minor logic simplification in get_sip_pvt_byid_locked()

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@29266 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 397aa2befabfc002d5a04f0733bf55af879db33a..648924a2315fc0d120ebdc621471af6f7140cc8c 100644 (file)
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -7100,10 +7100,10 @@ static int get_destination(struct sip_pvt *p, struct sip_request *oreq)
        - This means that in some transactions, totag needs to be their tag :-)
          depending upon the direction
 */
-static struct sip_pvt *get_sip_pvt_byid_locked(char *callid, char *totag, char *fromtag) 
+static struct sip_pvt *get_sip_pvt_byid_locked(const char *callid, const char *totag, const char *fromtag) 
 {
-       struct sip_pvt *sip_pvt_ptr = NULL;
-       
+       struct sip_pvt *sip_pvt_ptr;
+
        /* Search interfaces and find the match */
        ast_mutex_lock(&iflock);
 
@@ -7131,16 +7131,15 @@ static struct sip_pvt *get_sip_pvt_byid_locked(char *callid, char *totag, char *
                        }
 
                        if (option_debug > 3 && totag)                           
-                               ast_log(LOG_DEBUG, "Matched %s call - their tag is %s Our tag is %s\n", ast_test_flag(&sip_pvt_ptr->flags[0], SIP_OUTGOING) ? "OUTGOING": "INCOMING", sip_pvt_ptr->theirtag, sip_pvt_ptr->tag);
-
-                       if (sip_pvt_ptr->owner) {
-                               while(ast_channel_trylock(sip_pvt_ptr->owner)) {
-                                       ast_mutex_unlock(&sip_pvt_ptr->lock);
-                                       usleep(1);
-                                       ast_mutex_lock(&sip_pvt_ptr->lock);
-                                       if (!sip_pvt_ptr->owner)
-                                               break;
-                               }
+                               ast_log(LOG_DEBUG, "Matched %s call - their tag is %s Our tag is %s\n",
+                                       ast_test_flag(&sip_pvt_ptr->flags[0], SIP_OUTGOING) ? "OUTGOING": "INCOMING",
+                                       sip_pvt_ptr->theirtag, sip_pvt_ptr->tag);
+
+                       /* deadlock avoidance... */
+                       while (sip_pvt_ptr->owner && ast_mutex_trylock(&sip_pvt_ptr->owner->lock)) {
+                               ast_mutex_unlock(&sip_pvt_ptr->lock);
+                               usleep(1);
+                               ast_mutex_lock(&sip_pvt_ptr->lock);
                        }
                        break;
                }