hw/bt: Introduce separate list for synchronous messages

[ Upstream commit 61978c2c54d082b6f29f492e898e59d6198cfb5f ]

BT send logic always sends top of bt message list to BMC. Once BMC reads the
message, it clears the interrupt and bt_idle() becomes true.

bt_add_ipmi_msg_head() adds message to top of the list. If bt message list
is not empty then:
  - if bt_idle() is true then we will endup sending message to BMC before
    getting response from BMC for inflight message. Looks like on some
    BMC implementation this results in message timeout.
  - else we endup starting message timer without actually sending message
    to BMC.. which is not correct.

This patch introduces separate list to track synchronous messages.
bt_add_ipmi_msg_head() will add messages to tail of this new list. We
will always process this queue before processing normal queue.

Finally this patch introduces new variable (inflight_bt_msg) to track
inflight message. This will point to current inflight message.

Suggested-by: Oliver O'Halloran <oohall@gmail.com>
Suggested-by: Stewart Smith <stewart@linux.ibm.com>
Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>

0 files changed, 0 insertions, 0 deletions