From 217d6f80ea329fd064a5a49edbbbaec49a0b4528 Mon Sep 17 00:00:00 2001
From: Russell Bryant <russell@russellbryant.com>
Date: Tue, 19 Jun 2007 16:46:43 +0000
Subject: [PATCH] Blocked revisions 69990 via svnmerge

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r69990 | russell | 2007-06-19 11:45:37 -0500 (Tue, 19 Jun 2007) | 12 lines

Backport fix for crashes related to subscriptions from 1.4 ...

Fix a crash that could occur when handing device state changes.
When the state of a device changes, the device state thread tells the extension
state handling code that it changed.  Then, the extension state code calls the
callback in chan_sip so that it can update subscriptions to that extension.
A pointer to a sip_pvt structure is passed to this function as the call which
needs a NOTIFY sent.  However, there was no locking done to ensure that the pvt
struct didn't disappear during this process.
(issue #9946, reported by tdonahue, patch by me, patch updated to trunk to use
 the sip_pvt lock wrappers by eliel)

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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@69991 65c4cc65-6c06-0410-ace0-fbb531ad65f3