Jian Jun Chen f1e87f60fc dm: vrtc: use signalfd to poll signal from timer ...

In the current implementation sigev_notify is configured as
SIGEV_THREAD. When timer expires an async thread is created and
the registered timer callback is called in the context of this
thread. vrtc_update_timer will access the global data vrtc. There
is a race condition that vrtc is freed when deinit and then a timer
expires. In this case vrtc_update_timer will access a freed buffer
which causes problem such as heap corruption and segment fault.

In this patch signal model is used when timer is created. The signal
is masked and a signalfd is used to poll on it with mevent. This avoids
the race condition.

Signed-off-by: Jian Jun Chen <jian.jun.chen@intel.com>
Acked-by: Yin Fengwei <fengwei.yin@intel.com>
Tracked-On: #1185

2018-09-11 10:50:16 +08:00

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