Merged revisions 378429 via svnmerge from

file:///srv/subversion/repos/asterisk/trunk

................
  r378429 | rmudgett | 2013-01-03 11:48:14 -0600 (Thu, 03 Jan 2013) | 10 lines

  chan_agent: Fix agent_indicate() locking.

  Avoid deadlock potential with local channels and simplify the locking.
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  Merged revisions 378427 from http://svn.asterisk.org/svn/asterisk/branches/1.8
  ........

  Merged revisions 378428 from http://svn.asterisk.org/svn/asterisk/branches/11
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git-svn-id: https://origsvn.digium.com/svn/asterisk/team/mmichelson/threadpool@378436 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/channels/chan_agent.c b/channels/chan_agent.c
index a9a70d01d9cfb8c739aa812b61ccd92a1f5efdf9..cab3ede4be16e76daf75a7296ccd2429421e82dd 100644 (file)
--- a/channels/chan_agent.c
+++ b/channels/chan_agent.c
@@ -784,22 +784,21 @@ static int agent_indicate(struct ast_channel *ast, int condition, const void *da
 {
        struct agent_pvt *p = ast_channel_tech_pvt(ast);
        int res = -1;
+
        ast_mutex_lock(&p->lock);
        if (p->chan && !ast_check_hangup(p->chan)) {
-               while (ast_channel_trylock(p->chan)) {
-                       if ((res = ast_channel_unlock(ast))) {
-                               ast_log(LOG_ERROR, "chan_agent bug! Channel was not locked upon entry to agent_indicate: %s\n", res > 0 ? strerror(res) : "Bad ao2obj data");
-                               ast_mutex_unlock(&p->lock);
-                               return -1;
-                       }
-                       usleep(1);
-                       ast_channel_lock(ast);
-               }
-               res = ast_channel_tech(p->chan)->indicate ? ast_channel_tech(p->chan)->indicate(p->chan, condition, data, datalen) : -1;
+               ast_channel_unlock(ast);
+               ast_channel_lock(p->chan);
+               res = ast_channel_tech(p->chan)->indicate
+                       ? ast_channel_tech(p->chan)->indicate(p->chan, condition, data, datalen)
+                       : -1;
                ast_channel_unlock(p->chan);
-       } else
+               ast_mutex_unlock(&p->lock);
+               ast_channel_lock(ast);
+       } else {
+               ast_mutex_unlock(&p->lock);
                res = 0;
-       ast_mutex_unlock(&p->lock);
+       }
        return res;
 }