blkdev_name_to_number issues while running xenU

[Arun Sharma <arun.sharma@intel.com>]

Anytime I try to start xenU, it fails the first time with the traces 
below. The second invocation is ok (but doesn't boot yet - still debugging).

blkdev_name_to_number() failures don't seem to be benign this time..

	-Arun

Traceback (most recent call last):
   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 566, in construct
     self.configure()
   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 967, in configure
     self.create_devices()
   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 796, in 
create_devices
     self.create_configured_devices()
   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 785, in 
create_configured_devices
     self.createDevice(ctrl_type, dev_config)
   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 410, in 
createDevice
     backdb['physical-device'] = "%li" % blkdev_name_to_number(node)
   File "/usr/lib/python/xen/util/blkif.py", line 27, in 
blkdev_name_to_number
     if re.match( '/dev/sd[a-p]([1-9]|1[0-5])?', n):
   File "/usr/lib/python2.3/sre.py", line 132, in match
     return _compile(pattern, flags).match(string)
TypeError: expected string or buffer
Traceback (most recent call last):
   File "/usr/lib/python/xen/xend/server/SrvDomainDir.py", line 78, in 
op_create
     dominfo = self.xd.domain_create(config)
   File "/usr/lib/python/xen/xend/XendDomain.py", line 292, in domain_create
     dominfo = XendDomainInfo.create(self.dbmap, config)
   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 161, in create
     vm.construct(config)
   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 573, in construct
     self.destroy()
   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 694, in destroy
     self.cleanup()
   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 665, in cleanup
     self.release_devices()
   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 717, in 
release_devices
     Blkctl.block('unbind', devdb['type'].getData(),
   File "/usr/lib/python/xen/xend/xenstore/xsobj.py", line 425, in 
__getitem__
     v = self.readChildDB(k)
   File "/usr/lib/python/xen/xend/xenstore/xsobj.py", line 521, in 
readChildDB
     raise LookupError("invalid key '%s'" % k)
LookupError: invalid key 'type'