Merged revisions 222463 via svnmerge from

https://origsvn.digium.com/svn/asterisk/trunk

................
  r222463 | jpeeler | 2009-10-06 18:56:01 -0500 (Tue, 06 Oct 2009) | 14 lines
  
  Merged revisions 222462 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.4
  
  ........
    r222462 | jpeeler | 2009-10-06 18:51:19 -0500 (Tue, 06 Oct 2009) | 8 lines
    
    Add missing unlock(s) in dahdi_read
    
    (two cases in trunk)
    
    (closes issue #15683)
    Reported by: alecdavis
  ........
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.1@222465 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_dahdi.c

@@ -5679,7 +5679,10 @@ static struct ast_frame  *dahdi_read(struct ast_channel *ast)
 		return NULL;
 	}
 	
-	if ((p->radio || (p->oprmode < 0)) && p->inalarm) return NULL;
+	if ((p->radio || (p->oprmode < 0)) && p->inalarm) {
+		ast_mutex_unlock(&p->lock);
+		return NULL;
+	}
 
 	p->subs[idx].f.frametype = AST_FRAME_NULL;
 	p->subs[idx].f.datalen = 0;