GangCao 6d5c2d2bd1 io_channel: add the check for the existence of poller_fn
There existing some cases like in our UT code, the
start_poller_fn and stop_poller_fn is not configured.
Add a check here and properly handle these cases.

Change-Id: Iaac83d78547432584f6de0c54e9d2e06b9b35741
Signed-off-by: GangCao <gang.cao@intel.com>
Reviewed-on: https://review.gerrithub.io/392996
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
2018-01-18 13:15:17 -05:00
..
2017-08-02 19:47:35 -04:00
2017-08-02 19:47:35 -04:00