tree 42270bc09bafb3aac48a592f6846db8ebbc8b2c2
parent 8b8bcc8700af5ba1d435c7cf0f6467b2b6a8c679
author Adrian Ambrożewicz <adrian.ambrozewicz@linux.intel.com> 1596717758 +0200
committer Adrian Ambrożewicz <adrian.ambrozewicz@linux.intel.com> 1597303609 +0000

Fix detection of invalid 'GetSensorReading'

This change fixes incorrect way to determine Get Sensor Reading value
availability.

In previous implementation proper value of '0' was treated as error.

IPMI spec defines 'reading/state unavailable' bit, which ME uses to
inform user about sensor reading being absent.
This change monitors that bit to determine outcome of Get Sensor Reading
call.

Alternative considered was to also look at 'sensor scanning disabled',
but after reading more documentation and checking ME implementation it
turns out that it affects only threshold events generation.

Testing:
- verified that 'nan' is set for unavailable sensor (PSU with PMBUS
  cable cut-off)
- verified that for available sensor reporting '0', '0' value is
  present instead of 'nan'

Signed-off-by: Adrian Ambrożewicz <adrian.ambrozewicz@linux.intel.com>
Change-Id: Iaa940b808e36b9606fe78f7cef7bab2593275889