: 0, message: Unknown problem



Expected results:
should return "undef"

Additional info:
the first item in nodelist is "computer",no parent.
use python interface can return "None".

--- Additional comment from Daniel Berrange on 2013-08-06 14:29:00 BST ---

commit 04470fa5412cbd04386c5c2e785e4672cc6e0e0f
Author: Daniel P. Berrange <berrange>
Date:   Tue Aug 6 14:23:55 2013 +0100

    Fix error handling for virNodeDeviceGetParent()
    
    It is valid for virNodeDeviceGetParent() to return NULL in the
    case where there is no parent device present.
    
    Signed-off-by: Daniel P. Berrange <berrange>

verify with perl-Sys-Virt-1.1.1-2.el7.x86_64

step:
.....
my @nodelist = $conn->list_all_node_devices();
  foreach my $dev (@nodelist){
  my $parent = $dev->get_parent();
  diag $parent;
}
.....

output msg:
# parent ===== 
# parent ===== computer
# parent ===== computer
# parent ===== computer

no libvirt error occured. move to verified.

This request was resolved in Red Hat Enterprise Linux 7.0.

Contact your manager or support representative in case you have further questions about the request.