RTEMS | dev/ns16550: Fix race condition in transmit path (!1210)

[Sebastian Huber (@sebhub)]

Sebastian Huber created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1210

Project:Branches: sebhub/rtems:fix-ns16550 to rtems/rtos/rtems:main
Author:   Sebastian Huber
Assignee: Sebastian Huber


## Summary

dev/ns16550: Fix race condition in transmit path

In SMP systems, the interrupt handler may run concurrently with tasks
trying to transmit.  Properly protect the transmit state through the
device lock.  Simplify the transmit process.

Close #5552.

Signed-off-by: Sebastian Huber <sebastian.huber at embedded-brains.de>





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