[Asterisk-code-review] res_pjsip_refer: Always serialize calls to refer_progress_notify (asterisk[16])

[George Joseph]

Hello Friendly Automation, Richard Mudgett, 

I'd like you to reexamine a change. Please visit

    https://gerrit.asterisk.org/c/asterisk/+/15400

to look at the new patch set (#4).

Change subject: res_pjsip_refer: Always serialize calls to refer_progress_notify
......................................................................

res_pjsip_refer: Always serialize calls to refer_progress_notify

refer_progress_notify wasn't always being called from the progress
serializer.  This could allow clearing notification->progress->sub
in one thread while another was trying to use it.

* Instances where refer_progress_notify was being called in-line,
  have been changed to use ast_sip_push_task_wait_serializer()
  which runs the callback in-line if it's already called from the
  progress serializer and pushes it to the progress serializer
  with a wait if it isn't.

Change-Id: Idcf1934c4e873f2c82e2d106f8d9f040caf9fa1e
---
M res/res_pjsip_refer.c
1 file changed, 32 insertions(+), 10 deletions(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/00/15400/4
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Gerrit-Project: asterisk
Gerrit-Branch: 16
Gerrit-Change-Id: Idcf1934c4e873f2c82e2d106f8d9f040caf9fa1e
Gerrit-Change-Number: 15400
Gerrit-PatchSet: 4
Gerrit-Owner: George Joseph <gjoseph at digium.com>
Gerrit-Reviewer: Friendly Automation
Gerrit-Reviewer: Richard Mudgett <rmudgett at digium.com>
Gerrit-MessageType: newpatchset
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