Since kmalloc() will round up the allocation to the next slab size or
page, it will normally return a pointer to a memory block bigger than we
asked for. We can query for the actual size of the allocated block using
ksize() and expand our variable size reservation_list to take advantage
of that extra space.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Christian König <christian.koenig@xxxxxxx>
Cc: Michel Dänzer <michel.daenzer@xxxxxxx>
---
drivers/dma-buf/reservation.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/dma-buf/reservation.c b/drivers/dma-buf/reservation.c
index a6ac2b3a0185..80ecc1283d15 100644
--- a/drivers/dma-buf/reservation.c
+++ b/drivers/dma-buf/reservation.c
@@ -153,7 +153,9 @@ int reservation_object_reserve_shared(struct reservation_object *obj,
RCU_INIT_POINTER(new->shared[j++], fence);
}
new->shared_count = j;
- new->shared_max = max;
+ new->shared_max =
+ (ksize(new) - offsetof(typeof(*new), shared)) /
+ sizeof(*new->shared);
preempt_disable();
write_seqcount_begin(&obj->seq);
@@ -169,7 +171,7 @@ int reservation_object_reserve_shared(struct reservation_object *obj,
return 0;
/* Drop the references to the signaled fences */
- for (i = k; i < new->shared_max; ++i) {
+ for (i = k; i < max; ++i) {
struct dma_fence *fence;
fence = rcu_dereference_protected(new->shared[i],
--
2.22.0
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