Hold owner lock when changing codecs

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@2529 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_iax2.c

@@ -4948,6 +4948,15 @@ retryowner:
 						iaxs[fr.callno]->owner->nativeformats = iaxs[fr.callno]->peerformat;
 						if (option_verbose > 2)
 							ast_verbose(VERBOSE_PREFIX_3 "Format for call is %s\n", ast_getformatname(iaxs[fr.callno]->owner->nativeformats));
+retryowner2:
+						if (ast_mutex_trylock(&iaxs[fr.callno]->owner->lock)) {
+							ast_mutex_unlock(&iaxsl[fr.callno]);
+							usleep(1);
+							ast_mutex_lock(&iaxsl[fr.callno]);
+							if (iaxs[fr.callno] && iaxs[fr.callno]->owner) goto retryowner2;
+						}
+						
+						if (iaxs[fr.callno] && iaxs[fr.callno]->owner) {
 							/* Setup read/write formats properly. */
 							if (iaxs[fr.callno]->owner->writeformat)
 								ast_set_write_format(iaxs[fr.callno]->owner, iaxs[fr.callno]->owner->writeformat);	
@@ -4955,6 +4964,7 @@ retryowner:
 								ast_set_read_format(iaxs[fr.callno]->owner, iaxs[fr.callno]->owner->readformat);	
 						}
 					}
+				}
 				ast_mutex_lock(&dpcache_lock);
 				dp = iaxs[fr.callno]->dpentries;
 				while(dp) {