Commit 5f914600 authored Jul 05, 2015 by Tarun Karra

msm: kgsl: Add barrier to read preemption state correctly



Preemption state gives us the current state of preemption.
This state is updated in different points in the driver.
Without a barrier we are reading stale values, add a barrier
to read the most recent updated preemption state.

Change-Id: I1e52b2c3c6cd8aec5252c6e750a7012c68ab26dd
Signed-off-by: Tarun Karra <tkarra@codeaurora.org>

parent 55bc7ff0

drivers/gpu/msm/adreno_a5xx.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -3155,6 +3155,12 @@ static void a5xx_preemption_schedule(

		mutex_lock(&device->mutex);

		/*
		* This barrier is needed for most updated preemption_state
		* to be read.
		*/
		smp_mb();

		if (KGSL_STATE_ACTIVE == device->state)
		FOR_EACH_RINGBUFFER(adreno_dev, rb, i)
		rb->rptr = adreno_get_rptr(rb);