[Xen-changelog] [xen-unstable] xend/pvscsi: fix passing of SCSI control LUNs

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Olaf Hering <olaf@xxxxxxxxx>
# Date 1349695111 -3600
# Node ID eecb528583d7dc30db3801fac09c79434f7e7835
# Parent  fe756682cc7f44a2471fdfdca96f1f8860f0bb73
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

Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
Committed-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---


diff -r fe756682cc7f -r eecb528583d7 tools/python/xen/util/vscsi_util.py
--- a/tools/python/xen/util/vscsi_util.py       Mon Oct 08 12:18:31 2012 +0100
+++ b/tools/python/xen/util/vscsi_util.py       Mon Oct 08 12:18:31 2012 +0100
@@ -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

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