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This is an automatically generated e-mail. To reply, visit:
<a href="https://reviewboard.asterisk.org/r/1563/">https://reviewboard.asterisk.org/r/1563/</a>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This is really close to being ready to go. Just a couple of things to comment about.</pre>
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<a href="https://reviewboard.asterisk.org/r/1563/diff/2/?file=21625#file21625line14395" style="color: black; font-weight: bold; text-decoration: underline;">trunk/channels/chan_sip.c</a>
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(Diff revision 2)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void mwi_event_cb(const struct ast_event *event, void *userdata)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ao2_ref</span><span class="p">(</span><span class="n">peer</span><span class="p">,</span> <span class="mi">1</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">sip_send_mwi_to_peer</span><span class="p">(</span><span class="n">peer</span><span class="p">,</span> <span class="mi">0</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">sip_send_mwi_to_peer</span><span class="p">(</span><span class="n">peer</span><span class="p">,</span> <span class="mi">0</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ao2_ref</span><span class="p">(</span><span class="n">peer</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">);</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">The ref counts here should be removed. If we don't already own a ref before entering this function, grabbing one now doesn't help anything.
I've looked at this callback in quite a bit of detail. Because of the way the event is removed during the "clear_peer_mailboxes(peer)" function in the peer's destructor, we are guaranteed this peer will always be valid regardless of any ref counting. The event can not be removed in clear_peer_mailboxes until the event lock is grabbed, if the mwi_event_cb is taking place at that exact moment then the event lock is held in that thread. This syncs the threads up in a way that prevents the peer pointer from existing in the mwi_event_cb after destruction.
This is why the clear_peer_mailboxes(peer) call was moved to the top of the destructor. We don't want to start tearing down peer information if the peer is somehow in the mwi_event_cb function before the event is removed. Note that richard's patch moves the clear_peer_mailboxes(peer) call up as well. So depending on who commits first, this may already be done.
Hope this makes sense.</pre>
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<a href="https://reviewboard.asterisk.org/r/1563/diff/2/?file=21625#file21625line14757" style="color: black; font-weight: bold; text-decoration: underline;">trunk/channels/chan_sip.c</a>
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(Diff revision 2)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static enum check_auth_result register_verify(struct sip_pvt *p, struct ast_sockaddr *addr,</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ao2_ref</span><span class="p">(</span><span class="n">peer</span><span class="p">,</span> <span class="mi">1</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ao2_unlock</span><span class="p">(</span><span class="n">p</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">sip_send_mwi_to_peer</span><span class="p">(</span><span class="n">peer</span><span class="p">,</span> <span class="mi">0</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">sip_send_mwi_to_peer</span><span class="p">(</span><span class="n">peer</span><span class="p">,</span> <span class="mi">0</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ao2_lock</span><span class="p">(</span><span class="n">p</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ao2_ref</span><span class="p">(</span><span class="n">peer</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">);</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I believe the peer already has a ref in this function, so the ref bumping should not be necessary.
Unlocking the pvt however is a good idea, nice catch.</pre>
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<a href="https://reviewboard.asterisk.org/r/1563/diff/2/?file=21625#file21625line25785" style="color: black; font-weight: bold; text-decoration: underline;">trunk/channels/chan_sip.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int get_cached_mwi(struct sip_peer *peer, int *new, int *old)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ao2_unlock</span><span class="p">(</span><span class="n">peer</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_app_inboxcount</span><span class="p">(</span><span class="n">mailbox_str</span><span class="o">-></span><span class="n">str</span><span class="p">,</span> <span class="o">&</span><span class="n">newmsgs</span><span class="p">,</span> <span class="o">&</span><span class="n">oldmsgs</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_app_inboxcount</span><span class="p">(</span><span class="n">mailbox_str</span><span class="o">-></span><span class="n">str</span><span class="p">,</span> <span class="o">&</span><span class="n">newmsgs</span><span class="p">,</span> <span class="o">&</span><span class="n">oldmsgs</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffc5ce" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ao2_lock</span><span class="p">(</span><span class="n">peer</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ao2_lock</span><span class="p">(</span><span class="n">peer</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">In case it wasn't obvious why the peer should be unlocked here, I'll explain.
Getting the voicemail count, depending on what voicemail file system is in use, could require disk access... Blocking during disk access is stupid expensive.</pre>
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<p>- David</p>
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<p>On November 4th, 2011, 11:16 a.m., opticron wrote:</p>
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<div>Review request for Asterisk Developers and David Vossel.</div>
<div>By opticron.</div>
<p style="color: grey;"><i>Updated Nov. 4, 2011, 11:16 a.m.</i></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Fix a locking inversion that causes deadlocks during BLF subscriptions.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Compile</pre>
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<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="https://issues.asterisk.org/jira/browse/ASTERISK-18663">ASTERISK-18663</a>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>trunk/channels/chan_sip.c <span style="color: grey">(342600)</span></li>
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<p><a href="https://reviewboard.asterisk.org/r/1563/diff/" style="margin-left: 3em;">View Diff</a></p>
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