tree addd0c8947a267ae5e71bcdf98d8ca29c6061205
parent 0887188c6b133b69142965d65e1be8a0696a6272
author Vadim Yanitskiy <vyanitskiy@sysmocom.de> 1701288545 +0700
committer laforge <laforge@osmocom.org> 1701569973 +0000

soft_uart: check Rx/Tx state once in osmo_soft_uart_{rx,tx}_ubits()

Check it once rather than doing this in a loop.  Return -EAGAIN if
Rx or Tx is not enabled when calling osmo_soft_uart_{rx,tx}_ubits().

This [theoretically] improves performance by reducing the number of
conditional statements in loops.  In the Tx path, this also prevents
calling the .tx_cb() when the transmitter is disabled, so that we
don't loose the application data.

Change-Id: I70f93b3655eb21c2323e451052c40cd305c016c8
Related: OS#4396