Source of reservation.c - linux-imx - PHYTEC BitBucket (Stash)

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 * @obj: the reservation object
 * @fence: the shared fence to add
 *
 * Add a fence to a shared slot, obj->lock must be held, and
 * reservation_object_reserve_shared() has been called.
 */
void reservation_object_add_shared_fence(struct reservation_object *obj,
                     struct dma_fence *fence)
{
    struct reservation_object_list *fobj;
    unsigned int i;
    unsigned int i, count;
​
    dma_fence_get(fence);
​
    fobj = reservation_object_get_list(obj);
    count = fobj->shared_count;
​
    preempt_disable();
    write_seqcount_begin(&obj->seq);
​
    for (i = 0; i < fobj->shared_count; ++i) {
    for (i = 0; i < count; ++i) {
        struct dma_fence *old_fence;
​
        old_fence = rcu_dereference_protected(fobj->shared[i],
                              reservation_object_held(obj));
        if (old_fence->context == fence->context ||
            dma_fence_is_signaled(old_fence)) {
            dma_fence_put(old_fence);
            goto replace;
        }
    }
​
    BUG_ON(fobj->shared_count >= fobj->shared_max);
    fobj->shared_count++;
    count++;
​
replace:
    /*
     * memory barrier is added by write_seqcount_begin,
     * fobj->shared_count is protected by this lock too
     */
    RCU_INIT_POINTER(fobj->shared[i], fence);
    /* pointer update must be visible before we extend the shared_count */
    smp_store_mb(fobj->shared_count, count);
​
    write_seqcount_end(&obj->seq);
    preempt_enable();
}
EXPORT_SYMBOL(reservation_object_add_shared_fence);
​
/**
 * reservation_object_add_excl_fence - Add an exclusive fence.
 * @obj: the reservation object
 * @fence: the shared fence to add
 *