Use ast_channel_lock_both() where it was inlined before.

The CHANNEL_DEADLOCK_AVOIDANCE() feature of preserving where the channel
lock was originally obtained is overkill where ast_channel_lock_both() was
inlined.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@362888 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_dial.c

@@ -902,15 +902,13 @@ static void do_forward(struct chanlist *o,
 	} else {
 		struct ast_party_redirecting redirecting;
 
+		ast_channel_lock_both(c, in);
+
 		if (single_caller_bored && CAN_EARLY_BRIDGE(peerflags, c, in)) {
 			ast_rtp_instance_early_bridge_make_compatible(c, in);
 		}
 
 		ast_channel_set_redirecting(c, ast_channel_redirecting(original), NULL);
-		ast_channel_lock(c);
-		while (ast_channel_trylock(in)) {
-			CHANNEL_DEADLOCK_AVOIDANCE(c);
-		}
 		if (!ast_channel_redirecting(c)->from.number.valid
 			|| ast_strlen_zero(ast_channel_redirecting(c)->from.number.str)) {
 			/*
@@ -986,10 +984,7 @@ static void do_forward(struct chanlist *o,
 			c = o->chan = NULL;
 			num->nochan++;
 		} else {
-			ast_channel_lock(c);
+			ast_channel_lock_both(c, in);
-			while (ast_channel_trylock(in)) {
-				CHANNEL_DEADLOCK_AVOIDANCE(c);
-			}
 			senddialevent(in, c, stuff);
 			ast_channel_unlock(in);
 			ast_channel_unlock(c);
@@ -2295,10 +2290,8 @@ static int dial_exec_full(struct ast_channel *chan, const char *data, struct ast
 		}
 		pbx_builtin_setvar_helper(tc, "DIALEDPEERNUMBER", numsubst);
 
-		ast_channel_lock(tc);
+		ast_channel_lock_both(tc, chan);
-		while (ast_channel_trylock(chan)) {
+
-			CHANNEL_DEADLOCK_AVOIDANCE(tc);
-		}
 		/* Setup outgoing SDP to match incoming one */
 		if (!outgoing && !rest && CAN_EARLY_BRIDGE(peerflags, chan, tc)) {
 			ast_rtp_instance_early_bridge_make_compatible(tc, chan);

channels/chan_dahdi.c

@@ -7302,10 +7302,7 @@ static enum ast_bridge_result dahdi_bridge(struct ast_channel *c0, struct ast_ch
 	if (flags & (AST_BRIDGE_DTMF_CHANNEL_0 | AST_BRIDGE_DTMF_CHANNEL_1))
 		return AST_BRIDGE_FAILED_NOWARN;
 
-	ast_channel_lock(c0);
+	ast_channel_lock_both(c0, c1);
-	while (ast_channel_trylock(c1)) {
-		CHANNEL_DEADLOCK_AVOIDANCE(c0);
-	}
 
 	p0 = ast_channel_tech_pvt(c0);
 	p1 = ast_channel_tech_pvt(c1);
@@ -7513,10 +7510,7 @@ static enum ast_bridge_result dahdi_bridge(struct ast_channel *c0, struct ast_ch
 		/* Here's our main loop...  Start by locking things, looking for private parts,
 		   and then balking if anything is wrong */
 
-		ast_channel_lock(c0);
+		ast_channel_lock_both(c0, c1);
-		while (ast_channel_trylock(c1)) {
-			CHANNEL_DEADLOCK_AVOIDANCE(c0);
-		}
 
 		p0 = ast_channel_tech_pvt(c0);
 		p1 = ast_channel_tech_pvt(c1);

channels/chan_local.c

@@ -194,10 +194,7 @@ static void awesome_locking(struct local_pvt *p, struct ast_channel **outchan, s
 			ao2_lock(p);
 		} else {
 			/* lock both channels first, then get the pvt lock */
-			ast_channel_lock(chan);
+			ast_channel_lock_both(chan, owner);
-			while (ast_channel_trylock(owner)) {
-				CHANNEL_DEADLOCK_AVOIDANCE(chan);
-			}
 			ao2_lock(p);
 		}
 

channels/chan_misdn.c

@@ -8560,10 +8560,7 @@ static int misdn_attempt_transfer(struct chan_list *active_ch, struct chan_list
 		return -1;
 	}
 
-	ast_channel_lock(held_ch->ast);
+	ast_channel_lock_both(held_ch->ast, active_ch->ast);
-	while (ast_channel_trylock(active_ch->ast)) {
-		CHANNEL_DEADLOCK_AVOIDANCE(held_ch->ast);
-	}
 
 	transferee = ast_bridged_channel(held_ch->ast);
 	if (!transferee) {

main/rtp_engine.c

@@ -1452,12 +1452,7 @@ void ast_rtp_instance_early_bridge_make_compatible(struct ast_channel *c0, struc
 	int res = 0;
 
 	/* Lock both channels so we can look for the glue that binds them together */
-	ast_channel_lock(c0);
+	ast_channel_lock_both(c0, c1);
-	while (ast_channel_trylock(c1)) {
-		ast_channel_unlock(c0);
-		usleep(1);
-		ast_channel_lock(c0);
-	}
 
 	if (!cap1 || !cap0) {
 		goto done;