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Commit 189e0fb7 authored by Christian König's avatar Christian König Committed by Alex Deucher
Browse files

drm/amdgpu: RCU protected amd_sched_fence_release 



Fences must be freed RCU protected, otherwise the reservation_object_*_rcu()
functions can run into problems.

Signed-off-by: default avatarChristian König <christian.koenig@amd.com>
Reviewed-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent b4413535

drivers/gpu/drm/amd/scheduler/sched_fence.c

+22 −1
Original line number Diff line number Diff line
@@ -84,12 +84,33 @@ static bool amd_sched_fence_enable_signaling(struct fence *f) 
	return true;

}



static void amd_sched_fence_release(struct fence *f)

/**

 * amd_sched_fence_free - free up the fence memory

 *

 * @rcu: RCU callback head

 *

 * Free up the fence memory after the RCU grace period.

 */

static void amd_sched_fence_free(struct rcu_head *rcu)

{

	struct fence *f = container_of(rcu, struct fence, rcu);

	struct amd_sched_fence *fence = to_amd_sched_fence(f);

	kmem_cache_free(sched_fence_slab, fence);

}



/**

 * amd_sched_fence_release - callback that fence can be freed

 *

 * @fence: fence

 *

 * This function is called when the reference count becomes zero.

 * It just RCU schedules freeing up the fence.

 */

static void amd_sched_fence_release(struct fence *f)

{

	call_rcu(&f->rcu, amd_sched_fence_free);

}



const struct fence_ops amd_sched_fence_ops = {

	.get_driver_name = amd_sched_fence_get_driver_name,

	.get_timeline_name = amd_sched_fence_get_timeline_name,