From a35f2f34b5b4ea079abefb644ac4f828c30e9a5d Mon Sep 17 00:00:00 2001 From: Christian König Date: Wed, 10 Jan 2018 13:53:41 +0100 Subject: dma-buf: make returning the exclusive fence optional MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Change reservation_object_get_fences_rcu to make the exclusive fence pointer optional. If not specified the exclusive fence is put into the fence array as well. This is helpful for a couple of cases where we need all fences in a single array. Reviewed-by: Chunming Zhou Acked-by: Daniel Vetter Signed-off-by: Christian König Signed-off-by: Alex Deucher Link: https://patchwork.freedesktop.org/patch/msgid/20180110125341.3618-1-christian.koenig@amd.com --- drivers/dma-buf/reservation.c | 31 ++++++++++++++++++++++--------- 1 file changed, 22 insertions(+), 9 deletions(-) (limited to 'drivers/dma-buf') diff --git a/drivers/dma-buf/reservation.c b/drivers/dma-buf/reservation.c index b759a569b7b8..461afa9febd4 100644 --- a/drivers/dma-buf/reservation.c +++ b/drivers/dma-buf/reservation.c @@ -374,8 +374,9 @@ EXPORT_SYMBOL(reservation_object_copy_fences); * @pshared: the array of shared fence ptrs returned (array is krealloc'd to * the required size, and must be freed by caller) * - * RETURNS - * Zero or -errno + * Retrieve all fences from the reservation object. If the pointer for the + * exclusive fence is not specified the fence is put into the array of the + * shared fences as well. Returns either zero or -ENOMEM. */ int reservation_object_get_fences_rcu(struct reservation_object *obj, struct dma_fence **pfence_excl, @@ -389,8 +390,8 @@ int reservation_object_get_fences_rcu(struct reservation_object *obj, do { struct reservation_object_list *fobj; - unsigned seq; - unsigned int i; + unsigned int i, seq; + size_t sz = 0; shared_count = i = 0; @@ -402,9 +403,14 @@ int reservation_object_get_fences_rcu(struct reservation_object *obj, goto unlock; fobj = rcu_dereference(obj->fence); - if (fobj) { + if (fobj) + sz += sizeof(*shared) * fobj->shared_max; + + if (!pfence_excl && fence_excl) + sz += sizeof(*shared); + + if (sz) { struct dma_fence **nshared; - size_t sz = sizeof(*shared) * fobj->shared_max; nshared = krealloc(shared, sz, GFP_NOWAIT | __GFP_NOWARN); @@ -420,13 +426,19 @@ int reservation_object_get_fences_rcu(struct reservation_object *obj, break; } shared = nshared; - shared_count = fobj->shared_count; - + shared_count = fobj ? fobj->shared_count : 0; for (i = 0; i < shared_count; ++i) { shared[i] = rcu_dereference(fobj->shared[i]); if (!dma_fence_get_rcu(shared[i])) break; } + + if (!pfence_excl && fence_excl) { + shared[i] = fence_excl; + fence_excl = NULL; + ++i; + ++shared_count; + } } if (i != shared_count || read_seqcount_retry(&obj->seq, seq)) { @@ -448,7 +460,8 @@ unlock: *pshared_count = shared_count; *pshared = shared; - *pfence_excl = fence_excl; + if (pfence_excl) + *pfence_excl = fence_excl; return ret; } -- cgit v1.2.3