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chan_iax2: Fix bridgecallno deadlock avoidance.

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* Fix bridgecallno deadlock avoidance.  When doing deadlock avoidance, you
need to retest the status of values for each loop to see if you still need
the lock for bridgecallno.

* As a safety check, after acquiring the bridgecallno lock you should
check if iaxs[bridgecallno] is NULL just like the current callno checks.

* Move setting thread->iostate to IAX_IOSTATE_IDLE to after processing any
deferred frames to ensure that the iostate is IDLE when it is placed back
into the idle list.  defer_full_frame() tries to ensure
iax2_process_thread() wakes up to process the frame.
........

Merged revisions 398379 from http://svn.asterisk.org/svn/asterisk/branches/1.8
........

Merged revisions 398380 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/12@398381 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Richard Mudgett
2013-09-05 17:15:55 +00:00
parent a2aa8bf438
commit 5d2ddbb701
1 changed files with 29 additions and 26 deletions
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55
channels/chan_iax2.c
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@@ -831,7 +831,7 @@ struct chan_iax2_pvt {
/*! Status of knowledge of peer ADSI capability */
int peeradsicpe;
/*! Who we are bridged to */
/*! Callno of native bridge peer. (Valid if nonzero) */
unsigned short bridgecallno;
int pingid; /*!< Transmit PING request */
@@ -11221,13 +11221,13 @@ immediatedial:
}
break;
case IAX_COMMAND_TXREJ:
if (iaxs[fr->callno]->bridgecallno) {
while (ast_mutex_trylock(&iaxsl[iaxs[fr->callno]->bridgecallno])) {
DEADLOCK_AVOIDANCE(&iaxsl[fr->callno]);
}
if (!iaxs[fr->callno]) {
break;
}
while (iaxs[fr->callno]
&& iaxs[fr->callno]->bridgecallno
&& ast_mutex_trylock(&iaxsl[iaxs[fr->callno]->bridgecallno])) {
DEADLOCK_AVOIDANCE(&iaxsl[fr->callno]);
}
if (!iaxs[fr->callno]) {
break;
}
iaxs[fr->callno]->transferring = TRANSFER_NONE;
@@ -11238,20 +11238,21 @@ immediatedial:
break;
}
if (iaxs[iaxs[fr->callno]->bridgecallno]->transferring) {
if (iaxs[iaxs[fr->callno]->bridgecallno]
&& iaxs[iaxs[fr->callno]->bridgecallno]->transferring) {
iaxs[iaxs[fr->callno]->bridgecallno]->transferring = TRANSFER_NONE;
send_command(iaxs[iaxs[fr->callno]->bridgecallno], AST_FRAME_IAX, IAX_COMMAND_TXREJ, 0, NULL, 0, -1);
}
ast_mutex_unlock(&iaxsl[iaxs[fr->callno]->bridgecallno]);
break;
case IAX_COMMAND_TXREADY:
if (iaxs[fr->callno]->bridgecallno) {
while (ast_mutex_trylock(&iaxsl[iaxs[fr->callno]->bridgecallno])) {
DEADLOCK_AVOIDANCE(&iaxsl[fr->callno]);
}
if (!iaxs[fr->callno]) {
break;
}
while (iaxs[fr->callno]
&& iaxs[fr->callno]->bridgecallno
&& ast_mutex_trylock(&iaxsl[iaxs[fr->callno]->bridgecallno])) {
DEADLOCK_AVOIDANCE(&iaxsl[fr->callno]);
}
if (!iaxs[fr->callno]) {
break;
}
if (iaxs[fr->callno]->transferring == TRANSFER_BEGIN) {
@@ -11270,8 +11271,9 @@ immediatedial:
break;
}
if (!(iaxs[iaxs[fr->callno]->bridgecallno]->transferring == TRANSFER_READY) &&
!(iaxs[iaxs[fr->callno]->bridgecallno]->transferring == TRANSFER_MREADY)) {
if (!iaxs[iaxs[fr->callno]->bridgecallno]
|| (iaxs[iaxs[fr->callno]->bridgecallno]->transferring != TRANSFER_READY
&& iaxs[iaxs[fr->callno]->bridgecallno]->transferring != TRANSFER_MREADY)) {
ast_mutex_unlock(&iaxsl[iaxs[fr->callno]->bridgecallno]);
break;
}
@@ -11655,11 +11657,10 @@ static void *iax2_process_thread(void *data)
break;
}
if (thread->iostate == IAX_IOSTATE_IDLE)
continue;
/* See what we need to do */
switch (thread->iostate) {
case IAX_IOSTATE_IDLE:
continue;
case IAX_IOSTATE_READY:
thread->actions++;
thread->iostate = IAX_IOSTATE_PROCESSING;
@@ -11672,14 +11673,10 @@ static void *iax2_process_thread(void *data)
#ifdef SCHED_MULTITHREADED
thread->schedfunc(thread->scheddata);
#endif
break;
default:
break;
}
time(&thread->checktime);
thread->iostate = IAX_IOSTATE_IDLE;
#ifdef DEBUG_SCHED_MULTITHREAD
thread->curfunc[0]='\0';
#endif
/* The network thread added us to the active_thread list when we were given
* frames to process, Now that we are done, we must remove ourselves from
@@ -11690,6 +11687,12 @@ static void *iax2_process_thread(void *data)
/* Make sure another frame didn't sneak in there after we thought we were done. */
handle_deferred_full_frames(thread);
time(&thread->checktime);
thread->iostate = IAX_IOSTATE_IDLE;
#ifdef DEBUG_SCHED_MULTITHREAD
thread->curfunc[0]='\0';
#endif
}
/*!