tree 3a7c5ffadf7fa7c1c27294dc3e200c3aaeefa281
parent 5a124ea01282f27ec28f6ce801dd1a523bc7b1ad
author Andrew Jeffery <andrew@aj.id.au> 1542922417 +1100
committer Andrew Jeffery <andrew@aj.id.au> 1543208072 +1100

protocol: Rework publication of events over DBus transport

A set of races was discovered around the propagation of HIOMAP protocol
BMC status events during BMC shutdown. In particular the change impacts
the design of the DBus transport defined in the protocol specification,
as signalling of both acknowledgeable and non-acknowledgeable events
could not be made atomic.

A particular case where this matters is when the daemon is terminated,
at which point it should simultaneously clear BMC_EVENT_DAEMON_READY and
set BMC_EVENT_PROTOCOL_RESET. The DBus interface as designed required
this be done as two separate messages, which lead to races propagating
the complete state update to the host during shutdown of ipmid.

Change-Id: Iaf38f77c28b8e4e4dd092b0de97dc7e777bfac65
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>