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xen/xen-bug776995-pvscsi-no-devname.patch

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xend/pvscsi: fix passing of SCSI control LUNs
Currently pvscsi can not pass SCSI devices that have just a scsi_generic node.
In the following example sg3 is a control LUN for the disk sdd.
But vscsi=['4:0:2:0,0:0:0:0'] does not work because the internal 'devname'
variable remains None. Later writing p-devname to xenstore fails because None
is not a valid string variable.
Since devname is used for just informational purpose use sg also as devname.
carron:~ $ lsscsi -g
[0:0:0:0] disk ATA FK0032CAAZP HPF2 /dev/sda /dev/sg0
[4:0:0:0] disk HP P2000G3 FC/iSCSI T100 /dev/sdb /dev/sg1
[4:0:1:0] disk HP P2000G3 FC/iSCSI T100 /dev/sdc /dev/sg2
[4:0:2:0] storage HP HSV400 0950 - /dev/sg3
[4:0:2:1] disk HP HSV400 0950 /dev/sdd /dev/sg4
[4:0:3:0] storage HP HSV400 0950 - /dev/sg5
[4:0:3:1] disk HP HSV400 0950 /dev/sde /dev/sg6
---
tools/python/xen/util/vscsi_util.py | 2 ++
1 file changed, 2 insertions(+)
Index: xen-4.1.2-testing/tools/python/xen/util/vscsi_util.py
===================================================================
--- xen-4.1.2-testing.orig/tools/python/xen/util/vscsi_util.py
+++ xen-4.1.2-testing/tools/python/xen/util/vscsi_util.py
@@ -105,6 +105,8 @@ def _vscsi_get_scsidevices_by_lsscsi(opt
devname = None
try:
sg = s[-1].split('/dev/')[1]
+ if devname is None:
+ devname = sg
scsi_id = _vscsi_get_scsiid(sg)
except IndexError:
sg = None