Merged revisions 238635 via svnmerge from

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

........
  r238635 | dvossel | 2010-01-08 13:39:30 -0600 (Fri, 08 Jan 2010) | 22 lines
  
  fixes AUDIOHOOK_INHERIT regression
  
  During the process of removing an audiohook from one channel
  and attaching it to another the audiohook's status is updated
  to DONE and then back to whatever it was previously.  Typically
  updating the status after setting it to DONE is not a good idea
  because DONE can trigger unrecoverable audiohook destruction
  events... because of this a conditional check was added to
  audiohook_update_status to explicitly prevent the audiohook
  from ever changing after being set to DONE.  It was this check
  that prevented audiohook inherit from work properly though.
  
  Now ast_audiohook_move_by_source is treated as a special exception,
  as the audiohook must be returned to its previous status after
  attaching it to the new channel.  This is only a safe operation
  because the audiohook's lock is held the entire time, otherwise
  this could cause trouble.
  
  (closes issue #16522)
  Reported by: corruptor
........


git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.6.2@238637 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 10 insertions, 1 deletions

diff --git a/main/audiohook.c b/main/audiohook.c
index 5d4feeaaf..b0fb48ad6 100644
--- a/main/audiohook.c
+++ b/main/audiohook.c
@@ -361,7 +361,11 @@ int ast_audiohook_attach(struct ast_channel *chan, struct ast_audiohook *audioho
 /*! \brief Update audiohook's status
  * \param audiohook status enum
  * \param audiohook Audiohook structure
+ *
+ * \note once status is updated to DONE, this function can not be used to set the
+ * status back to any other setting.  Setting DONE effectively locks the status as such.
  */
+
 void ast_audiohook_update_status(struct ast_audiohook *audiohook, enum ast_audiohook_status status)
 {
 	ast_audiohook_lock(audiohook);
@@ -458,6 +462,7 @@ static struct ast_audiohook *find_audiohook_by_source(struct ast_audiohook_list
 void ast_audiohook_move_by_source(struct ast_channel *old_chan, struct ast_channel *new_chan, const char *source)
 {
 	struct ast_audiohook *audiohook;
+	enum ast_audiohook_status oldstatus;
 
 	if (!old_chan->audiohooks || !(audiohook = find_audiohook_by_source(old_chan->audiohooks, source))) {
 		return;
@@ -466,11 +471,15 @@ void ast_audiohook_move_by_source(struct ast_channel *old_chan, struct ast_chann
 	/* By locking both channels and the audiohook, we can assure that
 	 * another thread will not have a chance to read the audiohook's status
 	 * as done, even though ast_audiohook_remove signals the trigger
-	 * condition
+	 * condition.
 	 */
 	ast_audiohook_lock(audiohook);
+	oldstatus = audiohook->status;
+
 	ast_audiohook_remove(old_chan, audiohook);
 	ast_audiohook_attach(new_chan, audiohook);
+
+	audiohook->status = oldstatus;
 	ast_audiohook_unlock(audiohook);
 }