<p></p>
<p><b>@benpicco</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/16716#discussion_r685065223">cpu/cc2538/radio/cc2538_rf_radio_ops.c</a>:</p>
<pre style='color:#555'>> +    cc2538_tx_busy = true;
     if (cc2538_csma_ca_retries < 0) {
</pre>
<p>shouldn't this only be set in the <code>else</code> branch?</p>

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