Commit 99fe21a7 authored Oct 04, 2018 by Christian König

dma-buf: test shared slot allocation when mutex debugging is active



Set shared_max to the number of shared fences right before we release
the lock.

This way every attempt to add a shared fence without previously
reserving a slot will cause an error.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Acked-by: Junwei Zhang <Jerry.Zhang@amd.com>
Link: https://patchwork.kernel.org/patch/10626147/

parent ca05359f

include/linux/reservation.h

+5 −0

Original line number	Diff line number	Diff line
		@@ -214,6 +214,11 @@ reservation_object_trylock(struct reservation_object *obj)
		static inline void
		reservation_object_unlock(struct reservation_object *obj)
		{
		#ifdef CONFIG_DEBUG_MUTEXES
		/* Test shared fence slot reservation */
		if (obj->fence)
		obj->fence->shared_max = obj->fence->shared_count;
		#endif
		ww_mutex_unlock(&obj->lock);
		}