<p></p>
<p><b>@miri64</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/15484#discussion_r527711410">core/include/mbox.h</a>:</p>
<pre style='color:#555'>> @@ -185,6 +185,17 @@ static inline size_t mbox_avail(mbox_t *mbox)
     return cib_avail(&mbox->cib);
 }
 
+/**
+ * @brief   Unset's the mbox, effectively deinitializing invalidating it.
</pre>
<blockquote>
<p>Why is this needed?</p>
</blockquote>
<p>Scroll the code and you see, that lwIP requires a way to invalidate their mboxes and check the validiy.</p>
<p><a href="https://github.com/RIOT-OS/RIOT/blob/dd1de91c636bc98956bc40fd904df2ee4b213ed2/pkg/lwip/include/arch/sys_arch.h#L101-L111">https://github.com/RIOT-OS/RIOT/blob/dd1de91c636bc98956bc40fd904df2ee4b213ed2/pkg/lwip/include/arch/sys_arch.h#L101-L111</a></p>
<p>I agree that the current approach is not the correct one, maybe. Any idea how we should proceed with that?</p>
<blockquote>
<p>(I suggest splitting, the other changes were already ACKed...)</p>
</blockquote>
<p>Can do.</p>

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