[Bug 1509896] Re: IPMI USB SCSI endpoint discovery can fail on OpenPower machines

[Mathieu Trudel-Lapierre]

** Description changed:

- The current ipmitool code can fail to find an IPMI device on my
- OpenPower machine, due to bug in the USB SCSI device discovery process.
+ [Impact]
+ The current ipmitool code can fail to find an IPMI device on my OpenPower machine, due to bug in the USB SCSI device discovery process.
  
  This will only happen if the user has adjusted the number of virtual USB
  devices that the BMC exports. However, the failure mode isn't obvious,
  and it prevents the user from using the 'USB' IPMI channel, which is
  required for firmware upgrades.
  
  This is fixed in upstream commit 607cfe6f4, can we backport this to the
  Ubuntu ipmitool for versions at 1.8.15 or earlier?
+ 
+ [Test case]
+ 1- Increase number of virtual USB devices exported by BMC
+ 2- Run ipmitool -I usb lan print
+ 
+ [Regression Potential]
+ Low potential for regression. This increases the number of devices allowed for SCSI; since following spec there may be up to 16 devices on a bus. This might cause issues still for out of spec systems with more devices on the bus, or buggy BIOS incorrectly cleaning up memory for devices that are not present (ie. non-zeroed memory that could make ipmi think there is a device when there is not).

** Changed in: ipmitool (Ubuntu Vivid)
       Status: New => In Progress

** Changed in: ipmitool (Ubuntu Wily)
       Status: New => In Progress

** Changed in: ipmitool (Ubuntu Vivid)
     Assignee: (unassigned) => Mathieu Trudel-Lapierre (mathieu-tl)

** Changed in: ipmitool (Ubuntu Wily)
     Assignee: (unassigned) => Mathieu Trudel-Lapierre (mathieu-tl)

** Changed in: ipmitool (Ubuntu Trusty)
     Assignee: (unassigned) => Mathieu Trudel-Lapierre (mathieu-tl)

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https://bugs.launchpad.net/bugs/1509896

Title:
  IPMI USB SCSI endpoint discovery can fail on OpenPower machines

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