struct ib_ucontext *ib_uverbs_get_ucontext_file(struct ib_uverbs_file *ufile)
{
	/*
	 * We do not hold the hw_destroy_rwsem lock for this flow, instead
	 * srcu is used. It does not matter if someone races this with
	 * get_context, we get NULL or valid ucontext.
	 */
	struct ib_ucontext *ucontext = smp_load_acquire(&ufile->ucontext);

	if (!srcu_dereference(ufile->device->ib_dev,
			      &ufile->device->disassociate_srcu))
		return ERR_PTR(-EIO);

	if (!ucontext)
		return ERR_PTR(-EINVAL);

	return ucontext;
}

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.