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Diffstat (limited to 'drivers/dma-buf/dma-resv.c')
| -rw-r--r-- | drivers/dma-buf/dma-resv.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c index 87f5d82d992a..3964df438505 100644 --- a/drivers/dma-buf/dma-resv.c +++ b/drivers/dma-buf/dma-resv.c @@ -208,6 +208,26 @@ int dma_resv_reserve_shared(struct dma_resv *obj, unsigned int num_fences) } EXPORT_SYMBOL(dma_resv_reserve_shared); +#ifdef CONFIG_DEBUG_MUTEXES +/** + * dma_resv_reset_shared_max - reset shared fences for debugging + * @obj: the dma_resv object to reset + * + * Reset the number of pre-reserved shared slots to test that drivers do + * correct slot allocation using dma_resv_reserve_shared(). See also + * &dma_resv_list.shared_max. + */ +void dma_resv_reset_shared_max(struct dma_resv *obj) +{ + /* Test shared fence slot reservation */ + if (rcu_access_pointer(obj->fence)) { + struct dma_resv_list *fence = dma_resv_get_list(obj); + + fence->shared_max = fence->shared_count; + } +} +#endif + /** * dma_resv_add_shared_fence - Add a fence to a shared slot * @obj: the reservation object |