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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
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Merged revisions 378428 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@378429 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Richard Mudgett 2013-01-03 17:48:14 +00:00
parent 7739ed9989
commit 11571714fe
1 changed files with 11 additions and 12 deletions
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23
channels/chan_agent.c
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@ -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;
}